In this study, Tb3+-doped MgO-Al2O3-B2O3 glasses were prepared using the melt-quenching method as potential candidates for dosimetric applications. The fabricated glass samples exhibited photoluminescence (PL) and thermally stimulated luminescence (TSL) peaks at approximately 490, 545, 590, and 620 nm, attributed to the 4f–4f transitions of Tb3+. The PL quantum yields increased with Tb3+ concentration, reaching a maximum of 92 % for the 10 % Tb3+-doped sample. The PL lifetimes ranged from approximately 1.9 to 2.6 ms. Based on the TSL glow curves and spectra, the 1 % Tb3+-doped sample showed the highest TSL intensity and exhibited good linearity over the dose range of 0.1–1000 mGy.
{"title":"Evaluation of thermally stimulated luminescence characteristics of Tb-doped magnesium aluminoborate glasses","authors":"Shota Otake, Takumi Kato, Akihiro Nishikawa, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida","doi":"10.1016/j.jlumin.2025.121675","DOIUrl":"10.1016/j.jlumin.2025.121675","url":null,"abstract":"<div><div>In this study, Tb<sup>3+</sup>-doped MgO-Al<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub> glasses were prepared using the melt-quenching method as potential candidates for dosimetric applications. The fabricated glass samples exhibited photoluminescence (PL) and thermally stimulated luminescence (TSL) peaks at approximately 490, 545, 590, and 620 nm, attributed to the 4f–4f transitions of Tb<sup>3+</sup>. The PL quantum yields increased with Tb<sup>3+</sup> concentration, reaching a maximum of 92 % for the 10 % Tb<sup>3+</sup>-doped sample. The PL lifetimes ranged from approximately 1.9 to 2.6 ms. Based on the TSL glow curves and spectra, the 1 % Tb<sup>3+</sup>-doped sample showed the highest TSL intensity and exhibited good linearity over the dose range of 0.1–1000 mGy.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121675"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145622800","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 : 2026-02-01Epub Date: 2025-12-05DOI: 10.1016/j.jlumin.2025.121693
Lalnunpuia Khiangte, S. Rai
CdS nanoparticles doped with Ho3+ were synthesized in a silica glass matrix via the in situ sol–gel method, and their structural and optical properties were systematically investigated. Structural characterization including FTIR at 100 °C and 350 °C confirms annealing-induced modification of the silica network. TEM analysis revealed an average particle size of 29.12 nm. The CdS emission band exhibited clear spectral overlap with Ho3+ excitation, suggesting a non-radiative sensitization pathway from CdS to Ho3+ ions. Absorption spectra displayed broad CdS band-edge absorption along with sharp f–f transitions of Ho3+, and the optical bandgap was estimated as 2.9 eV using Tauc analysis. Photoluminescence studies showed both CdS host emission and characteristic Ho3+ transitions, with maximum intensity achieved at 3 mol% Ho3+ doping. CIE chromaticity analysis indicated color purity exceeding 70 % for all samples, peaking at 91.47 % for 2 mol% Ho3+. Annealing studies revealed optimal PL emission at 250 °C, attributed to hydroxyl removal and defect-state formation, while higher annealing temperatures led to ion clustering and reduced defect density. Judd–Ofelt analysis yielded Ω2 = 2.51 × 10−20 cm2, Ω4 = 1.45 × 10−20 cm2, and Ω6 = 1.31 × 10−20 cm2, with a spectroscopic quality factor of 1.10. Radiative parameters and optical gain analysis identified the 5F4 → 5I8 transition at 529 nm as the dominant green emission with high branching ratio. These findings highlight the tunable visible luminescence and favourable gain properties of Ho3+ doped CdS nanocomposites, demonstrating their potential for photonic and display applications.
{"title":"Spectroscopic properties and tunable visible emission of Ho3+ doped CdS nanoparticles in silica glass","authors":"Lalnunpuia Khiangte, S. Rai","doi":"10.1016/j.jlumin.2025.121693","DOIUrl":"10.1016/j.jlumin.2025.121693","url":null,"abstract":"<div><div>CdS nanoparticles doped with Ho<sup>3+</sup> were synthesized in a silica glass matrix via the in situ sol–gel method, and their structural and optical properties were systematically investigated. Structural characterization including FTIR at 100 °C and 350 °C confirms annealing-induced modification of the silica network. TEM analysis revealed an average particle size of 29.12 nm. The CdS emission band exhibited clear spectral overlap with Ho<sup>3+</sup> excitation, suggesting a non-radiative sensitization pathway from CdS to Ho<sup>3+</sup> ions. Absorption spectra displayed broad CdS band-edge absorption along with sharp f–f transitions of Ho<sup>3+</sup>, and the optical bandgap was estimated as 2.9 eV using Tauc analysis. Photoluminescence studies showed both CdS host emission and characteristic Ho<sup>3+</sup> transitions, with maximum intensity achieved at 3 mol% Ho<sup>3+</sup> doping. CIE chromaticity analysis indicated color purity exceeding 70 % for all samples, peaking at 91.47 % for 2 mol% Ho<sup>3+</sup>. Annealing studies revealed optimal PL emission at 250 °C, attributed to hydroxyl removal and defect-state formation, while higher annealing temperatures led to ion clustering and reduced defect density. Judd–Ofelt analysis yielded Ω<sub>2</sub> = 2.51 × 10<sup>−20</sup> cm<sup>2</sup>, Ω<sub>4</sub> = 1.45 × 10<sup>−20</sup> cm<sup>2</sup>, and Ω<sub>6</sub> = 1.31 × 10<sup>−20</sup> cm<sup>2</sup>, with a spectroscopic quality factor of 1.10. Radiative parameters and optical gain analysis identified the <sup>5</sup>F<sub>4</sub> → <sup>5</sup>I<sub>8</sub> transition at 529 nm as the dominant green emission with high branching ratio. These findings highlight the tunable visible luminescence and favourable gain properties of Ho<sup>3+</sup> doped CdS nanocomposites, demonstrating their potential for photonic and display applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121693"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692188","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 : 2026-02-01Epub Date: 2025-12-03DOI: 10.1016/j.jlumin.2025.121691
Qinghong Meng , Jiaming Yuan , Wanjun Yu , Xiangming Li , Yaping Wang , Zhijun Xu , Ji-Guang Li
To meet the diverse requirements of the near-infrared (NIR) phosphor-converted light-emitting-diodes (NIR pc-LEDs) in various fields, high-performance broadband NIR-emitting phosphors are attracting growing interest. A novel garnet-type Gd2CaAl3‒yGaZrO12:yCr3+ (GCAGZ:yCr) NIR phosphor with satisfactory luminescence efficiency and thermal stability was discovered in this work. The typical GCAGZ:0.04Cr phosphor exhibited highly efficient (IQE = 93.3 %, EQE = 20.0 %) broadband NIR emission with peaking at ∼748 nm (full-width at half-maximum ∼102 nm) and excellent thermal stability (88.3 %@423 K) under 450 nm light excitation, owing to the wide band gap of the garnet host, the relatively weak crystal field environment, and the exceedingly weak electron-phonon coupling effect. The NIR pc-LED device constructed by coating this GCAGZ:0.04Cr phosphor on a 450 nm blue LED chip presented outstanding NIR output power (∼44.8 mW) and photoelectric conversion efficiency (19.8 %) under a driving current of 100 mA, showing that this phosphor has huge potential utilized in the construction of NIR pc-LED applied in plant growth lighting, night vision, and non-invasive medical diagnosis.
{"title":"Efficient and thermal stable broadband near-infrared emitting Gd2CaAl3GaZrO12:Cr3+ garnet phosphor: structure, luminescence, and pc-LED application","authors":"Qinghong Meng , Jiaming Yuan , Wanjun Yu , Xiangming Li , Yaping Wang , Zhijun Xu , Ji-Guang Li","doi":"10.1016/j.jlumin.2025.121691","DOIUrl":"10.1016/j.jlumin.2025.121691","url":null,"abstract":"<div><div>To meet the diverse requirements of the near-infrared (NIR) phosphor-converted light-emitting-diodes (NIR pc-LEDs) in various fields, high-performance broadband NIR-emitting phosphors are attracting growing interest. A novel garnet-type Gd<sub>2</sub>CaAl<sub>3‒<em>y</em></sub>GaZrO<sub>12</sub>:<em>y</em>Cr<sup>3+</sup> (GCAGZ:<em>y</em>Cr) NIR phosphor with satisfactory luminescence efficiency and thermal stability was discovered in this work. The typical GCAGZ:0.04Cr phosphor exhibited highly efficient (IQE = 93.3 %, EQE = 20.0 %) broadband NIR emission with peaking at ∼748 nm (full-width at half-maximum ∼102 nm) and excellent thermal stability (88.3 %@423 K) under 450 nm light excitation, owing to the wide band gap of the garnet host, the relatively weak crystal field environment, and the exceedingly weak electron-phonon coupling effect. The NIR pc-LED device constructed by coating this GCAGZ:0.04Cr phosphor on a 450 nm blue LED chip presented outstanding NIR output power (∼44.8 mW) and photoelectric conversion efficiency (19.8 %) under a driving current of 100 mA, showing that this phosphor has huge potential utilized in the construction of NIR pc-LED applied in plant growth lighting, night vision, and non-invasive medical diagnosis.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121691"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692189","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 : 2026-02-01Epub Date: 2025-11-19DOI: 10.1016/j.jlumin.2025.121655
Talita J.S. Ramos
In this work, we provide a detailed investigation into the underlying mechanisms of laser-induced white light emission (LIWE) and examine the effects of particle size and bulk properties on the optical features of lanthanide sesquioxides. The upconversion emission colour is tunable by changes in sample packing density, laser diode intensity and continuous excitation wavelength at 808 or 980 nm up to 11 kW cm−2. The results demonstrate that the slope for the linear fit for Log ILIWEvs Log PD should not be interpreted as the number of photons in the LIWE process. The temporal dynamics and photoconductivity analysis indicate that multiphoton ionisation and avalanche processes are not involved in LIWE generation. The minor resistance oscillations (within one order of magnitude) over a timescale of seconds, along with photocurrent intensities in the nA, can be attributed to a light-to-heat mechanism induced by laser excitation. The single emitters reported here present intrinsic optical bistability coupled to temperature sensing in a wide range, 972−2542 K, with a high resolution of 0.2 K. The photophysical analysis indicates that there are two optical bistable emissions at low/high laser power densities.
{"title":"Intrinsic optical bistability and temperature sensing in the Laser–Induced Anti-Stokes broadband white light emission","authors":"Talita J.S. Ramos","doi":"10.1016/j.jlumin.2025.121655","DOIUrl":"10.1016/j.jlumin.2025.121655","url":null,"abstract":"<div><div>In this work, we provide a detailed investigation into the underlying mechanisms of laser-induced white light emission (LIWE) and examine the effects of particle size and bulk properties on the optical features of lanthanide sesquioxides. The upconversion emission colour is tunable by changes in sample packing density, laser diode intensity and continuous excitation wavelength at 808 or 980 nm up to 11 kW cm<sup>−2</sup>. The results demonstrate that the slope for the linear fit for Log I<sub>LIWE</sub> <em>vs</em> Log P<sub>D</sub> should not be interpreted as the number of photons in the LIWE process. The temporal dynamics and photoconductivity analysis indicate that multiphoton ionisation and avalanche processes are not involved in LIWE generation. The minor resistance oscillations (within one order of magnitude) over a timescale of seconds, along with photocurrent intensities in the nA, can be attributed to a light-to-heat mechanism induced by laser excitation. The single emitters reported here present intrinsic optical bistability coupled to temperature sensing in a wide range, 972−2542 K, with a high resolution of 0.2 K. The photophysical analysis indicates that there are two optical bistable emissions at low/high laser power densities.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121655"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692177","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 : 2026-01-01Epub Date: 2025-10-27DOI: 10.1016/j.jlumin.2025.121631
Reinaldo de Melo Ferreira , Nilo F. Cano , Betzabel N. Silva-Carrera , T.K. Gundu Rao , J.F. Benavente , Edwar A. Canaza , Jessica Mosqueira-Yauri , René R. Rocca , J.F.D. Chubaci
In this work, the natural fluorapophyllite crystal (KCa4Si8O20(F,OH)‧8(H2O)) has been studied by techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), thermoluminescence (TL), optical absorption (OA), and electron paramagnetic resonance (EPR). This crystal, sensitized by heat treatment at 700 °C, has four TL peaks which, when superimposed, give rise to a broad peak centered at 225 °C, and an emission band between 300 and 600 nm centered at 475 nm. The kinetic parameters of the TL peaks were determined using the Tm-Tstop and deconvolution methods. In addition, a statistical analysis of the deconvolution residue was performed to evaluate the accuracy of the deconvolution. Electron paramagnetic resonance (EPR) analysis identified the defect centers induced in the crystal by gamma radiation: a center due to V4+, and a center associated with oxygen (O− ion). The V4+ center is interpreted as a (VO2+) radical (g ≈ 1.967). The O− center is characterized by axial symmetry, and the center relates to the TL peaks from 230 to 306 °C.
{"title":"Identification of defect centers responsible for TL in fluorapophyllite crystal using EPR and optical absorption techniques","authors":"Reinaldo de Melo Ferreira , Nilo F. Cano , Betzabel N. Silva-Carrera , T.K. Gundu Rao , J.F. Benavente , Edwar A. Canaza , Jessica Mosqueira-Yauri , René R. Rocca , J.F.D. Chubaci","doi":"10.1016/j.jlumin.2025.121631","DOIUrl":"10.1016/j.jlumin.2025.121631","url":null,"abstract":"<div><div>In this work, the natural fluorapophyllite crystal (KCa<sub>4</sub>Si<sub>8</sub>O<sub>20</sub>(F,OH)‧8(H<sub>2</sub>O)) has been studied by techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), thermoluminescence (TL), optical absorption (OA), and electron paramagnetic resonance (EPR). This crystal, sensitized by heat treatment at 700 °C, has four TL peaks which, when superimposed, give rise to a broad peak centered at 225 °C, and an emission band between 300 and 600 nm centered at 475 nm. The kinetic parameters of the TL peaks were determined using the Tm-Tstop and deconvolution methods. In addition, a statistical analysis of the deconvolution residue was performed to evaluate the accuracy of the deconvolution. Electron paramagnetic resonance (EPR) analysis identified the defect centers induced in the crystal by gamma radiation: a center due to V<sup>4+</sup>, and a center associated with oxygen (O<sup>−</sup> ion). The V<sup>4+</sup> center is interpreted as a (VO<sup>2+</sup>) radical (g ≈ 1.967). The O<sup>−</sup> center is characterized by axial symmetry, and the center relates to the TL peaks from 230 to 306 °C.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121631"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145425009","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}
Three salicylaldehyde derivatives (o-STPE, m-STPE, and p-STPE) containing tetraphenylethylene (TPE) units were designed and synthesized. Their structures were characterized using 1H/13C NMR, ESI-MS, elemental analysis, and single crystal X-ray diffraction. The three compounds displayed significant aggregation-induced emission (AIE) characteristics in a mixed solution comprised of THF/H2O with increasing fraction of water. Moreover, the UV–vis and fluorescence spectra of o-STPE, m-STPE, and p-STPE upon the addition of various ions showed that they displayed an obvious selective recognition and turn-on fluorescence response to F− in THF. The stoichiometric ratios and limits of detection were determined via Job's plot and spectra titration experiments. The sensing mechanism of the three probes was due to the hydrogen bond interactions formed between F− and phenolic hydroxyl units using a combination of 1H NMR and density functional theory calculations.
{"title":"Three tetraphenylethylene-decorated salicylaldehyde derivatives for the selective detection of fluoride ions","authors":"Guo-Bao Jian , Li-Xia Chen , Chao Huang , Tao Jiang , An-Ting Zhao","doi":"10.1016/j.jlumin.2025.121662","DOIUrl":"10.1016/j.jlumin.2025.121662","url":null,"abstract":"<div><div>Three salicylaldehyde derivatives (<em>o</em>-STPE, <em>m</em>-STPE, and <em>p</em>-STPE) containing tetraphenylethylene (TPE) units were designed and synthesized. Their structures were characterized using <sup>1</sup>H/<sup>13</sup>C NMR, ESI-MS, elemental analysis, and single crystal X-ray diffraction. The three compounds displayed significant aggregation-induced emission (AIE) characteristics in a mixed solution comprised of THF/H<sub>2</sub>O with increasing fraction of water. Moreover, the UV–vis and fluorescence spectra of <em>o</em>-STPE, <em>m</em>-STPE, and <em>p</em>-STPE upon the addition of various ions showed that they displayed an obvious selective recognition and turn-on fluorescence response to F<sup>−</sup> in THF. The stoichiometric ratios and limits of detection were determined via Job's plot and spectra titration experiments. The sensing mechanism of the three probes was due to the hydrogen bond interactions formed between F<sup>−</sup> and phenolic hydroxyl units using a combination of <sup>1</sup>H NMR and density functional theory calculations.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121662"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620224","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 : 2026-01-01Epub Date: 2025-10-10DOI: 10.1016/j.jlumin.2025.121604
Jiapeng Wang , yiqi Zhuang , Rong Chen , Youquan Chen, Yu Chen, Rong Li, Guorui Fu, Xingqiang Lü
In contrast to the well-known different photophysical properties induced by geometrical isomers of neutral [Ir(C^N)3/[Ir(C^N)2(L^X)], the effect of geometrical isomerism of cationic [Ir(C^N)2(N^N)]+ on their optical property, remains very limited. Herein, using [Ir(pba)2(bpy)]+ (Hpba = 4-(2-pyridyl)benzaldehyde; bpy = 2,2-bipyridine) as the representative, its new C^C′-trans-and-N^N′-cis-dispositioned is simultaneously obtained with the traditional C^C′-cis-and-N^N′-trans-[Ir(pba)2(bpy)]+(PF6)-. Notably, through experimental/theoretical analyses, the emissive color difference (yellow-green (λem = 545 nm) versus yellow (λem = 574 nm) of the two geometrical isomers to [Ir(pba)2(bpy)]+ is confirmed to be resulted from different C^C′-cis-and-N^N′-trans-/C^C′-trans-and-N^N′-cis-disposition of the two pba-main ligands within.
{"title":"The geometrical isomerism effect of C2-symmetric cationic [Ir(C^N)2(N^N)]+ complexes [Ir(pba)2(bpy)]+(PF6)-","authors":"Jiapeng Wang , yiqi Zhuang , Rong Chen , Youquan Chen, Yu Chen, Rong Li, Guorui Fu, Xingqiang Lü","doi":"10.1016/j.jlumin.2025.121604","DOIUrl":"10.1016/j.jlumin.2025.121604","url":null,"abstract":"<div><div>In contrast to the well-known different photophysical properties induced by geometrical isomers of neutral [Ir(C^N)<sub>3</sub>/[Ir(C^N)<sub>2</sub>(L^X)], the effect of geometrical isomerism of cationic [Ir(C^N)<sub>2</sub>(N^N)]<sup>+</sup> on their optical property, remains very limited. Herein, using [Ir(pba)<sub>2</sub>(bpy)]<sup>+</sup> (Hpba = 4-(2-pyridyl)benzaldehyde; bpy = 2,2-bipyridine) as the representative, its new <em>C^C′-trans-and-N^N′-cis</em>-dispositioned is simultaneously obtained with the traditional <em>C^C′-cis-and-N^N′-trans</em>-[Ir(pba)<sub>2</sub>(bpy)]<sup>+</sup>(PF<sub>6</sub>)<sup>-</sup>. Notably, through experimental/theoretical analyses, the emissive color difference (yellow-green (<em>λ</em><sub>em</sub> = 545 nm) <em>versus</em> yellow (<em>λ</em><sub>em</sub> = 574 nm) of the two geometrical isomers to [Ir(pba)<sub>2</sub>(bpy)]<sup>+</sup> is confirmed to be resulted from different <em>C^C′-cis-and-N^N′-trans</em>-/<em>C^C′-trans-and-N^N′-cis</em>-disposition of the two pba-main ligands within.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121604"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334561","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 : 2026-01-01Epub Date: 2025-11-01DOI: 10.1016/j.jlumin.2025.121637
V.V. Evstropov, D.A. Malevskiy, M.A. Mintairov, S.A. Mintairov, N.A. Kalyuzhnyy
The modeling of the mechanisms of current flow in the p-n junction caused by recombination of two-dimensional carriers inside the quantum-well-like objects is carried out. Usually, the total current through such a p-n junction is the sum of two exponential components. The first component is determined by bimolecular recombination (between the electron and hole subbands) and its ideality factor is unit. The second component is determined by recombination through a deep background level in the quantum well and its ideality factor is two-units. Both components are fundamental by their origin. So the proposed model is applicable to devices in which currents with ideality factors A = 1 and A = 2 dominate and Auger, tunnel-trap and surface recombinations can be neglected For the pre-exponential factors (saturation currents), equations, which take into account the two-dimensional nature of the quantities related to the quantum well, are obtained. The expressions obtained for the IV characteristic for the 2D recombination are functionally similar to the well-known expressions for recombination through a bulk (matrix). In particular, the two-dimensional approach makes it possible to justify for a quantum well the concept of the "effective" band gap, the value of which is smaller than that of the corresponding bulk material. As a consequence, the pre-exponential factors always increase with quantum objects introducing into a p-n junction, and the voltage decreases at certain current. The proposed approach was experimentally confirmed by the study of an AlGaAs light-emitting diode, the heterostructure of which contained an array of InGaAs quantum wells. The experimental resistive-less IV characteristics had two components: unit and two-unit. The presence of quantum wells into the p-n junction increased the unit saturation current by 40 times, and the two-unit saturation current by 7 times.
{"title":"The current flow in the p-n junction caused by recombination in quantum wells","authors":"V.V. Evstropov, D.A. Malevskiy, M.A. Mintairov, S.A. Mintairov, N.A. Kalyuzhnyy","doi":"10.1016/j.jlumin.2025.121637","DOIUrl":"10.1016/j.jlumin.2025.121637","url":null,"abstract":"<div><div>The modeling of the mechanisms of current flow in the <em>p-n</em> junction caused by recombination of two-dimensional carriers inside the quantum-well-like objects is carried out. Usually, the total current through such a <em>p-n</em> junction is the sum of two exponential components. The first component is determined by bimolecular recombination (between the electron and hole subbands) and its ideality factor is unit. The second component is determined by recombination through a deep background level in the quantum well and its ideality factor is two-units. Both components are fundamental by their origin. So the proposed model is applicable to devices in which currents with ideality factors <em>A</em> = 1 and <em>A</em> = 2 dominate and Auger, tunnel-trap and surface recombinations can be neglected For the pre-exponential factors (saturation currents), equations, which take into account the two-dimensional nature of the quantities related to the quantum well, are obtained. The expressions obtained for the <em>IV</em> characteristic for the 2D recombination are functionally similar to the well-known expressions for recombination through a bulk (matrix). In particular, the two-dimensional approach makes it possible to justify for a quantum well the concept of the \"effective\" band gap, the value of which is smaller than that of the corresponding bulk material. As a consequence, the pre-exponential factors always increase with quantum objects introducing into a <em>p-n</em> junction, and the voltage decreases at certain current. The proposed approach was experimentally confirmed by the study of an AlGaAs light-emitting diode, the heterostructure of which contained an array of InGaAs quantum wells. The experimental resistive-less <em>IV</em> characteristics had two components: unit and two-unit. The presence of quantum wells into the <em>p-n</em> junction increased the unit saturation current by 40 times, and the two-unit saturation current by 7 times.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121637"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145475012","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 : 2026-01-01Epub Date: 2025-10-17DOI: 10.1016/j.jlumin.2025.121600
Jia Zhang , Hao Zhang , Xuanfen Zhang
Viscosity serves as a direct indicator of rheological properties in biological systems, reflecting critical microenvironmental changes that influence cellular function and tissue repair processes. To overcome current limitations in viscosity monitoring, we developed VisTrack-NIR, a molecular rotor-based near-infrared fluorescent probe capable of real-time viscosity tracking with exceptional sensitivity. The probe exhibited excellent biocompatibility and enabled distinct visualization of viscosity in both tumor and normal cells. In diabetic wound models treated with resveratrol, this probe achieved unprecedented real-time observation of viscosity reduction during the healing process, providing crucial insights into this key healing biomarker. These results indicate that VisTrack-NIR not only provides an effective approach for investigating cellular microenvironmental rheology, but also establishes a diagnostic tool for clinical monitoring of diabetic wound healing.
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Pub Date : 2026-01-01Epub Date: 2025-11-05DOI: 10.1016/j.jlumin.2025.121648
Yevhen Zlatov , Valeriy Bacherikov , Olga Teslyuk , Ivan Zheltvay , Liudmyla Ognichenko , Larisa Derkach
The effect of geometric isomerism of the ligand on the complexation and luminescence properties of dehydroacetic acid derivatives, substituted Z, E-cinnamoylpyrones with lanthanide ions was studied. It has been established that Z-isomers of 4-hydroxy-3-(4'-or 2'-halogen)-cinnamoyl-6-methylpyrone–2, regardless of the position of the halogen in the aromatic ring, form complexes with Tb(III) and Eu(III) with high luminescence intensity, and E-isomers form coordination compounds with Sc(III) ions and enhance the infrared emission of Nd(III) and Yb(III) complexes. The complexes of Eu(III) with Z, E-isomers of 4-hydroxy-3-(4-fluoro)cinnamoyl-6-methylpyrone-2 isolated in solid form differ significantly in their luminescent characteristics. The excitation spectrum of the complex with the E-isomer of the ligand occupies almost the entire UV region, extending up to 200 nm. For the Z-isomer of the ligand, the excitation spectrum has the form of a compact band with two local maxima at 280 and 325 nm.
研究了配体的几何异构对脱氢乙酸衍生物、镧系离子取代的Z， e -肉桂基吡咯酮的络合和发光性能的影响。证实了4-羟基-3-（4′-或2′-卤素）-肉桂酰-6-甲基吡啶酮- 2的z -异构体与Tb（III）和Eu（III）形成的配合物具有较高的发光强度，与e -异构体与Sc（III）离子形成的配合物增强了Nd（III）和Yb（III）配合物的红外发射。固体形式的Eu（III）与4-羟基-3-（4-氟）肉桂酰-6-甲基吡咯酮-2的Z， e异构体的配合物在发光特性上有显著差异。与配体的e -异构体的配合物的激发光谱几乎占据了整个紫外区，延伸到200nm。对于配体的z -异构体，激发光谱具有紧凑带的形式，在280和325 nm处有两个局部最大值。
{"title":"Study of luminescence properties of lanthanide complexes of dehydroacetic acid derivatives","authors":"Yevhen Zlatov , Valeriy Bacherikov , Olga Teslyuk , Ivan Zheltvay , Liudmyla Ognichenko , Larisa Derkach","doi":"10.1016/j.jlumin.2025.121648","DOIUrl":"10.1016/j.jlumin.2025.121648","url":null,"abstract":"<div><div>The effect of geometric isomerism of the ligand on the complexation and luminescence properties of dehydroacetic acid derivatives, substituted Z, E-cinnamoylpyrones with lanthanide ions was studied. It has been established that Z-isomers of 4-hydroxy-3-(4'-or 2'-halogen)-cinnamoyl-6-methylpyrone–2, regardless of the position of the halogen in the aromatic ring, form complexes with Tb(III) and Eu(III) with high luminescence intensity, and E-isomers form coordination compounds with Sc(III) ions and enhance the infrared emission of Nd(III) and Yb(III) complexes. The complexes of Eu(III) with Z, E-isomers of 4-hydroxy-3-(4-fluoro)cinnamoyl-6-methylpyrone-2 isolated in solid form differ significantly in their luminescent characteristics. The excitation spectrum of the complex with the E-isomer of the ligand occupies almost the entire UV region, extending up to 200 nm. For the Z-isomer of the ligand, the excitation spectrum has the form of a compact band with two local maxima at 280 and 325 nm.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121648"},"PeriodicalIF":3.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145525989","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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