Pub Date : 2025-11-25DOI: 10.1016/j.jlumin.2025.121674
M. Korzhik , V. Smyslova , A. Bondarau , V. Dubov , E. Borisevich , K. Ivanovskikh , P. Karpuyk , I. Komendo , V. Pustovarov , D. Tavrunov , Y. Talochka
The radioluminescence and phosphorescence of Gd1.5Y1.5Al2Ga3O12 transparent scintillation ceramics doped with Pr3+, Ce3+, or their combination, as well as co-doped with Mg2+ were investigated for the first time. The results demonstrate that phosphorescence, which is a well-known phenomenon in Pr3+-doped aluminum-gallium garnets, can be effectively suppressed by introduction of Ce3+ ions and a small concentration of Mg2+ in the ceramics. The yield of radioluminescence of Ce3+ and Pr3+ co-doped ceramics was found to exceed a little that of ceramics doped solely with Ce3+, showing a low dependence on dopant concentration. The study also reveals that the Gd sublattice plays a crucial role in energy transfer between doping ions. Mg2+ co-doping acts similarly to the aluminum-gallium garnets solely doped with Ce; it suppresses phosphorescence in Pr3+-doped polycationic garnets resulting in sufficient diminishing of the afterglow level. Developed materials maintain high scintillation efficiency which makes them promising for applications in radiation detection.
{"title":"Mastering the suppression of the phosphorescence of Pr-doped aluminum-gallium Gd1.5Y1.5Al2Ga3O12 ceramic scintillators","authors":"M. Korzhik , V. Smyslova , A. Bondarau , V. Dubov , E. Borisevich , K. Ivanovskikh , P. Karpuyk , I. Komendo , V. Pustovarov , D. Tavrunov , Y. Talochka","doi":"10.1016/j.jlumin.2025.121674","DOIUrl":"10.1016/j.jlumin.2025.121674","url":null,"abstract":"<div><div>The radioluminescence and phosphorescence of Gd<sub>1.5</sub>Y<sub>1.5</sub>Al<sub>2</sub>Ga<sub>3</sub>O<sub>12</sub> transparent scintillation ceramics doped with Pr<sup>3+</sup>, Ce<sup>3+</sup>, or their combination, as well as co-doped with Mg<sup>2+</sup> were investigated for the first time. The results demonstrate that phosphorescence, which is a well-known phenomenon in Pr<sup>3+</sup>-doped aluminum-gallium garnets, can be effectively suppressed by introduction of Ce<sup>3+</sup> ions and a small concentration of Mg<sup>2+</sup> in the ceramics. The yield of radioluminescence of Ce<sup>3+</sup> and Pr<sup>3+</sup> co-doped ceramics was found to exceed a little that of ceramics doped solely with Ce<sup>3+</sup>, showing a low dependence on dopant concentration. The study also reveals that the Gd sublattice plays a crucial role in energy transfer between doping ions. Mg<sup>2+</sup> co-doping acts similarly to the aluminum-gallium garnets solely doped with Ce; it suppresses phosphorescence in Pr<sup>3+</sup>-doped polycationic garnets resulting in sufficient diminishing of the afterglow level. Developed materials maintain high scintillation efficiency which makes them promising for applications in radiation detection.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121674"},"PeriodicalIF":3.6,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145610620","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 : 2025-11-25DOI: 10.1016/j.jlumin.2025.121676
Kiran R , Nandini P S , S. Masilla Moses Kennedy , Princy A , M.I. Sayyed , Sudha D. Kamath
Ho3+ doped Ca2MgWO6 phosphors were prepared via the solid-state reaction and systematically investigated to study their structural, optical, and multifunctional properties. XRD and Rietveld refinement confirmed the formation of a monoclinic double perovskite phase, while SEM analysis revealed irregularly shaped, micron-sized particles with uniform elemental distribution. Under 454 nm excitation, the phosphors exhibited intense green emission at 546 nm, along with weaker red (653 nm) and near-infrared (757 nm) bands, yielding CIE chromaticity coordinates in the green region with nearly 100 % colour purity. The optimum Ho3+ concentration was identified as 2 mol%, with quenching beyond this point governed by dipole-dipole interactions. Diffuse reflectance spectroscopy and Tauc’s analysis indicated a direct band gap of 3.32 eV, and the Judd-Ofelt analyses revealed the covalent nature and significant distortion around Ho3+ sites. Temperature-dependent photoluminescence revealed a quenching temperature of 398.43 K. Temperature sensing behaviour was analyzed through polynomial fitting, demonstrating maximum relative sensitivities of 0.24 % K−1 and 0.23 % K−1 at 498 K. These results highlight Ca2MgWO6:Ho3+ as a robust candidate for optical thermometry and green LED applications.
{"title":"Multifunctional applications of Ho3+ doped Ca2MgWO6 phosphors: A comprehensive optical, structural, temperature sensing, and Judd-Ofelt analyses","authors":"Kiran R , Nandini P S , S. Masilla Moses Kennedy , Princy A , M.I. Sayyed , Sudha D. Kamath","doi":"10.1016/j.jlumin.2025.121676","DOIUrl":"10.1016/j.jlumin.2025.121676","url":null,"abstract":"<div><div>Ho<sup>3+</sup> doped Ca<sub>2</sub>MgWO<sub>6</sub> phosphors were prepared via the solid-state reaction and systematically investigated to study their structural, optical, and multifunctional properties. XRD and Rietveld refinement confirmed the formation of a monoclinic double perovskite phase, while SEM analysis revealed irregularly shaped, micron-sized particles with uniform elemental distribution. Under 454 nm excitation, the phosphors exhibited intense green emission at 546 nm, along with weaker red (653 nm) and near-infrared (757 nm) bands, yielding CIE chromaticity coordinates in the green region with nearly 100 % colour purity. The optimum Ho<sup>3+</sup> concentration was identified as 2 mol%, with quenching beyond this point governed by dipole-dipole interactions. Diffuse reflectance spectroscopy and Tauc’s analysis indicated a direct band gap of 3.32 eV, and the Judd-Ofelt analyses revealed the covalent nature and significant distortion around Ho<sup>3+</sup> sites. Temperature-dependent photoluminescence revealed a quenching temperature of 398.43 K. Temperature sensing behaviour was analyzed through polynomial fitting, demonstrating maximum relative sensitivities of 0.24 % K<sup>−1</sup> and 0.23 % K<sup>−1</sup> at 498 K. These results highlight Ca<sub>2</sub>MgWO<sub>6</sub>:Ho<sup>3+</sup> as a robust candidate for optical thermometry and green LED applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"290 ","pages":"Article 121676"},"PeriodicalIF":3.6,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145622801","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 : 2025-11-25DOI: 10.1016/j.jlumin.2025.121673
Changbo Deng , Yu Zhang , Dachuan Zhang , Zhulu Xie , Qiuping Huang , Zhengping Fu , Yalin Lu
Direct optical patterning of perovskite colloidal quantum dots (QDs) mediated by surface chemistry has emerged as a critical focus for new display technologies. However, the instability of weakly bound ligands on QD surfaces significantly restricts their practical applications. To address this challenge, we propose a novel and straightforward strategy that utilizes the strongly binding zwitterionic photocrosslinkable ligand 2-methacryloyloxyethyl phosphorylcholine (MPC) via ligand exchange, enabling direct optical patterning of CsPbBr3 QDs without requiring an inert environment or precise ultraviolet (UV) light intensity control. The MPC ligand exhibits dual functionality: it effectively passivates QD surface defects, achieving a photoluminescence quantum yield (PLQY) of 83.8 ± 1.4 % for CsPbBr3 QD colloidal solutions, while simultaneously enabling direct optical patterning in ambient air. This patterning mechanism relies on methacrylate groups that initiate polymerization upon UV irradiation, forming a robust crosslinked network. The resulting patterns exhibit a high PLQY of 72.5 ± 5.9 %. Additionally, theoretical calculations reveal that the planar orientation of MPC ligands on the QD surface minimizes inter-QD spacing, promoting the formation of dense and smooth films. This innovative approach not only enhances the optical performance of CsPbBr3 QDs but also paves the way for their practical implementation in high-quality, vivid image displays.
{"title":"Direct optical patterning of CsPbBr3 quantum dots with zwitterionic photocrosslinkable ligand","authors":"Changbo Deng , Yu Zhang , Dachuan Zhang , Zhulu Xie , Qiuping Huang , Zhengping Fu , Yalin Lu","doi":"10.1016/j.jlumin.2025.121673","DOIUrl":"10.1016/j.jlumin.2025.121673","url":null,"abstract":"<div><div>Direct optical patterning of perovskite colloidal quantum dots (QDs) mediated by surface chemistry has emerged as a critical focus for new display technologies. However, the instability of weakly bound ligands on QD surfaces significantly restricts their practical applications. To address this challenge, we propose a novel and straightforward strategy that utilizes the strongly binding zwitterionic photocrosslinkable ligand 2-methacryloyloxyethyl phosphorylcholine (MPC) via ligand exchange, enabling direct optical patterning of CsPbBr<sub>3</sub> QDs without requiring an inert environment or precise ultraviolet (UV) light intensity control. The MPC ligand exhibits dual functionality: it effectively passivates QD surface defects, achieving a photoluminescence quantum yield (PLQY) of 83.8 ± 1.4 % for CsPbBr<sub>3</sub> QD colloidal solutions, while simultaneously enabling direct optical patterning in ambient air. This patterning mechanism relies on methacrylate groups that initiate polymerization upon UV irradiation, forming a robust crosslinked network. The resulting patterns exhibit a high PLQY of 72.5 ± 5.9 %. Additionally, theoretical calculations reveal that the planar orientation of MPC ligands on the QD surface minimizes inter-QD spacing, promoting the formation of dense and smooth films. This innovative approach not only enhances the optical performance of CsPbBr<sub>3</sub> QDs but also paves the way for their practical implementation in high-quality, vivid image displays.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121673"},"PeriodicalIF":3.6,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620226","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}
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":"2025-11-25","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 : 2025-11-24DOI: 10.1016/j.jlumin.2025.121672
Guoquan Qian , Hongxi Lin , Guowu Tang , Minbo Wu , Xiangyang Song , Jianhui Liu , Meihui Zhang , Shuke An , Qi Qian
Physical and spectroscopic properties of the Er3+/Tm3+/Ho3+ triply-doped germanate glass were investigated. Broadband 2 μm emission with a full width at half maximum (FWHM) of 340 nm was obtained under 976 nm excitation. In addition, the measured lifetime of the Ho3+: 5I7 level is 5.27 ms. What is more, Er3+/Tm3+/Ho3+ triply-doped germanate glass core fibers with silicate cladding were drawn by the rod-in-tube technique. Notably, broadband 2 μm amplified spontaneous emission (ASE) with a FWHM of 312 nm was achieved. These results suggest that the as-drawn glass fiber is a promising candidate for broadband tunable fiber laser.
{"title":"Broadband 2 μm amplified spontaneous emission of Er3+/Tm3+/Ho3+ triply-doped germanate glass fiber","authors":"Guoquan Qian , Hongxi Lin , Guowu Tang , Minbo Wu , Xiangyang Song , Jianhui Liu , Meihui Zhang , Shuke An , Qi Qian","doi":"10.1016/j.jlumin.2025.121672","DOIUrl":"10.1016/j.jlumin.2025.121672","url":null,"abstract":"<div><div>Physical and spectroscopic properties of the Er<sup>3+</sup>/Tm<sup>3+</sup>/Ho<sup>3+</sup> triply-doped germanate glass were investigated. Broadband 2 μm emission with a full width at half maximum (FWHM) of 340 nm was obtained under 976 nm excitation. In addition, the measured lifetime of the Ho<sup>3+</sup>: <sup>5</sup>I<sub>7</sub> level is 5.27 ms. What is more, Er<sup>3+</sup>/Tm<sup>3+</sup>/Ho<sup>3+</sup> triply-doped germanate glass core fibers with silicate cladding were drawn by the rod-in-tube technique. Notably, broadband 2 μm amplified spontaneous emission (ASE) with a FWHM of 312 nm was achieved. These results suggest that the as-drawn glass fiber is a promising candidate for broadband tunable fiber laser.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121672"},"PeriodicalIF":3.6,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620225","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":"2025-11-21","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 : 2025-11-20DOI: 10.1016/j.jlumin.2025.121670
Jabir Hakami , M.B. Coban , H. Aydin , U.H. Kaynar , M. Sharahili , O. Madkhali , D. Somaily , N. Can
Eu3+-doped borates stand out as promising red-emitting phosphors owing to their stable crystal structures and sharp luminescence features. In this study, we investigate LiCa4O(BO3)3:Eu3+ and explore how additional doping with K+ and Na + ions influences the symmetry of Eu3+ sites, photoluminescence efficiency, and thermal stability. All synthesized samples exhibit a single-phase orthorhombic structure. Photoluminescence spectra revealed prominent Eu3+ emissions, dominated by the 5D0→7F2 transition at 613 nm. Remarkably, co-doping with alkali metals enhances the long-wavelength emission (∼705 nm), contributing to deeper red color output. Judd–Ofelt analysis showed that Na+-doped and Eu-only samples maintained Ω4-dominant profiles, indicating a relatively symmetric local environment. In contrast, K+ doping significantly increased the Ω2/Ω4 ratio, suggesting a more asymmetric crystal field and stronger electric-dipole transitions. Lifetime and nonradiative decay measurements supported these findings, showing that K+ improved radiative efficiency, while Na+ preserved structural rigidity with moderate trade-offs in emission strength. Thermal quenching studies revealed activation energies of ∼0.36 eV for Eu-only samples, decreasing to ∼0.15 eV with alkali co-doping, confirming enhanced thermal stability. Chromaticity data indicated tunable red emission, where K+ contributed to higher color purity and Na+ offered better thermal color retention. These insights underline how alkali ions fine-tune site symmetry and emission behavior, providing useful guidance for designing advanced Eu3+-based borate phosphors for LED and optical sensing applications.
{"title":"Structural modulation and Judd–Ofelt-guided luminescence enhancement in Eu3+-doped LiCa4O(BO3)3 via dual-alkali co-doping","authors":"Jabir Hakami , M.B. Coban , H. Aydin , U.H. Kaynar , M. Sharahili , O. Madkhali , D. Somaily , N. Can","doi":"10.1016/j.jlumin.2025.121670","DOIUrl":"10.1016/j.jlumin.2025.121670","url":null,"abstract":"<div><div>Eu<sup>3+</sup>-doped borates stand out as promising red-emitting phosphors owing to their stable crystal structures and sharp luminescence features. In this study, we investigate LiCa<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub>:Eu<sup>3+</sup> and explore how additional doping with K<sup>+</sup> and Na <sup>+</sup> ions influences the symmetry of Eu<sup>3+</sup> sites, photoluminescence efficiency, and thermal stability. All synthesized samples exhibit a single-phase orthorhombic structure. Photoluminescence spectra revealed prominent Eu<sup>3+</sup> emissions, dominated by the <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> transition at 613 nm. Remarkably, co-doping with alkali metals enhances the long-wavelength emission (∼705 nm), contributing to deeper red color output. Judd–Ofelt analysis showed that Na<sup>+</sup>-doped and Eu-only samples maintained Ω<sub>4</sub>-dominant profiles, indicating a relatively symmetric local environment. In contrast, K<sup>+</sup> doping significantly increased the Ω<sub>2</sub>/Ω<sub>4</sub> ratio, suggesting a more asymmetric crystal field and stronger electric-dipole transitions. Lifetime and nonradiative decay measurements supported these findings, showing that K<sup>+</sup> improved radiative efficiency, while Na<sup>+</sup> preserved structural rigidity with moderate trade-offs in emission strength. Thermal quenching studies revealed activation energies of ∼0.36 eV for Eu-only samples, decreasing to ∼0.15 eV with alkali co-doping, confirming enhanced thermal stability. Chromaticity data indicated tunable red emission, where K<sup>+</sup> contributed to higher color purity and Na<sup>+</sup> offered better thermal color retention. These insights underline how alkali ions fine-tune site symmetry and emission behavior, providing useful guidance for designing advanced Eu<sup>3+</sup>-based borate phosphors for LED and optical sensing applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121670"},"PeriodicalIF":3.6,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620223","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}
Samples of KCaY(PO4)2 (KCYP) polycrystalline powders doped with 0.05–2 % Pr3+ ions were synthesized by high-temperature solid-state reaction, revealing a hexagonal crystal structure. The optical properties of KCYP:Pr3+ were investigated over a wide VUV-Vis range. Effect of the temperature on the spectroscopic properties of KCYP:Pr3+ were examined from 80K to 770K. A sophisticated experimental setup utilizing synchrotron radiation was employed to record the excitation and luminescence spectra in the VUV spectral range. UVC up-conversion emission excited at 444 nm, was observed in the 240–310 nm spectral range, with a maximum at 255 nm. The up-conversion emission in the KCYP:Pr3+ polycrystal was found to be due to excited state absorption (ESA). These findings provide deeper insight into the influence of the KCaY(PO4)2 lattice on the optical properties of praseodymium in the VUV-Vis spectral regions. The obtained up-conversion emission in the UVC range corresponds well to radiation with disinfectant properties for the destruction of bacteria and viruses (220–280 nm).
{"title":"UVC up-conversion and luminescent properties of KCaY(PO4)2:Pr3+ phosphor","authors":"Olha Bezkrovna , Radosław Lisiecki , Vasyl Kinzhybalo , Nadiia Rebrova , Patrycja Zdeb-Stańczykowska , Przemysław Jacek Dereń","doi":"10.1016/j.jlumin.2025.121671","DOIUrl":"10.1016/j.jlumin.2025.121671","url":null,"abstract":"<div><div>Samples of KCaY(PO<sub>4</sub>)<sub>2</sub> (KCYP) polycrystalline powders doped with 0.05–2 % Pr<sup>3+</sup> ions were synthesized by high-temperature solid-state reaction, revealing a hexagonal crystal structure. The optical properties of KCYP:Pr<sup>3+</sup> were investigated over a wide VUV-Vis range. Effect of the temperature on the spectroscopic properties of KCYP:Pr<sup>3+</sup> were examined from 80K to 770K. A sophisticated experimental setup utilizing synchrotron radiation was employed to record the excitation and luminescence spectra in the VUV spectral range. UVC up-conversion emission excited at 444 nm, was observed in the 240–310 nm spectral range, with a maximum at 255 nm. The up-conversion emission in the KCYP:Pr<sup>3+</sup> polycrystal was found to be due to excited state absorption (ESA). These findings provide deeper insight into the influence of the KCaY(PO<sub>4</sub>)<sub>2</sub> lattice on the optical properties of praseodymium in the VUV-Vis spectral regions. The obtained up-conversion emission in the UVC range corresponds well to radiation with disinfectant properties for the destruction of bacteria and viruses (220–280 nm).</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"289 ","pages":"Article 121671"},"PeriodicalIF":3.6,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145576647","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 : 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":"2025-11-19","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 : 2025-11-17DOI: 10.1016/j.jlumin.2025.121668
Rongxian Huang , Hang Zhang , Qiguang Li , Heng Zhang , Yaru Liang , Xu Teng
In recent years, nucleic acid amplification techniques (NAATs) and functional nucleic acids (FNAs) have facilitated efficient enrichment and signal transduction of trace nucleic acid biomarkers through specific recognition and cascade amplification mechanisms. Their innovative integration with chemiluminescent (CL) sensing systems has significantly enhanced the sensitivity and specificity of detection systems. As a powerful analytical technique, CL is characterized by its high sensitivity, broad dynamic range, inherently low background signal, and resistance to autofluorescence interference. This review systematically describes several widely used CL techniques based on NAATs and FNAs, elucidating mechanisms and performance characteristics, with particular emphasis on novel construction strategies for CL techniques based on NAATs and FNAs. Moreover, we present an overview of recent advances in CL techniques based on NAATs and FNAs for applications in biomedicine, food safety, and environmental pollution. Consequently, a concise discussion summarizes the strengths and limitations of CL techniques based on NAATs and FNAs and provides insights into future directions for their development.
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