Pub Date : 2026-05-01Epub Date: 2026-02-09DOI: 10.1016/j.jlumin.2026.121787
Lipeng Jiang , Yansong Li , Kexin Wang , Jingyi Zhang , Jing Wang , Hongbo Yu , Weiwei Jiang , Zhongxiang Shi , Jun Shi , Liangliang Zhang
The double perovskite (M2BB'O6) structure serves as an excellent luminescent matrix, enabling tunable near-infrared (NIR) emission by doping Cr3+ and ion substitution. However, current studies focus primarily on ion substitution within the same crystal system, neglecting the impact of phase transitions induced by M substitution on Cr3+ luminescence. Here, the structural evolution and tuning of luminescence properties induced by M cation substitution (Ba2+→Ca2+) were investigated. Replacing Ba2+ with Ca2+ drives a structural transition from the cubic phase (Fm-3m) to the monoclinic phase (P21/n), accompanied by a significant enhancement in the crystal field strength of Cr3+ (Dq/B ratio increased from 1.57 to 2.15). This structural modulation induces a blue shift of the NIR emission peak from 896 (Ba2ScTaO6: Cr3+) to 837 nm (Ca2ScTaO6: Cr3+) and a marked boost in emission intensity. Furthermore, the increased structural rigidity significantly suppresses non-radiative transitions, with Ca2ScTaO6: Cr3+ exhibiting outstanding thermal stability. Its normalized emission intensity (I423 K/I303 K) reaches 46.9%, nearly double that of Ba2ScTaO6: Cr3+ (24.8%). This work provides a new alternative for designing high-performance NIR phosphors.
{"title":"Cation substitution-induced phase transition for boosting near-infrared luminescence and thermal stability in Cr3+-Activated double perovskites","authors":"Lipeng Jiang , Yansong Li , Kexin Wang , Jingyi Zhang , Jing Wang , Hongbo Yu , Weiwei Jiang , Zhongxiang Shi , Jun Shi , Liangliang Zhang","doi":"10.1016/j.jlumin.2026.121787","DOIUrl":"10.1016/j.jlumin.2026.121787","url":null,"abstract":"<div><div>The double perovskite (M<sub>2</sub>BB'O<sub>6</sub>) structure serves as an excellent luminescent matrix, enabling tunable near-infrared (NIR) emission by doping Cr<sup>3+</sup> and ion substitution. However, current studies focus primarily on ion substitution within the same crystal system, neglecting the impact of phase transitions induced by M substitution on Cr<sup>3+</sup> luminescence. Here, the structural evolution and tuning of luminescence properties induced by M cation substitution (Ba<sup>2+</sup>→Ca<sup>2+</sup>) were investigated. Replacing Ba<sup>2+</sup> with Ca<sup>2+</sup> drives a structural transition from the cubic phase (Fm-3m) to the monoclinic phase (P21/n), accompanied by a significant enhancement in the crystal field strength of Cr<sup>3+</sup> (Dq/B ratio increased from 1.57 to 2.15). This structural modulation induces a blue shift of the NIR emission peak from 896 (Ba<sub>2</sub>ScTaO<sub>6</sub>: Cr<sup>3+</sup>) to 837 nm (Ca<sub>2</sub>ScTaO<sub>6</sub>: Cr<sup>3+</sup>) and a marked boost in emission intensity. Furthermore, the increased structural rigidity significantly suppresses non-radiative transitions, with Ca<sub>2</sub>ScTaO<sub>6</sub>: Cr<sup>3+</sup> exhibiting outstanding thermal stability. Its normalized emission intensity (I<sub>423 K</sub>/I<sub>303 K</sub>) reaches 46.9%, nearly double that of Ba<sub>2</sub>ScTaO<sub>6</sub>: Cr<sup>3+</sup> (24.8%). This work provides a new alternative for designing high-performance NIR phosphors.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121787"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189887","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 : 2026-05-01Epub 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":"2026-05-01","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 : 2026-05-01Epub 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":"2026-05-01","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 : 2026-05-01Epub Date: 2026-01-20DOI: 10.1016/j.jlumin.2026.121762
Yuansheng Ma , Xing Zhang , Xu Yang , Zihao Ren , Weizhen Zhang , Xu Li , Yingnan Guo , Fenghe Wang
Er3+-doped phosphors have fascinating near-infrared (NIR) emission around 1.5 μm; however, they suffer from low NIR efficiency and are difficult to be excited by blue light. Herein, an Er3+ doped LiSc2SbO6 phosphor was successfully synthesized and its luminescence performance under blue excitation has been improved in the following ways: distance control between adjacent Er3+ ions; regulation of luminescence center symmetry; and blue light absorption enhancement. The Cr3+ co-dope broadens the emission spectra and covers both NIR-I and NIR-II regions (700–1650 nm). Notably, benefitting from the [Zn2+-Zn2+] ions pair replacement and Cr-Er energy transfer optimization, the blue light excitable NIR-II emission from Er3+ achieves an intensity 26.5 times higher, and the total NIR-I and NIR-II emission intensity enhanced by 39.2 times. The dual NIR bands of Er3+,Cr3+ co-doped (LiSc)1-yZn2yScSbO6 paves the way for NIR light sources pumped by commercial blue light-emitting diode (LED) chips in potential night-vision, and infrared imaging applications.
{"title":"Luminescence modulation of blue LED excitable Er3+-doped phosphor for both NIR-I and NIR-II emission","authors":"Yuansheng Ma , Xing Zhang , Xu Yang , Zihao Ren , Weizhen Zhang , Xu Li , Yingnan Guo , Fenghe Wang","doi":"10.1016/j.jlumin.2026.121762","DOIUrl":"10.1016/j.jlumin.2026.121762","url":null,"abstract":"<div><div>Er<sup>3+</sup>-doped phosphors have fascinating near-infrared (NIR) emission around 1.5 μm; however, they suffer from low NIR efficiency and are difficult to be excited by blue light. Herein, an Er<sup>3+</sup> doped LiSc<sub>2</sub>SbO<sub>6</sub> phosphor was successfully synthesized and its luminescence performance under blue excitation has been improved in the following ways: distance control between adjacent Er<sup>3+</sup> ions; regulation of luminescence center symmetry; and blue light absorption enhancement. The Cr<sup>3+</sup> co-dope broadens the emission spectra and covers both NIR-I and NIR-II regions (700–1650 nm). Notably, benefitting from the [Zn<sup>2+</sup>-Zn<sup>2+</sup>] ions pair replacement and Cr-Er energy transfer optimization, the blue light excitable NIR-II emission from Er<sup>3+</sup> achieves an intensity 26.5 times higher, and the total NIR-I and NIR-II emission intensity enhanced by 39.2 times. The dual NIR bands of Er<sup>3+</sup>,Cr<sup>3+</sup> co-doped (LiSc)<sub>1-y</sub>Zn<sub>2y</sub>ScSbO<sub>6</sub> paves the way for NIR light sources pumped by commercial blue light-emitting diode (LED) chips in potential night-vision, and infrared imaging applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121762"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090271","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 : 2026-05-01Epub Date: 2026-01-19DOI: 10.1016/j.jlumin.2026.121765
YinFei Liu , Wei Zhu , Feifei Huang , Renguang Ye , Hongping Ma , Youjie Hua , Shiqing Xu
Achieving high color rendering index (CRI) in white LEDs requires the use of red-emitting phosphors. With the expanding application range of high-power LEDs and laser diodes, the demand for thermal stability of phosphor has become increasingly stringent. In this study, a series of novel red-emitting phosphors Sr2-xLiAlO4: xSm3+ (x = 0.01–0.18) were synthesized by a solid-state reaction. Under 407 nm excitation, this phosphor displays a prominent red emission (608 nm) characterized by the dominant 4G → 6H transition of Sm3+. The phosphor maintains 98.5 % of its luminescence intensity at 200 °C compared to room temperature (30 °C). This indicates that Sr1.91LiAlO4: 0.09Sm3+ phosphor has excellent thermal stability, which is attributed to the high rigidity of its crystal structure. A white LED was fabricated by coating a 365 nm near-UV chip with a blend of phosphors: the red Sr1.91LiAlO4: 0.09Sm3+, a yellow-green (Sr, Ba)2SiO4: Eu2+ and a blue BaMgAl10O17: Eu2+ phosphors. The device emits white light with a high color rendering index (CRI) of 94.4 and a correlated color temperature (CCT) of 5625 K. The results demonstrate the promising application potential of the Sr1.91LiAlO4: 0.09Sm3+ red phosphor in white LED applications.
{"title":"High thermal stability and red emitting phosphor Sr2LiAlO4: Sm3+ for white LED","authors":"YinFei Liu , Wei Zhu , Feifei Huang , Renguang Ye , Hongping Ma , Youjie Hua , Shiqing Xu","doi":"10.1016/j.jlumin.2026.121765","DOIUrl":"10.1016/j.jlumin.2026.121765","url":null,"abstract":"<div><div>Achieving high color rendering index (CRI) in white LEDs requires the use of red-emitting phosphors. With the expanding application range of high-power LEDs and laser diodes, the demand for thermal stability of phosphor has become increasingly stringent. In this study, a series of novel red-emitting phosphors Sr<sub>2-<em>x</em></sub>LiAlO<sub>4</sub>: <em>x</em>Sm<sup>3+</sup> (<em>x</em> = 0.01–0.18) were synthesized by a solid-state reaction. Under 407 nm excitation, this phosphor displays a prominent red emission (608 nm) characterized by the dominant <sup>4</sup>G → <sup>6</sup>H transition of Sm<sup>3+</sup>. The phosphor maintains 98.5 % of its luminescence intensity at 200 °C compared to room temperature (30 °C). This indicates that Sr<sub>1.91</sub>LiAlO<sub>4</sub>: 0.09Sm<sup>3+</sup> phosphor has excellent thermal stability, which is attributed to the high rigidity of its crystal structure. A white LED was fabricated by coating a 365 nm near-UV chip with a blend of phosphors: the red Sr<sub>1.91</sub>LiAlO<sub>4</sub>: 0.09Sm<sup>3+</sup>, a yellow-green (Sr, Ba)<sub>2</sub>SiO<sub>4</sub>: Eu<sup>2+</sup> and a blue BaMgAl<sub>10</sub>O<sub>17</sub>: Eu<sup>2+</sup> phosphors. The device emits white light with a high color rendering index (CRI) of 94.4 and a correlated color temperature (CCT) of 5625 K. The results demonstrate the promising application potential of the Sr<sub>1.91</sub>LiAlO<sub>4</sub>: 0.09Sm<sup>3+</sup> red phosphor in white LED applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121765"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090334","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 : 2026-05-01Epub Date: 2026-02-12DOI: 10.1016/j.jlumin.2026.121806
Bingjie Han , Xin Zeng , Feng Xu , Hongyu Liu , Chaofeng Li , Wei Li , Hui Wang , Yu Liu , Lei Shi
A well-documented negative correlation exists between the luminescent efficiency of Mn4+-doped oxide phosphors and oxygen vacancy concentration; therefore, minimizing the latter serves as a core strategy to enhance Mn4+ luminescent performance. To address the inherent trade-off between luminescent intensity and thermal stability in conventional Mn4+-doped phosphors, this study designed equivalently doped double perovskite materials based on Ca2GdB’O6. Via the complete substitution of pentavalent cations at the B′-site of Ca2GdB’O6 with equimolar Ti4+/W6+, a charge-balanced matrix (Ca2GdTi0.5W0.5O6, CGTW) was constructed, which features Mn4+-compatible doping sites. Comprehensive characterizations demonstrated that the CGTW:Mn4+ red phosphor achieves an internal quantum efficiency (IQE) of 63.61% under 322 nm excitation. At 423 K, its emission intensity retains 74.3% of the value measured at 298 K, outperforming the majority of previously reported Mn4+-doped double perovskite materials. Supplementary lighting experiments for plant growth further verified that the red emission of this material exerts a positive effect on plant growth. This work presents a feasible composition-optimization strategy for high-performance Mn4+-activated double perovskite phosphors, thereby providing guidance for the rational design in the fields of solid-state lighting and plant cultivation.
{"title":"Ca2GdTi0.5W0.5O6:Mn4+ deep-red phosphor with high thermal stability for application in plant growth lighting","authors":"Bingjie Han , Xin Zeng , Feng Xu , Hongyu Liu , Chaofeng Li , Wei Li , Hui Wang , Yu Liu , Lei Shi","doi":"10.1016/j.jlumin.2026.121806","DOIUrl":"10.1016/j.jlumin.2026.121806","url":null,"abstract":"<div><div>A well-documented negative correlation exists between the luminescent efficiency of Mn<sup>4+</sup>-doped oxide phosphors and oxygen vacancy concentration; therefore, minimizing the latter serves as a core strategy to enhance Mn<sup>4+</sup> luminescent performance. To address the inherent trade-off between luminescent intensity and thermal stability in conventional Mn<sup>4+</sup>-doped phosphors, this study designed equivalently doped double perovskite materials based on Ca<sub>2</sub>GdB’O<sub>6</sub>. Via the complete substitution of pentavalent cations at the B′-site of Ca<sub>2</sub>GdB’O<sub>6</sub> with equimolar Ti<sup>4+</sup>/W<sup>6+</sup>, a charge-balanced matrix (Ca<sub>2</sub>GdTi<sub>0.5</sub>W<sub>0.5</sub>O<sub>6</sub>, CGTW) was constructed, which features Mn<sup>4+</sup>-compatible doping sites. Comprehensive characterizations demonstrated that the CGTW:Mn<sup>4+</sup> red phosphor achieves an internal quantum efficiency (IQE) of 63.61% under 322 nm excitation. At 423 K, its emission intensity retains 74.3% of the value measured at 298 K, outperforming the majority of previously reported Mn<sup>4+</sup>-doped double perovskite materials. Supplementary lighting experiments for plant growth further verified that the red emission of this material exerts a positive effect on plant growth. This work presents a feasible composition-optimization strategy for high-performance Mn<sup>4+</sup>-activated double perovskite phosphors, thereby providing guidance for the rational design in the fields of solid-state lighting and plant cultivation.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121806"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189991","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}
The band-to-acceptor photoluminescence in a transverse magnetic field has been investigated experimentally and theoretically in GaAs/AlAs heterojunctions. The observed linear polarization of the photoluminescence is due to two contributions. The first one arises in zero magnetic field with increasing background acceptor concentration in the heterostructure. The second one is induced by the transverse magnetic field. The experimental findings are explained within a theoretical model that accounts for the quantum-dimensional axial splitting, the in-plane crystal structure anisotropy, the Zeeman splitting of electrons and holes in magnetic field, and the redistribution of carriers over the spin sublevels in the depletion region at the heterojunction.
{"title":"Intrinsic, magnetic-field-induced linear polarization of the band-to-acceptor photoluminescence from a GaAs/AlAs heterojunction","authors":"T.S. Shamirzaev , D.A. Frolov , V.N. Mantsevich , N.S. Averkiev , M.O. Petrushkov , E.A. Emelyanov , V.V. Preobrazhenskii , M.A. Putyato , B.R. Semyagin , V.A. Haisler , D.R. Yakovlev , M. Bayer","doi":"10.1016/j.jlumin.2026.121758","DOIUrl":"10.1016/j.jlumin.2026.121758","url":null,"abstract":"<div><div>The band-to-acceptor photoluminescence in a transverse magnetic field has been investigated experimentally and theoretically in GaAs/AlAs heterojunctions. The observed linear polarization of the photoluminescence is due to two contributions. The first one arises in zero magnetic field with increasing background acceptor concentration in the heterostructure. The second one is induced by the transverse magnetic field. The experimental findings are explained within a theoretical model that accounts for the quantum-dimensional axial splitting, the in-plane crystal structure anisotropy, the Zeeman splitting of electrons and holes in magnetic field, and the redistribution of carriers over the spin sublevels in the depletion region at the heterojunction.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121758"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189994","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 : 2026-05-01Epub Date: 2026-01-31DOI: 10.1016/j.jlumin.2026.121783
M. Isik , T. Yildirim , S. Tüzemen
We present a comprehensive structural and optical investigation of arsenic-rich GaAs crystals grown by the liquid-encapsulated Czochralski (LEC) method. Energy-dispersive X-ray spectroscopy confirms an As-enriched stoichiometry (Ga/As ≈ 0.73), while X-ray diffraction reveals a well-defined zinc blende phase with a strong (400) preferred orientation and a lattice constant close to that of stoichiometric GaAs, indicating good crystalline quality. Temperature-dependent photoluminescence (33–300 K) exhibits intense near-band-edge and bound-exciton emissions at 33 K (∼1.521 eV), accompanied by additional low-energy emission bands. The temperature evolution of the band gap follows the Varshni relation, yielding Eg(0) ≈ 1.52 eV. Analysis of the thermal quenching behavior of the integrated near-band-edge emission intensity using the Arrhenius model provides an activation energy of approximately 30 meV, suggesting that shallow non-radiative recombination centers dominate the deactivation process. These findings elucidate the role of excess arsenic in modifying defect-related recombination processes and radiative dynamics of GaAs and offer valuable insights for the design of defect-engineered optoelectronic and photonic devices.
本文对液体包封法生长的富砷砷化镓晶体进行了全面的结构和光学研究。能量色散x射线光谱证实了砷的富集化学计量（Ga/As≈0.73），而x射线衍射显示出明确的锌闪锌矿相，具有强（400）优先取向，晶格常数接近化学计量的砷化镓，表明晶体质量良好。温度相关的光致发光（33 - 300 K）在33 K （~ 1.521 eV）表现出强烈的近带边缘和束缚激子发射，并伴有额外的低能发射带。带隙的温度演化遵循Varshni关系，产生Eg(0)≈1.52 eV。利用Arrhenius模型分析近带边缘发射强度的热猝灭行为，得到活化能约为30 meV，表明浅层非辐射复合中心主导失活过程。这些发现阐明了过量砷在改变缺陷相关重组过程和砷化镓辐射动力学中的作用，并为缺陷工程光电和光子器件的设计提供了有价值的见解。
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Pub Date : 2026-05-01Epub Date: 2026-02-03DOI: 10.1016/j.jlumin.2026.121790
Erki Enkvist , Marju Vestman , Asko Uri , Steponas Raišys , Karolis Kazlauskas
Interchromophore triplet-to-singlet Förster-type resonant energy transfer (TS-FRET) is a fascinating mechanism enabling the harvesting of energy from triplet excited states in purely organic luminophores, culminating in delayed fluorescence. This process is highly valuable for sensitive, time-gated applications, including luminescence bioassays based on protein-responsive bio-probes. In this study, we synthesized and characterized a series of tandem luminophores composed of diverse phosphorescent donors (thiophene and selenophene) and fluorescent acceptors (Tamra and Rhodamine 101), covalently linked at varying distances, to elucidate the factors governing TS-FRET efficiency. Systematic photophysical measurements, including prompt and delayed emission lifetimes and quantum yields, revealed that the donor’s intersystem crossing (ISC) rate and donor–acceptor (D–A) separation critically influence emission characteristics. Notably, in selenophene donor-based tandem luminophores, maximum delayed fluorescence (quantum yield up to 47%) occurs at a D–A distance of ∼2.6 nm, where donor’s ISC rate outcompetes the singlet–singlet FRET (SS-FRET) rate, and the TS-FRET rate surpasses the donor’s triplet decay rate. While longer linkers in the tandem luminophores enhanced triplet population by suppressing SS-FRET, excessively short linkers resulted in non-radiative quenching. We quantitatively modeled the energy transfer dynamics using a FRET formalism extended to TS-FRET, validating it experimentally and demonstrating its applicability even in complex organic systems. These insights establish clear structure-function relationships in TS-FRET luminophores, guiding the rational design of high-performance, metal-free luminescent probes with tunable, long-lifetime emission.
{"title":"Quantitative photophysics of organic long-lifetime tandem luminophores based on phosphor-sensitized delayed fluorescence","authors":"Erki Enkvist , Marju Vestman , Asko Uri , Steponas Raišys , Karolis Kazlauskas","doi":"10.1016/j.jlumin.2026.121790","DOIUrl":"10.1016/j.jlumin.2026.121790","url":null,"abstract":"<div><div>Interchromophore triplet-to-singlet Förster-type resonant energy transfer (TS-FRET) is a fascinating mechanism enabling the harvesting of energy from triplet excited states in purely organic luminophores, culminating in delayed fluorescence. This process is highly valuable for sensitive, time-gated applications, including luminescence bioassays based on protein-responsive bio-probes. In this study, we synthesized and characterized a series of tandem luminophores composed of diverse phosphorescent donors (thiophene and selenophene) and fluorescent acceptors (Tamra and Rhodamine 101), covalently linked at varying distances, to elucidate the factors governing TS-FRET efficiency. Systematic photophysical measurements, including prompt and delayed emission lifetimes and quantum yields, revealed that the donor’s intersystem crossing (ISC) rate and donor–acceptor (D–A) separation critically influence emission characteristics. Notably, in selenophene donor-based tandem luminophores, maximum delayed fluorescence (quantum yield up to 47%) occurs at a D–A distance of ∼2.6 nm, where donor’s ISC rate outcompetes the singlet–singlet FRET (SS-FRET) rate, and the TS-FRET rate surpasses the donor’s triplet decay rate. While longer linkers in the tandem luminophores enhanced triplet population by suppressing SS-FRET, excessively short linkers resulted in non-radiative quenching. We quantitatively modeled the energy transfer dynamics using a FRET formalism extended to TS-FRET, validating it experimentally and demonstrating its applicability even in complex organic systems. These insights establish clear structure-function relationships in TS-FRET luminophores, guiding the rational design of high-performance, metal-free luminescent probes with tunable, long-lifetime emission.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121790"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189987","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 : 2026-05-01Epub Date: 2026-02-07DOI: 10.1016/j.jlumin.2026.121797
Kai Jiang, Tianxiang Hang, Ciyang Zhang, Mingzhu Xia, Qingli Hao, Wu Lei
A series of EuxTb1-xL {EuxTb1-x(5-bop)3(H2O)4}∞ were synthesized using 3,5-dicarboxyphenylboronic acid (5-bop) as ligands via hydrothermal method. 5-bop ligand functions as an effective antenna, harvesting light and transferring the absorbed energy to both Eu3+ and Tb3+. Tb3+ acts as an intermediary donor, transferring a majority of its energy to the Eu3+. Eu0.1Tb0.9L is the best compound among EuxTb1-xL series which exhibits excellent water stability and higher luminescence intensity compared to single-metal MOFs. It can selectively recognize dopamine hydrochloride (HDA) through fluorescence quenching, featuring fast response speed, high sensitivity, and strong resistance to interference. Additionally, the mechanisms responsible for the fluorescence quenching of EuxTb1-xL include dynamic quenching and UV competitive absorption. This work provides an effective approach for the rapid and convenient detection of HDA in biological fluids.
{"title":"Tb-doped Eu-MOF with significant luminescence in water for the detection of dopamine hydrochloride","authors":"Kai Jiang, Tianxiang Hang, Ciyang Zhang, Mingzhu Xia, Qingli Hao, Wu Lei","doi":"10.1016/j.jlumin.2026.121797","DOIUrl":"10.1016/j.jlumin.2026.121797","url":null,"abstract":"<div><div>A series of Eu<sub>x</sub>Tb<sub>1-x</sub>L {Eu<sub>x</sub>Tb<sub>1-x</sub>(5-bop)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>}<sub>∞</sub> were synthesized using 3,5-dicarboxyphenylboronic acid (5-bop) as ligands via hydrothermal method. 5-bop ligand functions as an effective antenna, harvesting light and transferring the absorbed energy to both Eu<sup>3+</sup> and Tb<sup>3+</sup>. Tb<sup>3+</sup> acts as an intermediary donor, transferring a majority of its energy to the Eu<sup>3+</sup>. Eu<sub>0.1</sub>Tb<sub>0.9</sub>L is the best compound among Eu<sub>x</sub>Tb<sub>1-x</sub>L series which exhibits excellent water stability and higher luminescence intensity compared to single-metal MOFs. It can selectively recognize dopamine hydrochloride (HDA) through fluorescence quenching, featuring fast response speed, high sensitivity, and strong resistance to interference. Additionally, the mechanisms responsible for the fluorescence quenching of Eu<sub>x</sub>Tb<sub>1-x</sub>L include dynamic quenching and UV competitive absorption. This work provides an effective approach for the rapid and convenient detection of HDA in biological fluids.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"293 ","pages":"Article 121797"},"PeriodicalIF":3.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146189992","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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