Optical Materials最新文献

{"title":"Lanthanide-dependent clustering in Yb3+/Ln3+ co-doped CaF2 nanocrystals: Correlating spectroscopic signatures with DFT insights","authors":"Sangeetha Balabhadra ,&nbsp;Haoming Xu ,&nbsp;Jiajia Cai ,&nbsp;Chang-Kui Duan ,&nbsp;Michael F. Reid ,&nbsp;Jon-Paul R. Wells","doi":"10.1016/j.optmat.2026.117920","DOIUrl":"10.1016/j.optmat.2026.117920","url":null,"abstract":"<div><div>The formation of heterogeneous lanthanide-ion clusters in CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> was investigated experimentally and computationally. CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> nanoparticles co-doped with 20 mol% Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and 2 mol% Ln<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> (Ln<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> = Ce<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Pr<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Nd<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Sm<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Eu<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Gd<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Ho<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, Er<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, and Tm<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>) were synthesized via a hydrothermal method. The structural and morphological properties were characterized using powder X-ray diffraction, dynamic light scattering, and transmission electron microscopy techniques. High-resolution Fourier transform infra-red spectroscopy revealed the presence of Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> isolated cubic centers and various cluster sites. The relative concentration of the clusters varied with the choice of the co-doping ion. Calculations based on density functional theory were used to estimate the formation energies and local coordination structures of different clusters. The calculations indicate that the neutral <span><math><msub><mrow><mi>C</mi></mrow><mrow><mn>4</mn><mi>v</mi></mrow></msub></math></span> aggregations containing Ln<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> tend to decrease across the lanthanide series, while the negatively charged derivatives of hexameric clusters are relatively constant. This variation matches the experimental results. This study advances understanding of the clustering mechanisms in lanthanide-doped CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> nanoparticles and has implications for luminescence optimization in advanced nanomaterials.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117920"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrahigh quantum yield in organic-inorganic hybrid metal halide perovskites: LED and X-ray imaging applications","authors":"Junheng Yuan,&nbsp;Dedan Mu,&nbsp;Ziyi Zhang,&nbsp;Hao Song,&nbsp;Linglu Kuang,&nbsp;Bin Meng,&nbsp;Xu Tian,&nbsp;Jie Yu","doi":"10.1016/j.optmat.2026.117896","DOIUrl":"10.1016/j.optmat.2026.117896","url":null,"abstract":"<div><div>Organic-inorganic hybrid metal halide perovskites (OIMHPs) are emerging as next-generation optoelectronic materials, exhibiting superior luminescence and scintillation properties that make them highly suitable for light-emitting diodes (LEDs) and X-ray detection. To fully realize their potential, the development of OIMHPs with superior quantum efficiency and enhanced optical performance remains a significant obstacle. Herein, we report the successful synthesis of a (C₂₅H₂₂P)₂MnBr₄ perovskite by employing benzyl triphenyl phosphorus bromide ([C₂₅H₂₂P]⁺) as the organic A-site cation. The synthesized material demonstrates an exceptional near-unity photoluminescence quantum yield (PLQY) of 92 % under 465 nm excitation, which is attributed to the strategic isolation of [MnBr₄]^2- units through the incorporation of sterically demanding organic groups at the A-site. This structural engineering strategy effectively reduces non-radiative transitions between Mn²⁺ ions, thereby substantially improving luminous efficiency. The resulting perovskite exhibits remarkable thermal stability, superior photoluminescence characteristics, and excellent scintillation performance, making it an ideal candidate for fabricating high-color-purity LEDs and high-efficiency scintillation screens. Furthermore, the material's low toxicity, cost-effective synthesis route, and straightforward preparation process position it as a highly promising candidate for a wide range of advanced optical applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117896"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing new perovskite-based scintillator employing an overlooked luminescence phenomenon","authors":"Jan Pejchal ,&nbsp;Petr Průša ,&nbsp;Valentin V. Laguta ,&nbsp;Vladimir Babin ,&nbsp;Lenka Prouzová-Procházková ,&nbsp;Alena Beitlerová ,&nbsp;Romana Kučerková","doi":"10.1016/j.optmat.2026.117964","DOIUrl":"10.1016/j.optmat.2026.117964","url":null,"abstract":"<div><div>We have studied luminescence and scintillation properties of LaAlO₃ crystal triply codoped with 0.1%Ce, 0.1%Cr and 0.1% Mg. Such a doping invoked Ce-terminated Cr emission, a phenomenon observed earlier in other materials, but long time overlooked. The emission appeared at 418 nm under excitation into Ce³⁺ 4f-5d absorption bands. It is worth mentioning that such an observation was made for material where no Ce-related luminescence can be observed at all. The possible luminescence mechanism is discussed together with promising characteristics such as photoluminescence decay time around 45 ns and an overall scintillation efficiency just slightly inferior to that of BGO. However, the significant afterglow deteriorates the practical scintillation parameters. Despite that, we do believe that the described codoping strategy and deeper understanding of the luminescence and afterglow mechanisms can lead to development of new luminescence and scintillation materials where Ce³⁺ 5d-4f luminescence cannot usually take place, but the Ce-terminated Cr-emission can be exploited. There is also considerable room for further material optimization by the dopant concentration tuning.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117964"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and optical properties of mixed phase WO3 – ZnWO4 films synthesized from thermally oxidized metallic Zn–W films","authors":"Stefan Jovanovski ,&nbsp;Maja Popović ,&nbsp;Mirjana Novaković ,&nbsp;Mimoza Ristova","doi":"10.1016/j.optmat.2026.117950","DOIUrl":"10.1016/j.optmat.2026.117950","url":null,"abstract":"<div><div>Tungsten-bearing compounds have attracted significant interest in recent years, especially in thin films or nano powder form, due to their photocatalytic activity stemming from their wide band gap semiconductor properties. This study presents the synthesis of mixed phase WO₃–ZnWO₄ films synthesized by thermal oxidation of co-sputtered metallic Zn–W films. From XRD analysis it appeared that annealing at 600 °C leads to the formation of the monoclinic Zn-tungstate phase within the WO₃ matrix with crystallite size about 50 nm for both phases. The XPS analysis of the O1s peak showed mixed phase compound of WO₃ matrix with about 13 at.% of ZnWO₄. Raman and infrared spectroscopy further characterize the structural features, revealing the WO₆ octahedral unit as main building block in the structure. The optical band gap of the annealed film was found to be 3.34 eV, indicating a wide gap semiconductor. The films displayed a UV induced Photoluminescence with broad PL spectra with emission maximum at about 2.48 eV. The study demonstrates that co-sputtering and annealing at 600 °C approach is effective for synthesizing of tungstate phase ZnWO₄ within WO₃ matrix.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117950"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoluminescence and scintillation properties of Si3N4-reduced Cu ions-doped gadolinium borosilicate glasses","authors":"Yanhui Song ,&nbsp;Gao Tang ,&nbsp;Laishun Qin ,&nbsp;Hang Yin ,&nbsp;Qinhua Wei ,&nbsp;Sen Qian ,&nbsp;Yinsheng Xu ,&nbsp;Xiaoqing Liu ,&nbsp;Qianli Li ,&nbsp;He Feng ,&nbsp;Yihong Qi ,&nbsp;Jiawei Sheng ,&nbsp;Peiqing Cai","doi":"10.1016/j.optmat.2026.117948","DOIUrl":"10.1016/j.optmat.2026.117948","url":null,"abstract":"<div><div>A series of Cu⁺ -doped 20Gd₂O₃–20B₂O₃–50SiO₂–10MgO glasses were successfully prepared using the melt-quenching method under an air atmosphere. By introducing the solid-state reducing agent Si₃N₄, the valence state of Cu ions (Cu²⁺ → Cu⁺ → Cu⁰) was effectively and controllably adjusted. Under UV or X-ray excitation, all samples exhibited broadband emission in the visible region. The sample with the most effective Si₃N₄ reduction showed the best overall performance, characterized by a photoluminescence quantum yield (PLQY) of 52.12%, a visible light transmittance of 80%, a decay time in the microsecond range, an X-ray excited luminescence (XEL) integrated intensity reaching 86.6% of Bi₄Ge₃O₁₂ (BGO), and high spatial resolution (22.0 lp/mm). These results demonstrate that using Si₃N₄ as a low-cost, safe reducing agent can effectively stabilize the Cu⁺ luminescence center, significantly enhancing the luminescence and scintillation properties of Cu⁺ -doped glasses. These results provide a new approach for developing high-performance non-rare-earth glass scintillators for X-ray imaging.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117948"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"All-liquid laser-assisted fabrication of 3D-textured hybrid metal–semiconductor SERS platforms","authors":"A. Zakharov ,&nbsp;A. Vavilov ,&nbsp;A. Levshakova ,&nbsp;A. Pilnik ,&nbsp;E. Mitsai ,&nbsp;A. Shevlyagin ,&nbsp;E. Khairullina ,&nbsp;A. Kuchmizhak ,&nbsp;A. Manshina","doi":"10.1016/j.optmat.2026.117955","DOIUrl":"10.1016/j.optmat.2026.117955","url":null,"abstract":"<div><div>We report an all-liquid, vacuum-free approach for fabricating hybrid metal–semiconductor platforms for surface-enhanced Raman scattering (SERS). Silicon wafers were textured into upright (Pyr-Si) and inverted pyramids (IPyr-Si) by anisotropic alkaline etching and Cu-assisted chemical etching, respectively, both yielding broadband antireflective morphologies. Subsequent laser-induced deposition (LID) enabled surfactant-free decoration of these 3D morphologies with Au, Ag, and bimetallic AuAg nanoparticles directly in solution. Scanning electron microscopy (SEM) images and energy dispersive X-ray spectroscopy (EDX) mapping versus exposure time reveal distinct Ag/Au growth modes consistent with plasmon-assisted and substrate-assisted pathways. SERS performance was benchmarked with rhodamine 6G (R6G) down to 10⁻¹² M, delivering an enhancement factor of ∼2.9 × 10⁹ for Ag/IPyr-Si. Practical sensing of ketoprofen and plasmon-driven catalytic dimerization of p-aminothiophenol (PATP) were also demonstrated. Compared with conventional vacuum-based techniques, this approach minimizes air exposure, lowers costs, and delivers conformal nanoparticle coverage on complex silicon morphologies, providing a scalable route to reproducible, high-performance SERS sensors and related optoelectronic interfaces.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117955"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Mn2+/Tm3+ co-doping on the thermal stability, optical properties and photovoltaic performance of fluoride glasses","authors":"Olfa Maalej ,&nbsp;Bich Diep Tran ,&nbsp;Mihaela Girtan ,&nbsp;Brigitte Boulard","doi":"10.1016/j.optmat.2026.117949","DOIUrl":"10.1016/j.optmat.2026.117949","url":null,"abstract":"<div><div>The current study explores the thermal stability, optical properties and spectral down-conversion performance of Mn²⁺/Tm³⁺ co-doped fluoride glasses. Differential thermal analysis revealed that Mn²⁺ concentration significantly influences glass stability, with an optimal stabilization observed at lower Mn²⁺ content. The decrease in the optical band gap from 5.8 to 5.2 eV with increasing Mn²⁺ concentration (from 0 to 30 %) in the presence of Tm³⁺ co-doping (0.75 %), indicates the formation of new energy states introduced by Mn²⁺ ions within the glass matrix. Photoluminescence measurements demonstrated an effective energy transfer from Mn²⁺ to Tm³⁺ ions, resulting in a strong emission at 800 nm corresponding to Tm³⁺. This emission reaches its maximum at 25 % Mn²⁺, with a fixed Tm³⁺ concentration of 0.75 %. The co-doped glasses have been tested as encapsulation materials for solar cells. Despite the good energy conversion from blue to near-infrared region, no increase in cell efficiency was detected.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117949"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Al3+ optimization effect on the TiO2 compact layer in CdS quantum dot-sensitized solar cell photoelectrodes","authors":"Osvaldo Morales ,&nbsp;R.A. Rodríguez-Rojas ,&nbsp;Jesus Castañeda-Contreras ,&nbsp;Diego Esparza ,&nbsp;Isaac Zarazua","doi":"10.1016/j.optmat.2026.118003","DOIUrl":"10.1016/j.optmat.2026.118003","url":null,"abstract":"<div><div>The effect of Al³⁺-doped TiO₂ compact layers on the performance of CdS quantum dot–sensitized solar cells (QDSSCs) was investigated. QDSSCs with an FTO/TiO₂ (compact, transparent, and opaque)/TiO₂/CdS/ZnS/electrolyte/Cu₂S architecture were fabricated. TiO₂ compact layers doped with Al³⁺ at concentrations of 0, 5, 10, and 20 mM were prepared. The absorbance spectra exhibited a slight shift with increasing Al³⁺ doping, which is attributed to distortion of the TiO₂ lattice. J–V measurements revealed an increase in power conversion efficiency from 1.31% to 1.55%, corresponding to an enhancement of approximately 18%. The light-harvesting efficiency (η_LHE), associated with the external quantum efficiency (EQE), showed improved absorption in the visible and near-infrared regions upon Al³⁺ incorporation. Electrochemical impedance spectroscopy indicated that Al³⁺ introduces defect states acting as new energy levels. These states influence recombination losses through variations in the recombination resistance (R_rec) and chemical capacitance (C_μ), suggesting a shift in the energy bands consistent with n-type doping of the compact layer. Moreover, the transport resistance (R_t) decreased with Al³⁺ doping, promoting enhanced charge transport and collection in both the compact and mesoporous layers. Consequently, the devices exhibited an increase in current density without a significant loss in open-circuit voltage.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 118003"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bacterial cellulose–supported Bi-MOF Z-scheme heterojunctions with enhanced optical and photocatalytic performance for tetracycline degradation","authors":"Muhammad Ilyas Jahangir ,&nbsp;Yue Shen ,&nbsp;Haoyang Xu ,&nbsp;Chaoqun Mu ,&nbsp;Zhiqiang Zhang ,&nbsp;Yao Wang ,&nbsp;Zhixian He ,&nbsp;Zhang Liang","doi":"10.1016/j.optmat.2026.117866","DOIUrl":"10.1016/j.optmat.2026.117866","url":null,"abstract":"<div><div>The persistent release of antibiotics such as tetracycline (TC) into aquatic environments poses serious ecological and health concerns. Developing efficient, stable, and recyclable photocatalysts for antibiotic removal is therefore crucial. In this work, a bacterial cellulose-supported Bi-MOF heterojunction (Bi-BDC/BiOIO₃/BC) was constructed via an in-situ self-assembly process to achieve synergistic adsorption–photocatalytic degradation of TC under visible-light irradiation. The three-dimensional bacterial cellulose (BC) framework facilitated the uniform distribution of Bi-MOF nanostructures, providing a large surface area, superior light-harvesting ability, and enhanced charge carrier separation. The optimized Bi-BDC/BiOIO₃/BC composite achieved 90 % TC removal within 60 min, which was 2.7 and 3.8 times higher than that of pure BiOIO₃ and Bi-BDC, respectively. Electron spin resonance (ESR) and radical trapping experiments identified ·O₂⁻ and h⁺ as dominant reactive species, confirming a Z-scheme charge transfer mechanism. Density functional theory (DFT) calculations further verified the narrowed bandgap and improved visible-light response resulting from heterojunction formation. The composite exhibited excellent stability, retaining over 80 % of its photocatalytic efficiency after four cycles. The integration of bacterial cellulose enhanced both adsorption and recovery properties, enabling a sustainable, recyclable photocatalyst for antibiotic wastewater treatment. This study provides a green and practical strategy for designing biomass-supported photocatalysts that couple optical efficiency with environmental remediation potential.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117866"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tuning structure and red emission in MgGa2O4: The role of Yb3+/Eu3+ co-doping via homogeneous precipitation","authors":"Fenfen Jiang ,&nbsp;Hui Chang ,&nbsp;Xingtao Chen","doi":"10.1016/j.optmat.2026.117989","DOIUrl":"10.1016/j.optmat.2026.117989","url":null,"abstract":"<div><div>This study presents a comparative investigation into the individual and synergistic effects of Yb³⁺ and Eu³⁺ doping on the structural and photoluminescent properties of MgGa₂O₄ phosphors. This work demonstrates a strategy for engineering efficient red-emitting phosphors through synergistic Yb³⁺/Eu³⁺ co-doping in a defect-rich MgGa₂O₄ spinel host, synthesized via an ammonium sulfate-assisted homogeneous precipitation route. Rietveld refinement of XRD data reveals that the trivalent dopants preferentially occupy octahedral Ga³⁺ sites, inducing a controlled lattice expansion. Under ultraviolet excitation, the 1 at.% Eu³⁺/0.1 at.% Yb³⁺ co-doped sample showed the strongest characteristic red emissions. Furthermore, the intrinsic defect structure of the inverse spinel host is shown to be beneficial, as it provides the low-symmetry crystal fields necessary for activating the dominant electric dipole transition of Eu³⁺. Notably, the introduction of Yb³⁺ does not introduce strong emission centers in the red spectral region, but can effectively suppresses the host-related emission at 705 nm. This work elucidates the distinct roles of Yb³⁺ as a structural modifier and Eu³⁺ as an activator, providing insights into the design of red-emitting phosphors with tunable optical properties through selective rare-earth co-doping.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117989"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}