Journal of Luminescence最新文献

{"title":"Enhancing efficiency of blue thermally activated delayed fluorescence organic light-emitting device using a high refractive index material-based light extraction layer","authors":"Ji-Sung Lee ,&nbsp;Jun-Young Park ,&nbsp;Jian Cheng Bi ,&nbsp;Seonghyeon Park ,&nbsp;Junwoo Kil ,&nbsp;Kyo-Cheol Kang ,&nbsp;Sangpil Hwang ,&nbsp;Ji-Hyeon Kwon ,&nbsp;Junbeom Song ,&nbsp;Hyejung Lim ,&nbsp;Byeong-Kwon Ju","doi":"10.1016/j.jlumin.2025.121399","DOIUrl":"10.1016/j.jlumin.2025.121399","url":null,"abstract":"<div><div>A high-refractive-index periodic hole structure based on silicon nitride (Si₃N₄) was incorporated into thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) to improve optical efficiency. Due to its high refractive index, Si₃N₄ serves as an effective optical scattering medium, enhancing light extraction in OLEDs.</div><div>The high-refractive-index structure (HRS) was achieved through laser interference lithography (LIL), which defined a periodic pattern in a photo-resist (PR) layer. This patterned PR layer subsequently functioned as an etch mask, allowing direct replication of the nanostructures onto the underlying Si₃N₄ layer. Compared to conventional patterning methods, LIL provides higher precision and faster processing, making it a cost-effective solution for large-area nanoscale fabrication with accurate structural control.</div><div>Key parameters affecting the LIL, development, and reactive-ion etching (RIE) processes were systematically investigated. These included the half-angle between interfering beams, exposure dosage, volume ratio of PR-to-thinner, development time, volume ratio of developer with deionized water, and etching duration—all of which impact the final structure.</div><div>To enhance light extraction efficiency at a wavelength of 480 nm, a finite-difference time-domain (FDTD) simulation was utilized to fine-tune the HRS dimensions. The resulting optimized HRS significantly enhanced device performance, increasing the external quantum efficiency (EQE) by 14.58 %, current efficiency by 37.48 %, and power efficiency by 38.37 %.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121399"},"PeriodicalIF":3.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611679","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}

{"title":"Optimized electrodeposition of CuSCN on ZnO nanorods arrays for high-performance self-powered ultraviolet photodetectors","authors":"Shaobo Shi ,&nbsp;Shubin Li ,&nbsp;Yanjie Su ,&nbsp;Kuifeng Zhu ,&nbsp;Lu Jiao ,&nbsp;Jianping Xu ,&nbsp;Lan Li","doi":"10.1016/j.jlumin.2025.121395","DOIUrl":"10.1016/j.jlumin.2025.121395","url":null,"abstract":"<div><div>Self-powered ultraviolet (UV) photodetectors (PDs) based on n-ZnO nanorod arrays (NRs)/p-CuSCN heterojunctions were fabricated through a controlled electrodeposition process. ZnO NRs were hydrothermally grown on FTO substrates, followed by electrochemical deposition of CuSCN at 0 °C and room temperature (RT) for varying durations (300−1800 s). Structural characterization revealed that RT deposition promoted uniform CuSCN coverage with improved crystallinity, while 0 °C deposition resulted in sparse, impurity-containing grains. The optimized RT deposited devices (1800 s) exhibited a type-II heterojunction with an enhanced interfacial area, facilitating efficient charge separation under UV illumination (350 nm) in the absence of external bias. Key performance metrics included a high photoresponsivity of 1.57 A/W and fast response times, attributed to the built-in electric field at the ZnO/CuSCN interface. These results highlight the critical role of deposition temperature and time in tailoring heterojunction properties for self-powered optoelectronic applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121395"},"PeriodicalIF":3.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562792","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}

{"title":"Judd–Ofelt analysis and luminescence studies of Eu3+: La(OH)3 nanophosphors synthesized via microwave enabled co-precipitation","authors":"Jifi Jose,&nbsp;Sajan Thomas,&nbsp;Neekha Deen Abraham,&nbsp;Ann V. Lizbathu,&nbsp;Bibily Baby,&nbsp;P.R. Biju,&nbsp;Cyriac Joseph","doi":"10.1016/j.jlumin.2025.121398","DOIUrl":"10.1016/j.jlumin.2025.121398","url":null,"abstract":"<div><div>An investigation on the structural and photoluminescent properties of La(OH)₃:xEu³⁺ phosphors synthesized by microwave assisted co-precipitation method and the evaluation of spectroscopic parameters has been reported. Structural, morphological, and optical studies were conducted using XRD, FTIR, SEM, EDAX, TEM and photoluminescence analysis. The samples annealed at 700 °C were crystallized into hexagonal phase, devoid of any impurities. Emission spectra reveal characteristic Eu³⁺ emission peaks with predominance in the red spectral region, displaying CIE colour coordinates close to commercially available red phosphors. The spectroscopic properties of the prepared phosphor material were investigated in detail on the basis of Judd-Ofelt analysis. The observed trend of Ω₂ &gt; Ω₄ (JO intensity parameters) aligns with the higher intensity of ⁵D₀→⁷F₂ electric dipole transition in the emission spectra and hence confirms asymmetric site occupancy of Eu³⁺ ions in the host matrix. The relatively high values of radiative parameters (derived from JO intensity parameters) - especially branching ratio, stimulated emission cross-section and gain bandwidth for major Eu³⁺ transitions substantiate the applicability of europium doped lanthanum hydroxide nanophosphors in solid state lighting, lasing, optical amplifiers, etc. Thus, the study confirms the potential and relevance of prepared phosphor as a promising candidate for NUV/UV excited red emitter for lighting and display applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121398"},"PeriodicalIF":3.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588717","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}

{"title":"High thermal stability Gd5-x-ySi2BO13:xTb3+, yEu3+ phosphors achieve color tunable emission through Tb3+-Eu3+ energy transfer","authors":"Xiaoyu Xing,&nbsp;Yukun Liu,&nbsp;Yangai Liu,&nbsp;Ruiyu Mi,&nbsp;Lefu Mei","doi":"10.1016/j.jlumin.2025.121389","DOIUrl":"10.1016/j.jlumin.2025.121389","url":null,"abstract":"<div><div>A series of Gd_5-<em>x</em>Si₂BO₁₃: <em>x</em>RE³⁺ (Tb³⁺, Eu³⁺, Tb³⁺/Eu³⁺) phosphors were successfully synthesized using high-temperature solid-state method. Color tunable single-phase phosphors were obtained through energy transfer between Tb³⁺ and Eu³⁺. The phase structure, luminescence characteristics, and energy transfer mechanism of the obtained fluorescent powder were systematically studied. The energy transfer (ET) process from Tb³⁺ to Eu³⁺ was determined to occur through exchange interactions. By changing the Tb/Eu doping concentration ratio, multi-color luminescence can be achieved under 377 nm light excitation, with emission colors adjusted from green and orange to red. The comprehensive emission intensity of Gd_4.42Si₂BO₁₃:0.55Tb³⁺, 0.03Eu³⁺ at 150 °C was 87.73 % of that at room temperature, the activation energy is 0.20 eV, indicating good thermal stability. Finally, the potential applications of the samples in the fields of lighting and anti-counterfeiting were explored. Encapsulate the synthesized Gd_4.42Si₂BO₁₃:0.55Tb³⁺, 0.03Eu³⁺ phosphors in commercial w-LEDs for actual performance testing. Ra is 90.6, CCT is 3441 K, and the light source performance is good. Using screen printing technology, Gd_4.42Si₂BO₁₃:0.55Tb³⁺, 0.03Eu³⁺ phosphors were prepared into anti-counterfeiting ink, and optical anti-counterfeiting patterns were made on glass. The pattern will not be visible when placed in a white environment but will emit yellow and red fluorescence under 365 nm and 395 nm UV excitation, respectively. The results indicate that Gd_{5-<em>x</em>-<em>y</em>}Si₂BO₁₃:<em>x</em>Tb³⁺, <em>y</em>Eu³⁺ is a multi-color tunable single-phase fluorescent powder with good luminescence performance and thermal stability, which can be applied in the field of ultraviolet excited w-LED and has potential application value in the field of optical anti-counterfeiting.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121389"},"PeriodicalIF":3.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605465","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}

{"title":"The enhanced color conversion of the silver NPs-doped quantum dots film","authors":"Weihao Wan ,&nbsp;Zhuonan Liu ,&nbsp;Peiquan Yu ,&nbsp;Jianbo Xiao ,&nbsp;Yujie Tao ,&nbsp;Qing Zhao ,&nbsp;Xiaoping Huang","doi":"10.1016/j.jlumin.2025.121394","DOIUrl":"10.1016/j.jlumin.2025.121394","url":null,"abstract":"<div><div>Quantum dots (QDs) are recognized as fundamental key components in micro-LED color conversion systems, serving as critical enablers for high-fidelity full-color displays. Silver nanoparticles (Ag NPs) exhibit surface plasmon resonance effects under photoexcitation, which can be utilized to enhance QDs color conversion for micro-LED. In this paper, the incorporation of SiO₂-encapsulated Ag NPs (Ag NPs@SiO₂) into CdSe QDs inks with varying mass ratios enabled quantitative evaluation of photoluminescence quantum yield (PLQY) enhancement through comparative spectroscopy investigation. Experimental measurements and numerical simulations with multiple concentration gradients of the mixed QDs solution jointly validated the nonlinear field enhancement trend. The spin-coated composite film prepared by mixing 10 μL of Ag NPs@SiO₂ aqueous solution (0.1 mg/mL) with 1 mL of CdSe QDs inks (1.2 g/mL) in Sample 6 demonstrated an optimal color-conversion efficiency enhancement, achieving a remarkable improvement exceeding 20 %. Based on the optimal ratio between Ag NPs@SiO₂ aqueous solution and CdSe QDs inks, blade-coating samples were fabricated by incorporating 20 μL Ag NPs@SiO₂ into 2 mL CdSe QDs inks. The resultant devices exhibited a fluorescence enhancement of 7 % with an external quantum efficiency (EQE) of 22.6 %. To improve the dispersion and uniformity of particles in the solution, 1 mL of 5 % CdSe QDs inks and 1 mL of 1 mg/mL Ag NPs@SiO₂ ethanol solution were mixed for the blade-coating samples. The fluorescence enhancement of blade coating films with the mixed QDs ethanol solution reaches 28.73 %, and the EQE reaches 23.4 %. And, the experimental results exhibited a strong congruence with the FDTD simulation results. Overall, the findings in this paper demonstrated a technical viability of plasmon-enhanced micro-LED systems for next-generation displays, establishing a materials engineering framework with cross-disciplinary implications in optoelectronics and nanophotonics.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121394"},"PeriodicalIF":3.3,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563938","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}

{"title":"Characterization and energy transfer of Sm3+/Tb3+ co-doped ZnO elaborated by auto-combustion method","authors":"Demba Camara ,&nbsp;Sana Fridjine ,&nbsp;Chaker Bouzidi","doi":"10.1016/j.jlumin.2025.121391","DOIUrl":"10.1016/j.jlumin.2025.121391","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Zinc oxide undoped and co-doped with (Sm&lt;sup&gt;3+&lt;/sup&gt;, Tb&lt;sup&gt;3+&lt;/sup&gt;), were successfully obtained through an auto-combustion synthesis process. The optical behaviors of these materials were analyzed to determine the impact of Sm&lt;sup&gt;3+&lt;/sup&gt;/Tb&lt;sup&gt;3+&lt;/sup&gt; incorporation. The structural characterization by X-ray diffraction (XRD) revealed that the samples crystallize in a hexagonal wurtzite phase. The Judd-Ofelt analysis was applied to the absorption spectra of Sm&lt;sup&gt;3+&lt;/sup&gt; (4 &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) ions to further investigate their optical properties. This allowed for the determination of the three phenomenological parameters (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;6&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), from which theoretical radiative properties were derived. It was found that the JO parameters follow the order: &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &gt; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;6&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &gt;&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Photoluminescence (PL) studies revealed the presence of characteristic transitions of Sm&lt;sup&gt;3+&lt;/sup&gt; ions, with a prominent emission at &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;7/2&lt;/sub&gt; (600 nm). Energy transfer from Tb&lt;sup&gt;3+&lt;/sup&gt; ions to Sm&lt;sup&gt;3+&lt;/sup&gt; ions was evidenced through PL analysis and the Judd-Ofelt method. An improvement was observed in the values of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;Δ&lt;/mo&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), as well as in the measured lifetime (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;τ&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;1.35&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) of the &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;7/2&lt;/sub&gt;transition after the addition of Tb&lt;sup&gt;3+&lt;/sup&gt; ions. A noticeable increase in radiative lifetime (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;τ&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;1.50&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) was recorded following the addition of Tb&lt;sup&gt;3+&lt;/sup&gt;. Enhancement of photoluminescence intensity was also observed for the transitions &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;5/2&lt;/sub&gt; (562 nm), &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;7/2&lt;/sub&gt; (600 nm), &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;9/2&lt;/sub&gt; (650 nm) and &lt;sup&gt;4&lt;/sup&gt;G&lt;sub&gt;5/2&lt;/sub&gt; → &lt;sup&gt;6&lt;/sup&gt;H&lt;sub&gt;11/2&lt;/sub&gt; (700 nm), along with an improvement in quantum efficiency (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;90&lt;/mn&gt;&lt;mo&gt;%&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) for the &lt;sup&gt;4&lt;/sup&gt;G&lt;s","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121391"},"PeriodicalIF":3.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572475","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}

{"title":"Structural and luminescent properties of Eu3+ containing barium and zinc borate red phosphor glasses","authors":"Suruchi Sharma ,&nbsp;Atul Khanna ,&nbsp;Margarita Milanova ,&nbsp;Aneliya Yordanova ,&nbsp;Reni Iordanova ,&nbsp;Daniel Yang ,&nbsp;Banghao Chen","doi":"10.1016/j.jlumin.2025.121393","DOIUrl":"10.1016/j.jlumin.2025.121393","url":null,"abstract":"<div><div>Eu³⁺ incorporated barium borate and zinc borate glasses of composition: (35−0.50x)BaO-(65−0.50x)B₂O₃-xEu₂O₃ and (50−0.50x)ZnO-(50−0.50x)B₂O₃-xEu₂O₃ (x = 0–5 mol%) were synthesized by the melt quenching in the temperature range: 1200–1400 °C. Structural, thermal and optical properties of glasses were studied by X-ray diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Colorimetry (DSC), ¹¹B Magic Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR), Vickers’ hardness tests, UV–visible and photoluminescence studies. The density of barium borate and zinc borate glass samples increase from 3.614 to 3.891(±0.005) g·cm⁻³ and from 3.393 to 3.804(±0.005) g·cm⁻³ respectively, upon increasing Eu₂O₃ concentration from 1 to 5 mol%. The glass transition temperature of both series increases with increasing Eu₂O₃ concentration. Raman and FTIR spectra show stretching and bending vibrations of B-O-B linkages in the BO₄ and BO₃ structural units. The hardness of barium borate and zinc borate glasses are 4.91(±0.21) and 4.63(±0.18) GPa respectively. The concentration of tetrahedral borons in barium borate and zinc borate glasses are 46(±1) % and 29(±1) % respectively. UV–visible spectra of glasses exhibit absorption bands due to transitions of Eu³⁺ from the ^<em>7</em><em>F</em>_<em>0,1</em> ground states to the excited states of Eu³⁺. The emission spectra of the samples containing Eu₂O₃ were measured at an excitation wavelength of 392 nm. Glasses emit intense red light and quenching of luminescence is observed at 3 and 4 mol% Eu₂O₃ concentration in barium borate and zinc borate glasses respectively. The emission intensity of barium borate glasses is found to be significantly higher than that of zinc borate glasses.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121393"},"PeriodicalIF":3.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572472","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}

{"title":"Radio- and optically stimulated luminescence of Dy-doped MgB4O7 phosphor","authors":"A. Di Rocco ,&nbsp;E. Cruz-Zaragoza ,&nbsp;E. Camarillo-García ,&nbsp;M. Lester ,&nbsp;J. Marcazzó","doi":"10.1016/j.jlumin.2025.121390","DOIUrl":"10.1016/j.jlumin.2025.121390","url":null,"abstract":"<div><div>The radioluminescence (RL) and optically stimulated luminescence (OSL) properties of dysprosium doped magnesium tetraborate have been investigated for the first time. MgB₄O₇:Dy³⁺ was synthesized by ceramic and solution-assisted methods. X-ray diffraction (XRD) patterns corroborate the crystalline phase of MgB₄O₇ obtained. Scanning electron microscopy revealed aggregates and porous regions in the MgB₄O₇ phosphor. Radioluminescence showed an intrinsic emission band at approximately 370 nm and two other narrow bands at 480 nm and 575 nm associated to ⁴F_9/2→⁶H_J transitions of the Dy³⁺ ion, with J = 15/2 and J = 13/2, respectively. The optically stimulated luminescence properties after beta irradiation were analyzed, and the Dy-doped MgB₄O₇ showed a linear dose response over the range studied.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121390"},"PeriodicalIF":3.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548659","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}

{"title":"Mn-Si Co-doping strategy for high-CRI and thermally stable Ce: YLuAG phosphor ceramics for laser-driven white light sources","authors":"Shenghui Lin ,&nbsp;Chang Min ,&nbsp;Zitong Liu ,&nbsp;Peng Wang ,&nbsp;Jian Kang ,&nbsp;Bingheng Sun ,&nbsp;Yang Li ,&nbsp;Enjin Liu ,&nbsp;Tianyuan Zhou ,&nbsp;Yanbin Li ,&nbsp;Wieslaw Strek ,&nbsp;Robert Tomala ,&nbsp;Hao Chen ,&nbsp;Le Zhang","doi":"10.1016/j.jlumin.2025.121386","DOIUrl":"10.1016/j.jlumin.2025.121386","url":null,"abstract":"<div><div>The low color rendering index (CRI) of single-structured Ce: YAG phosphor ceramics (PCs) greatly limits their practical application in white laser-driven (LD) lighting due to the deficient red component. Traditional methods to enhance CRI often come at the expense of thermal stability, posing a challenge for widespread adoption. To address this issue, we proposed a multi-component co-doping strategy by incorporating Lu³⁺ and Mn²⁺/Si⁴⁺ into Ce: YAG PCs. Lu³⁺ incorporation stabilized the crystal lattice, maintained the spatial separation between Ce³⁺ and Mn²⁺, and reduced Ce³⁺-Mn²⁺ energy transfer, thereby suppressing nonradiative transitions and ensuring excellent thermal stability. Additionally, Mn²⁺-Si⁴⁺ co-doping achieved high-concentration incorporation through charge compensation, effectively sustaining strong red emission to enhance the CRI. The optimized Mn10 sample demonstrated exceptional thermal stability, retaining 83.2 % of its emission intensity at 423 K. Moreover, the CRI of Ce,Mn-Si:YLuAG increased from 57.5 to 84.5, a 47 % improvement compared with Ce:YLuAG under high-power LED excitation. These results indicated that Ce, Mn-Si: YLuAG PC, with its excellent CRI and thermal stability, is a highly promising color converter for highpower white LEDs and LDs. <strong>Keywords</strong>: Ce: YAG phosphor ceramic; Ce³⁺-Mn²⁺ codoping; white LDs; color rendering index; crystal-field splitting.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121386"},"PeriodicalIF":3.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548660","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}

{"title":"Red-emitting Eu3+-doped NaInGe2O6 phosphor for WLEDs: Crystal structure, luminescence properties and thermal stability","authors":"Weijie Yuan ,&nbsp;Dongwen Cai ,&nbsp;Shuai Ma ,&nbsp;Huaiyong Li ,&nbsp;Quansheng Wu ,&nbsp;Xufeng Zhou ,&nbsp;Wanying Geng","doi":"10.1016/j.jlumin.2025.121385","DOIUrl":"10.1016/j.jlumin.2025.121385","url":null,"abstract":"<div><div>This article systematically investigates the preparation, structure, and luminescent properties of a novel Eu³⁺-based germanate phosphor: NaInGe₂O₆ (NIGO): Eu³⁺. NIGO: Eu³⁺ exhibits strong absorption in the near ultraviolet (NUV) and blue region, which enables it to be effectively excited by the blue LED chip. Under 465 nm excitation, NIGO: Eu³⁺ exhibits a red emission peak at 610 nm, reaching 82.60 % and 68.6 % of the emission intensity of Y₃Al₅O₁₂ (YAG): Ce³⁺ and K₂TiF₆:Mn⁴⁺. NIGO: Eu³⁺ also has good thermal stability, retaining 76.23 % even at 150 °C. Furthermore, combining NIGO: Eu³⁺ with commercial YAG: Ce³⁺ phosphors significantly enhances the luminescent performance of blue-chip-excited white light-emitting diodes (WLEDs), including improvements in color rendering index (CRI) and correlated color temperature (CCT). This work indicates that NIGO: Eu³⁺ phosphors possess promising potential for WLED applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121385"},"PeriodicalIF":3.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572473","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}