Pub Date : 2026-01-19DOI: 10.1016/j.jlumin.2026.121761
Shun Li , Bin Duan , Changchun Ding , Daobin Zhu , Keyu Guo , Yuxiang Wu , Wei Jin , Tong Liu , Rangrang Fan , Junshan Hu
Er3+-doped Bi2O3 phosphors were successfully prepared by means of high-temperature solid-state methods. Excitation with a 980 nm near-infrared laser, Bi2O3: Er3+ phosphors exhibit green emission at 550 nm and red emission at 662 nm. As the Er3+ doping concentration increases, the crystal structure transforms from monoclinic to tetragonal. Typically, when a compound undergoes phase transformation, the luminescence properties of rare-earth ions do not change significantly. However, after the transition to the tetragonal phase, the emission color shifts from green to intense red. Specifically, Bi2O3: 0.06Er3+ achieves a red-to-green intensity ratio of 24.8. In monoclinic Bi2O3: 0.02Er3+, the primary upconversion pathway is Er3+ (4I11/2) → Er3+ (4F7/2), whereas in tetragonal Bi2O3: 0.06Er3+, the main excitation route shifts to Er3+ (4I13/2) → Er3+ (4F9/2). At 298 K, the maximum relative sensitivity of Bi2O3: 0.02Er3+ is 1.39 % K−1, while the maximum relative sensitivity of the tetragonal Bi2O3: 0.06Er3+ reaches 1.96 % K−1, demonstrating excellent potential for optical temperature sensing applications. The proposed phase modulation mechanism and optical thermometry method open up a new way for emission color tuning of upconversion luminescence theory and optical thermometry.
{"title":"Modulating upconversion luminescence of Bi2O3:Er3+ by phase transition for optical thermometry","authors":"Shun Li , Bin Duan , Changchun Ding , Daobin Zhu , Keyu Guo , Yuxiang Wu , Wei Jin , Tong Liu , Rangrang Fan , Junshan Hu","doi":"10.1016/j.jlumin.2026.121761","DOIUrl":"10.1016/j.jlumin.2026.121761","url":null,"abstract":"<div><div>Er<sup>3+</sup>-doped Bi<sub>2</sub>O<sub>3</sub> phosphors were successfully prepared by means of high-temperature solid-state methods. Excitation with a 980 nm near-infrared laser, Bi<sub>2</sub>O<sub>3</sub>: Er<sup>3+</sup> phosphors exhibit green emission at 550 nm and red emission at 662 nm. As the Er<sup>3+</sup> doping concentration increases, the crystal structure transforms from monoclinic to tetragonal. Typically, when a compound undergoes phase transformation, the luminescence properties of rare-earth ions do not change significantly. However, after the transition to the tetragonal phase, the emission color shifts from green to intense red. Specifically, Bi<sub>2</sub>O<sub>3</sub>: 0.06Er<sup>3+</sup> achieves a red-to-green intensity ratio of 24.8. In monoclinic Bi<sub>2</sub>O<sub>3</sub>: 0.02Er<sup>3+</sup>, the primary upconversion pathway is Er<sup>3+</sup> (<sup>4</sup>I<sub>11/2</sub>) → Er<sup>3+</sup> (<sup>4</sup>F<sub>7/2</sub>), whereas in tetragonal Bi<sub>2</sub>O<sub>3</sub>: 0.06Er<sup>3+</sup>, the main excitation route shifts to Er<sup>3+</sup> (<sup>4</sup>I<sub>13/2</sub>) → Er<sup>3+</sup> (<sup>4</sup>F<sub>9/2</sub>). At 298 K, the maximum relative sensitivity of Bi<sub>2</sub>O<sub>3</sub>: 0.02Er<sup>3+</sup> is 1.39 % K<sup>−1</sup>, while the maximum relative sensitivity of the tetragonal Bi<sub>2</sub>O<sub>3</sub>: 0.06Er<sup>3+</sup> reaches 1.96 % K<sup>−1</sup>, demonstrating excellent potential for optical temperature sensing applications. The proposed phase modulation mechanism and optical thermometry method open up a new way for emission color tuning of upconversion luminescence theory and optical thermometry.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121761"},"PeriodicalIF":3.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-19DOI: 10.1016/j.jlumin.2026.121764
Trupti D. Solanky , Anas D. Fazal , Abhishek R. Patel , Monalisha Nayak , Om Prakash , Rajamouli Boddula , Prashanth K. Koochana , Sumit Kumar , Sumit Kumar Panja
The present work investigates the ground and excited state aggregation behaviour of two pyrene-based push-pull systems (Pyr-DC: 2-(pyren-1-ylmethylene)malononitrile and Ind-Pyr: 2-(pyren-1-ylmethylene)-1H-indene-1,3(2H)-dione) in various solvents; polar-to-nonpolar solvents. UV–Vis absorption spectra exhibit a broadened low-energy band (400–500 nm), suggesting aggregate formation in water. In aqueous and n-hexane, a unique emission band observed ∼650–750 nm attributeJ-type aggregated species for Pyr-DC and Ind-Pyr. First time, NIR J-type aggregation of these pyrene derivative is observed in solvents. The dipolar character of the Pyr-DC and Ind-Pyr plays a crucial role in facilitating this aggregation process in aqueous and n-hexane. Field Emission Scanning Electron Microscopy (FESEM) analysis is performed to investigate aggregation morphology of these Pyr-DC and Ind-Pyr and observe that pristine Pyr-DC and Ind-Pyr reveal relatively undefined, fused globular structures, indicating amorphous aggregation and the absence of significant long-range order whereas H2O treated Pyr-DC and Ind-Pyr exhibits a more organized morphology with distinct granular aggregates with increased inter-particle connectivity and partial elongation.
To gain a deeper understanding of the molecular properties of Pyr-DC and Ind-Pyr and their behavior in the various solvents, density functional theory based quantum chemicals are perform to support the experimental observations. Quantum Theory of Atoms in Molecules (QTAIM) analysis is used to get more insights into the electron density topology and the nature of non-covalent interactions and other molecular properties related to structure-spectroscopy.
{"title":"Near-infrared J-type excimer emission in pyrene-based Push–Pull systems: Role of solvent environment","authors":"Trupti D. Solanky , Anas D. Fazal , Abhishek R. Patel , Monalisha Nayak , Om Prakash , Rajamouli Boddula , Prashanth K. Koochana , Sumit Kumar , Sumit Kumar Panja","doi":"10.1016/j.jlumin.2026.121764","DOIUrl":"10.1016/j.jlumin.2026.121764","url":null,"abstract":"<div><div>The present work investigates the ground and excited state aggregation behaviour of two pyrene-based push-pull systems (<strong>Pyr-DC</strong>: 2-(pyren-1-ylmethylene)malononitrile and <strong>Ind-Pyr:</strong> 2-(pyren-1-ylmethylene)-1<em>H</em>-indene-1,3(2<em>H</em>)-dione) in various solvents; polar-to-nonpolar solvents. UV–Vis absorption spectra exhibit a broadened low-energy band (400–500 nm), suggesting aggregate formation in water. In aqueous and n-hexane, a unique emission band observed ∼650–750 nm attribute<em>J</em>-type aggregated species for <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong>. First time, NIR J-type aggregation of these pyrene derivative is observed in solvents. The dipolar character of the <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong> plays a crucial role in facilitating this aggregation process in aqueous and n-hexane. Field Emission Scanning Electron Microscopy (FESEM) analysis is performed to investigate aggregation morphology of these <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong> and observe that pristine <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong> reveal relatively undefined, fused globular structures, indicating amorphous aggregation and the absence of significant long-range order whereas H<sub>2</sub>O treated <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong> exhibits a more organized morphology with distinct granular aggregates with increased inter-particle connectivity and partial elongation.</div><div>To gain a deeper understanding of the molecular properties of <strong>Pyr-DC</strong> and <strong>Ind-Pyr</strong> and their behavior in the various solvents, density functional theory based quantum chemicals are perform to support the experimental observations. Quantum Theory of Atoms in Molecules (QTAIM) analysis is used to get more insights into the electron density topology and the nature of non-covalent interactions and other molecular properties related to structure-spectroscopy.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121764"},"PeriodicalIF":3.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-18DOI: 10.1016/j.jlumin.2026.121756
Hongxu Wang , Pancheng Feng , Qian Tao , Hongquan Fu , Zizhuan Zhang , Bin Wang , Ying Zhang
Mechanochromic materials exhibiting outstanding reversibility and high contrast have garnered significant attention for applications across numerous fields. We strategically designed and synthesized two novel tetraphenylethylene-modified difluoroboron-β-diketone acid complexes TPE-Nap and TPE-Qui, modifying the N-substituents, to clarify the impact of the ring group transformations on aggregation behaviour and emission properties. The electronic effect of nitrogen substitution groups plays a key role in regulating the emission and the aggregation mode, demonstrating a strong correlation with Hammett constants. It demonstrates precise control over ring group effects on aggregation modes and emission behaviour, elucidates the underlying regulatory. This work demonstrates precise control over ring group effects on aggregation modes and emission behaviour, elucidates the underlying regulatory mechanism, and underscores its significance for tailoring advanced functional materials.
{"title":"The micro-modified β-diketone boron derivatives based on tetraphenylethylene possess aggregation-induced emission and high-contrast mechanochromism","authors":"Hongxu Wang , Pancheng Feng , Qian Tao , Hongquan Fu , Zizhuan Zhang , Bin Wang , Ying Zhang","doi":"10.1016/j.jlumin.2026.121756","DOIUrl":"10.1016/j.jlumin.2026.121756","url":null,"abstract":"<div><div>Mechanochromic materials exhibiting outstanding reversibility and high contrast have garnered significant attention for applications across numerous fields. We strategically designed and synthesized two novel tetraphenylethylene-modified difluoroboron-β-diketone acid complexes <strong>TPE-Nap</strong> and <strong>TPE-Qui</strong>, modifying the N-substituents, to clarify the impact of the ring group transformations on aggregation behaviour and emission properties. The electronic effect of nitrogen substitution groups plays a key role in regulating the emission and the aggregation mode, demonstrating a strong correlation with Hammett constants. It demonstrates precise control over ring group effects on aggregation modes and emission behaviour, elucidates the underlying regulatory. This work demonstrates precise control over ring group effects on aggregation modes and emission behaviour, elucidates the underlying regulatory mechanism, and underscores its significance for tailoring advanced functional materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121756"},"PeriodicalIF":3.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-13DOI: 10.1016/j.jlumin.2026.121754
Anuda Bibi, Muhammad Usman, Shazma Ali, Aiman Fatima, Haseena Noor
The optoelectronic performance of an AlGaN ultraviolet-C (UV-C) nanowire LED emitting at 265 nm is numerically analyzed by incorporating a step-graded superlattice last quantum barrier (SGSLLQB). A SGSLLQB is employed in place of a conventional last quantum barrier, which lowers the energy barrier for holes and enhances the electron confining capability of wells, leading to stronger radiative recombination. Consequently, the optical output power was enhanced by 37 % and internal quantum efficiency increased from 53 % for a conventional last quantum barrier to 63 % for the SGSLLQB. These results demonstrate that the SGSLLQB is an effective method to enhance the performance of AlGaN UV-C nanowire LEDs without changing the overall device design. This work highlights the role of barrier engineering in developing high-efficiency UV-C nanowire LEDs for future optoelectronic applications.
采用阶跃渐变超晶格末量子势垒（SGSLLQB）对265 nm发光的AlGaN紫外- c （UV-C）纳米线LED的光电性能进行了数值分析。SGSLLQB取代了传统的末量子势垒，降低了空穴的能量势垒，增强了阱的电子约束能力，从而实现了更强的辐射复合。因此，光输出功率提高了37%，内部量子效率从传统的最后量子势垒的53%提高到SGSLLQB的63%。这些结果表明，SGSLLQB是在不改变整体器件设计的情况下提高AlGaN UV-C纳米线led性能的有效方法。这项工作强调了屏障工程在开发未来光电应用的高效UV-C纳米线led中的作用。
{"title":"Optimized last quantum barrier design for enhanced performance of Ultraviolet-C (UV-C) AlGaN nanowire light-emitting diodes","authors":"Anuda Bibi, Muhammad Usman, Shazma Ali, Aiman Fatima, Haseena Noor","doi":"10.1016/j.jlumin.2026.121754","DOIUrl":"10.1016/j.jlumin.2026.121754","url":null,"abstract":"<div><div>The optoelectronic performance of an AlGaN ultraviolet-C (UV-C) nanowire LED emitting at 265 nm is numerically analyzed by incorporating a step-graded superlattice last quantum barrier (SGSLLQB). A SGSLLQB is employed in place of a conventional last quantum barrier, which lowers the energy barrier for holes and enhances the electron confining capability of wells, leading to stronger radiative recombination. Consequently, the optical output power was enhanced by 37 % and internal quantum efficiency increased from 53 % for a conventional last quantum barrier to 63 % for the SGSLLQB. These results demonstrate that the SGSLLQB is an effective method to enhance the performance of AlGaN UV-C nanowire LEDs without changing the overall device design. This work highlights the role of barrier engineering in developing high-efficiency UV-C nanowire LEDs for future optoelectronic applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121754"},"PeriodicalIF":3.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-12DOI: 10.1016/j.jlumin.2026.121755
Wanjia Wang , Lixia Jing , Yanqing Zu , Kangmin Yang , Run Gan , Yue Peng , Decui Gong , Peitao Liu , Xiaodong Li , Zhaoxin Wu , Ailing Feng
Metal halide perovskite quantum dots (PQDs) have emerged as promising emissive materials for next-generation light-emitting diodes due to their exceptional properties, including high luminescence efficiency, facile spectral tunability, high colour purity and cost-effective solution processability. The organic ligands such as long-chain alkyl acids and amines are traditionally used in the synthesis of PQDs, which enable to effectively passivate the surface defects and maintain the colloidal stability. However, these insulating long-chain ligands will hinder the charge transport within PQDs films and weaken the performance of perovskite quantum dots light-emitting diodes (PeQLEDs). In this review, some highly conductive reagent like conjugated or short-chain organic ligands, inorganic and hybrid ligands that enhance the efficiency of PeQLEDs were summarized. Finally, current challenges and future perspectives of PQDs are outlined, emphasizing the potential of advanced ligand design in achieving high-performance optoelectronic devices.
{"title":"Highly conductive ligands resurfacing perovskite quantum dots boost the efficiency of light-emitting diodes","authors":"Wanjia Wang , Lixia Jing , Yanqing Zu , Kangmin Yang , Run Gan , Yue Peng , Decui Gong , Peitao Liu , Xiaodong Li , Zhaoxin Wu , Ailing Feng","doi":"10.1016/j.jlumin.2026.121755","DOIUrl":"10.1016/j.jlumin.2026.121755","url":null,"abstract":"<div><div>Metal halide perovskite quantum dots (PQDs) have emerged as promising emissive materials for next-generation light-emitting diodes due to their exceptional properties, including high luminescence efficiency, facile spectral tunability, high colour purity and cost-effective solution processability. The organic ligands such as long-chain alkyl acids and amines are traditionally used in the synthesis of PQDs, which enable to effectively passivate the surface defects and maintain the colloidal stability. However, these insulating long-chain ligands will hinder the charge transport within PQDs films and weaken the performance of perovskite quantum dots light-emitting diodes (PeQLEDs). In this review, some highly conductive reagent like conjugated or short-chain organic ligands, inorganic and hybrid ligands that enhance the efficiency of PeQLEDs were summarized. Finally, current challenges and future perspectives of PQDs are outlined, emphasizing the potential of advanced ligand design in achieving high-performance optoelectronic devices.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121755"},"PeriodicalIF":3.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-08DOI: 10.1016/j.jlumin.2026.121753
Jiarong Zhao , Yuan-Hao Zhu , Lin Zhang , Rongqiao Wan , Zhaozhen Wang , Qimiao Chen , Shaoteng Wu , Chuan Seng Tan , Jun-Wei Luo
The Ge1-xSnx alloy is a promising candidate for silicon-based optoelectronic devices, yet few experimental studies have investigated its full indirect-to-direct bandgap transition behavior. The photoluminescence (PL) characteristics of Ge1-xSnx films with Sn compositions of 3.3 %, 6.5 %, 10.3 %, and 12.8 % were investigated by a high-resolution and wide spectrum (1∼5.5 μm) Fourier Transform Infrared Spectrometer PL system. Owing to the wide spectrum measurement capability, the PL spectra of these Ge1-xSnx films can be compared in a single system. It can be seen that the PL spectrum of the high-Sn content GeSn film (12.8 %) exhibits a high-energy shoulder peak, which is different from the low-Sn content GeSn film (3.3 %) with a low-energy shoulder peak. By extracting the transition peak position through Gaussian fitting, we observed for the first time that the direct bandgap energy of the high-Sn content GeSn is lower than the indirect bandgap energy, resulting in the negative energy separation. Furthermore, as the Sn content increases, a clear indirect-to-direct transition is observed, which leads to opposite temperature-dependent PL-intensity trends between the high- and low-component GeSn films. Finally, the insensitivity to temperature was demonstrated in GeSn with Sn compositions of 6.5 %, indicating a balance between radiative and non-radiative recombination. These findings provide further evidence of - and -valley inversion and quasi-direct bandgap GeSn materials, indicating great potential for direct bandgap GeSn and GeSn based optoelectronic devices grown on Si.
{"title":"Systematic investigation of photoluminescence characteristics in GeSn films with varied Sn content by high-resolution and wide-spectrum system","authors":"Jiarong Zhao , Yuan-Hao Zhu , Lin Zhang , Rongqiao Wan , Zhaozhen Wang , Qimiao Chen , Shaoteng Wu , Chuan Seng Tan , Jun-Wei Luo","doi":"10.1016/j.jlumin.2026.121753","DOIUrl":"10.1016/j.jlumin.2026.121753","url":null,"abstract":"<div><div>The Ge<sub>1-x</sub>Sn<sub>x</sub> alloy is a promising candidate for silicon-based optoelectronic devices, yet few experimental studies have investigated its full indirect-to-direct bandgap transition behavior. The photoluminescence (PL) characteristics of Ge<sub>1-x</sub>Sn<sub>x</sub> films with Sn compositions of 3.3 %, 6.5 %, 10.3 %, and 12.8 % were investigated by a high-resolution and wide spectrum (1∼5.5 μm) Fourier Transform Infrared Spectrometer PL system. Owing to the wide spectrum measurement capability, the PL spectra of these Ge<sub>1-x</sub>Sn<sub>x</sub> films can be compared in a single system. It can be seen that the PL spectrum of the high-Sn content GeSn film (12.8 %) exhibits a high-energy shoulder peak, which is different from the low-Sn content GeSn film (3.3 %) with a low-energy shoulder peak. By extracting the transition peak position through Gaussian fitting, we observed for the first time that the direct bandgap energy of the high-Sn content GeSn is lower than the indirect bandgap energy, resulting in the negative energy separation. Furthermore, as the Sn content increases, a clear indirect-to-direct transition is observed, which leads to opposite temperature-dependent PL-intensity trends between the high- and low-component GeSn films. Finally, the insensitivity to temperature was demonstrated in GeSn with Sn compositions of 6.5 %, indicating a balance between radiative and non-radiative recombination. These findings provide further evidence of <span><math><mrow><mi>Γ</mi></mrow></math></span>- and <span><math><mrow><mi>L</mi></mrow></math></span>-valley inversion and quasi-direct bandgap GeSn materials, indicating great potential for direct bandgap GeSn and GeSn based optoelectronic devices grown on Si.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121753"},"PeriodicalIF":3.6,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-08DOI: 10.1016/j.jlumin.2026.121735
Erdem Uzun , Zehra Özdemir , Esra Özturk
Thermoluminescence properties of aluminate based persistent luminescence phosphors such as Sr3Al2O6:Eu3+,Ho3+, Sr2.99Ba0.01Al2O6:Eu3+,Ho3+, Sr2.99Mg0.01Al2O6:Eu3+,Ho3+, Ba3Al8O15:Eu3+,Dy3+, Ca3Al8O15:Eu3+,Dy3+, and Mg3Al8O15:Eu3+,Dy3+ were investigated. Natural thermoluminescence emission, reusability, the effects of alpha-beta irradiation on the glow curve, and fading properties were analysed. Peak position, variable dose and glow curve fitting methods were applied to the phosphors and fundamental trapping parameters were calculated. Phosphors were irradiated up to the saturation dose level, and the concentrations of electron traps were measured experimentally. An energy-band configuration containing 7 active electron traps, corresponding to the 7 TL peaks observed experimentally, has been proposed to explain the theoretical TL glow curve in the materials. The phosphors show a natural thermoluminescence emission; however, this disappears following a heating treatment. The glow curves of the phosphors have seven distinct glow peaks and many low and high-temperature satellite maximums. It was observed that the individual TL peaks originate from the Eu-doped alumina, and Sr, Ba, Ca, Dy and Ho impurities did not change the individual peak temperatures of the matrix material or produce a new glow peak. However, the peak intensities are highly sensitive to the presence of dopants. It has been observed that alpha radiation affects relatively shallow electron traps more strongly, resulting in the TL glow peaks appearing at lower temperatures. The phosphors show both normal and abnormal fading characteristics during both short-term and long-term storage.
{"title":"Thermoluminescence properties of some aluminate based persistent luminescence phosphors","authors":"Erdem Uzun , Zehra Özdemir , Esra Özturk","doi":"10.1016/j.jlumin.2026.121735","DOIUrl":"10.1016/j.jlumin.2026.121735","url":null,"abstract":"<div><div>Thermoluminescence properties of aluminate based persistent luminescence phosphors such as Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>:Eu<sup>3+</sup>,Ho<sup>3+</sup>, Sr<sub>2.99</sub>Ba<sub>0.01</sub>Al<sub>2</sub>O<sub>6</sub>:Eu<sup>3+</sup>,Ho<sup>3+</sup>, Sr<sub>2.99</sub>Mg<sub>0.01</sub>Al<sub>2</sub>O<sub>6</sub>:Eu<sup>3+</sup>,Ho<sup>3+</sup>, Ba<sub>3</sub>Al<sub>8</sub>O<sub>15</sub>:Eu<sup>3+</sup>,Dy<sup>3+</sup>, Ca<sub>3</sub>Al<sub>8</sub>O<sub>15</sub>:Eu<sup>3+</sup>,Dy<sup>3+</sup>, and Mg<sub>3</sub>Al<sub>8</sub>O<sub>15</sub>:Eu<sup>3+</sup>,Dy<sup>3+</sup> were investigated. Natural thermoluminescence emission, reusability, the effects of alpha-beta irradiation on the glow curve, and fading properties were analysed. Peak position, variable dose and glow curve fitting methods were applied to the phosphors and fundamental trapping parameters were calculated. Phosphors were irradiated up to the saturation dose level, and the concentrations of electron traps were measured experimentally. An energy-band configuration containing 7 active electron traps, corresponding to the 7 TL peaks observed experimentally, has been proposed to explain the theoretical TL glow curve in the materials. The phosphors show a natural thermoluminescence emission; however, this disappears following a heating treatment. The glow curves of the phosphors have seven distinct glow peaks and many low and high-temperature satellite maximums. It was observed that the individual TL peaks originate from the Eu-doped alumina, and Sr, Ba, Ca, Dy and Ho impurities did not change the individual peak temperatures of the matrix material or produce a new glow peak. However, the peak intensities are highly sensitive to the presence of dopants. It has been observed that alpha radiation affects relatively shallow electron traps more strongly, resulting in the TL glow peaks appearing at lower temperatures. The phosphors show both normal and abnormal fading characteristics during both short-term and long-term storage.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121735"},"PeriodicalIF":3.6,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-07DOI: 10.1016/j.jlumin.2026.121752
Dejian Hou , Jianhong Dong , Rui Huang , Huihong Lin , Shaomin Lin , Yi Zhang , Zhenxu Lin , Huan Yang , Hailong Liu , Jinyan Li
Multiple-emission phosphors, which can be engineered via co-doping strategies and energy transfer regulation, have become a research hotspot in recent years. In this research, Mn2+ and Cr3+ doped Sr2MgAl22O36 phosphors were prepared using a high-temperature solid-state reaction method. The green light emission of Mn2+ and the deep-red emission of Cr3+ were investigated, and the impacts of doping concentration and temperature were discussed in detail. Dual-band emission can be achieved for co-doped samples under blue light excitation, and the energy transfer from Mn2+ to Cr3+ was confirmed. Owing to the distinct temperature responses of Mn2+ and Cr3+, optical temperature sensing properties were demonstrated for the co-doped sample, which may offer a feasible approach for non-contact temperature measurement. Moreover, a triple-emission phosphor-converted light-emitting diode (pc-LED) device was fabricated, highlighting the potential application of Sr2MgAl22O36:Mn2+,Cr3+ in plant growth.
{"title":"Luminescence properties, energy transfer, and potential applications of Sr2MgAl22O36:Mn2+,Cr3+ phosphor","authors":"Dejian Hou , Jianhong Dong , Rui Huang , Huihong Lin , Shaomin Lin , Yi Zhang , Zhenxu Lin , Huan Yang , Hailong Liu , Jinyan Li","doi":"10.1016/j.jlumin.2026.121752","DOIUrl":"10.1016/j.jlumin.2026.121752","url":null,"abstract":"<div><div>Multiple-emission phosphors, which can be engineered via co-doping strategies and energy transfer regulation, have become a research hotspot in recent years. In this research, Mn<sup>2+</sup> and Cr<sup>3+</sup> doped Sr<sub>2</sub>MgAl<sub>22</sub>O<sub>36</sub> phosphors were prepared using a high-temperature solid-state reaction method. The green light emission of Mn<sup>2+</sup> and the deep-red emission of Cr<sup>3+</sup> were investigated, and the impacts of doping concentration and temperature were discussed in detail. Dual-band emission can be achieved for co-doped samples under blue light excitation, and the energy transfer from Mn<sup>2+</sup> to Cr<sup>3+</sup> was confirmed. Owing to the distinct temperature responses of Mn<sup>2+</sup> and Cr<sup>3+</sup>, optical temperature sensing properties were demonstrated for the co-doped sample, which may offer a feasible approach for non-contact temperature measurement. Moreover, a triple-emission phosphor-converted light-emitting diode (pc-LED) device was fabricated, highlighting the potential application of Sr<sub>2</sub>MgAl<sub>22</sub>O<sub>36</sub>:Mn<sup>2+</sup>,Cr<sup>3+</sup> in plant growth.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121752"},"PeriodicalIF":3.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-07DOI: 10.1016/j.jlumin.2025.121694
Lauany Mazzon Pontes , João Vitor Gonçalves de Faria , Julia Santana Reinaldi , Patrícia Paula Araújo Magrin , Natalia Nascimento Silveira , Raquel Alves dos Santos , Lucas Alonso Rocha , Marc Verelst , Eduardo José Nassar
Calcium phosphates (CPs) have been widely used in biomedical applications due to their excellent biocompatibility, crystalline structure, and low toxicity. These characteristics allow structural modifications during synthesis, such as substitution with lanthanide ions, which confer luminescent properties to the matrix. In this study, a CP matrix was synthesized from phosphoric acid and calcium nitrate, with partial substitution of calcium ions by the lanthanide ions erbium (Er3+) and ytterbium (Yb3+) at 1 % and 10 % concentrations, respectively. Characterization by X-ray diffraction revealed a mixture of CP phases. Vibrational spectroscopy in the infrared region identified characteristic matrix bands. Photoluminescence analysis showed bands attributed to Er3+ in the visible and infrared regions. In upconversion energy analyses, using 980 nm laser excitation with power variation between 490 and 1000 mW, more intense emissions were observed in the green region. The increase in power suggested possible thermal excitation of electrons. In temperature variation experiments (25–100 °C), the material demonstrated and confirmed significant thermal sensitivity, indicating potential for application in optical temperature sensing. Cytotoxicity assays indicated no impairment of cell viability at any of the tested concentrations, with behavior similar to the negative control at 24, 48, and 72 h.
{"title":"Luminescent properties OF Er3+ and Yb3+ IONS IN a calcium phosphate matrix","authors":"Lauany Mazzon Pontes , João Vitor Gonçalves de Faria , Julia Santana Reinaldi , Patrícia Paula Araújo Magrin , Natalia Nascimento Silveira , Raquel Alves dos Santos , Lucas Alonso Rocha , Marc Verelst , Eduardo José Nassar","doi":"10.1016/j.jlumin.2025.121694","DOIUrl":"10.1016/j.jlumin.2025.121694","url":null,"abstract":"<div><div>Calcium phosphates (CPs) have been widely used in biomedical applications due to their excellent biocompatibility, crystalline structure, and low toxicity. These characteristics allow structural modifications during synthesis, such as substitution with lanthanide ions, which confer luminescent properties to the matrix. In this study, a CP matrix was synthesized from phosphoric acid and calcium nitrate, with partial substitution of calcium ions by the lanthanide ions erbium (Er<sup>3+</sup>) and ytterbium (Yb<sup>3+</sup>) at 1 % and 10 % concentrations, respectively. Characterization by X-ray diffraction revealed a mixture of CP phases. Vibrational spectroscopy in the infrared region identified characteristic matrix bands. Photoluminescence analysis showed bands attributed to Er<sup>3+</sup> in the visible and infrared regions. In upconversion energy analyses, using 980 nm laser excitation with power variation between 490 and 1000 mW, more intense emissions were observed in the green region. The increase in power suggested possible thermal excitation of electrons. In temperature variation experiments (25–100 °C), the material demonstrated and confirmed significant thermal sensitivity, indicating potential for application in optical temperature sensing. Cytotoxicity assays indicated no impairment of cell viability at any of the tested concentrations, with behavior similar to the negative control at 24, 48, and 72 h.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121694"},"PeriodicalIF":3.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-07DOI: 10.1016/j.jlumin.2026.121751
Mahmoud A. Khalifa , Mahmoud Abdelfatah , Mohamed A. Habib , Abdelhamid El-Shaer
Temperature-dependent photoluminescence (TDPL) provides powerful insight into the optical features of semiconductors. In this work, we investigate the impact of solution pH (9–13) on structural, morphological, and photoluminescence (PL) properties of Cu2O micrograins, with a particular focus on how these PL changes are obvious at low temperatures (14 K–290 K). X-ray diffraction and scanning electron microscopy results reveal a pH-induced transition in preferred orientation from (200) to (111) facets, accompanied with morphological evolution from small to large micrograins. TDPL measurements uncover distinct recombination mechanisms; besides the near-band excitonic transitions of Cu2O, two strong emission bands related to relaxed excitons at oxygen and copper vacancies are noticed. At 14 K, the pH 9 sample displays a broad PL emission centered at 748 nm, attributed to oxygen vacancies. In contrast, the pH 13 sample displays two distinct peaks at 680 nm and 849 nm, corresponding to oxygen and copper vacancies, respectively. These defect-related emissions are absent in the room-temperature PL spectra. Furthermore, the activation energies (Ea) of these vacancies, determined using the Arrhenius model, are 29.9 meV for oxygen vacancies in the pH 9 sample, and 19.2 meV (oxygen vacancies) and 39.4 meV (copper vacancies) for the pH 13 sample. These results of correlation thermal PL behavior with structural modulation highlight an effective strategy for tuning the defects in Cu2O and underscore the value of TDPL in resolving emission pathways relevant to tunable optoelectronic applications.
{"title":"Revealing defects in Cu2O microstructures: Temperature-dependent photoluminescence insights from pH-tuned facet engineering Cu2O","authors":"Mahmoud A. Khalifa , Mahmoud Abdelfatah , Mohamed A. Habib , Abdelhamid El-Shaer","doi":"10.1016/j.jlumin.2026.121751","DOIUrl":"10.1016/j.jlumin.2026.121751","url":null,"abstract":"<div><div>Temperature-dependent photoluminescence (TDPL) provides powerful insight into the optical features of semiconductors. In this work, we investigate the impact of solution pH (9–13) on structural, morphological, and photoluminescence (PL) properties of Cu<sub>2</sub>O micrograins, with a particular focus on how these PL changes are obvious at low temperatures (14 K–290 K). X-ray diffraction and scanning electron microscopy results reveal a pH-induced transition in preferred orientation from (200) to (111) facets, accompanied with morphological evolution from small to large micrograins. TDPL measurements uncover distinct recombination mechanisms; besides the near-band excitonic transitions of Cu<sub>2</sub>O, two strong emission bands related to relaxed excitons at oxygen and copper vacancies are noticed. At 14 K, the pH 9 sample displays a broad PL emission centered at 748 nm, attributed to oxygen vacancies. In contrast, the pH 13 sample displays two distinct peaks at 680 nm and 849 nm, corresponding to oxygen and copper vacancies, respectively. These defect-related emissions are absent in the room-temperature PL spectra. Furthermore, the activation energies (E<sub>a</sub>) of these vacancies, determined using the Arrhenius model, are 29.9 meV for oxygen vacancies in the pH 9 sample, and 19.2 meV (oxygen vacancies) and 39.4 meV (copper vacancies) for the pH 13 sample. These results of correlation thermal PL behavior with structural modulation highlight an effective strategy for tuning the defects in Cu<sub>2</sub>O and underscore the value of TDPL in resolving emission pathways relevant to tunable optoelectronic applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121751"},"PeriodicalIF":3.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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