Optical Materials最新文献

{"title":"Plasmonic Ag nanocomposite phosphate glasses produced via γ-ray irradiation as reduction route","authors":"José A. Jiménez ,&nbsp;Jared S. Kinyon ,&nbsp;Charles L. Crawford","doi":"10.1016/j.optmat.2025.116928","DOIUrl":"10.1016/j.optmat.2025.116928","url":null,"abstract":"<div><div>This paper reports on the impact of γ-ray irradiation (10, 100 kGy) on melt-quenched Ag⁺-doped phosphate glass and the effects of subsequent thermal processing leading to the production of plasmonic Ag nanocomposites. The γ-irradiated glasses were characterized alongside the pristine by differential scanning calorimetry (DSC), Raman spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, optical absorption, and photoluminescence (PL) spectroscopy. DSC characterization showed consistent glass transition temperatures (<em>T</em>_<em>g</em>) before and after γ-irradiation whereas the crystallization temperatures tended to decrease with increasing γ-ray dose. However, a lack of alteration of the glass network structure was supported by Raman spectroscopy. Room temperature EPR spectra clearly showed the formation of phosphorus oxygen hole center (POHC) defects in the undoped host, in addition to another doublet likely associated with a <em>P</em>₃ defect. The presence of paramagnetic silver species encompassing Ag²⁺ and ^107/109Ag⁰ atoms was also indicated in the silver-activated glass together with POHC defects. Optical absorption spectra were also consistent with the presence of various radiation-induced centers. Further analyzing the glass absorption edge <em>via</em> Tauc plots suggested the formation of electron center (EC) defects in γ-irradiated samples wherein the silver-doped glass exhibited decreasing band gap energies with increasing γ-ray dose. The PL characterization showed the silver-related radio-PL effect was induced exhibiting broad band emission with two maxima around 500 and 625 nm stemming from various molecular <span><math><mrow><msubsup><mtext>Ag</mtext><mi>n</mi><mrow><mi>x</mi><mo>+</mo></mrow></msubsup></mrow></math></span> clusters. Emission decay analyses revealed that the longer wavelength emission exhibited slower decay. The highest radiation dose of 100 kGy however resulted in weaker emission and faster decay kinetics attributed to energy transfer between the luminescent silver species and POHC defects. Finally subjecting the γ-irradiated Ag-doped glasses to heat treatment near the <em>T</em>_<em>g</em> at 490 °C led to the development of the surface plasmon resonance of Ag nanoparticles (NPs) and the vanishing of the <span><math><mrow><msubsup><mtext>Ag</mtext><mi>n</mi><mrow><mi>x</mi><mo>+</mo></mrow></msubsup></mrow></math></span> clusters luminescence. The presence of the matrix-related EC defects was deemed accountable for the thermally induced reduction and consequent precipitation of Ag NPs making the plasmonic glasses attractive for photonic applications such as nonlinear optics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116928"},"PeriodicalIF":3.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621253","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":"A new family of Pt(II) isocyanide complexes with NNC-type pincer ligands: Correlation between structural features and aggregation-induced emission","authors":"Elizaveta V. Durova,&nbsp;Ekaterina E. Galenko,&nbsp;Andrey A. Shtyrov,&nbsp;Mikhail N. Ryazantsev,&nbsp;Kristina S. Kisel,&nbsp;Julia R. Shakirova,&nbsp;Sergey P. Tunik","doi":"10.1016/j.optmat.2025.116926","DOIUrl":"10.1016/j.optmat.2025.116926","url":null,"abstract":"<div><div>Four square-planar [(NNC)Pt(CN-Xyl)]OTf complexes bearing a novel tridentate ligands (NNC-1/4) were synthesized and fully characterized. Photophysical properties of the obtained compounds were investigated in acetonitrile solution, solid state and aqueous dispersion. It was shown that the complexes in their monomeric form exhibit moderate phosphorescence in the visible and NIR regions with a clear correlation of emission maxima with the nature of the cyclometalated fragment in the pincer ligand. Complexes with substituted phenyl ring as the C-coordinated fragment <strong>(NNC-1/3)Pt(CN-Xyl)</strong> demonstrate aggregation induced emission (AIE) with a strong red shift of emission bands in the solid state and water dispersions, the magnitude of which correlates with the packing mode of the molecules, i.e., with the number of platinum metal centers taking part in formation of aggregates. The complex containing benzothienyl C-coordinated moiety (<strong>NNC-4)Pt(CN-Xyl</strong>) shows no AIE effects that is in agreement with its structural features, which do not allow formation of the aggregates with short Pt–Pt contacts. All correlations between the photophysical behavior of the complexes, their composition and structural parameters were also confirmed by quantum-chemical calculations based on the analysis of the model systems containing monomers, dimers and trimers of the starting complexes.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116926"},"PeriodicalIF":3.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642840","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":"Plasmon-enhanced absorption in dielectric layer coated III-V nanowire array decorated with nanoparticles","authors":"Hanchen Zhu ,&nbsp;Yanmeng Chu ,&nbsp;Fuxiang Shang ,&nbsp;Linjun Zhang ,&nbsp;Yunqi Chen ,&nbsp;Haodong Wang ,&nbsp;ZhouXiang Chen ,&nbsp;Qichao Hou ,&nbsp;Lulu Chen ,&nbsp;Weiou Qin ,&nbsp;Zhiyuan Cheng ,&nbsp;Yunyan Zhang","doi":"10.1016/j.optmat.2025.116922","DOIUrl":"10.1016/j.optmat.2025.116922","url":null,"abstract":"<div><div>The group III-V nanowires (NWs) have broad prospects in the field of photoelectric detection, among which GaN and InN NWs are promising candidates for ultraviolet (UV) and short-wave infrared (SWIR) photodetectors but have rarely been studied in depth. Furthermore, there is a lack of research on the further improvement of their photoelectric performance. In this research, we introduce a thin dielectric layer in the structure of nanowire array decorated with metal nanoparticles (NPs) for the first time, demonstrating how dielectric layer between NWs and NPs further improve light absorption efficiency. Surface plasmons (SPs) excited by NPs, along with the dielectric layer which can concentrate the incident light, result in obvious enhancement of the absorption rate, the rationality of this design is supported by the calculation results in both ultraviolet UV and SWIR range. For GaN NWs, light absorption rate can be increased from 76 % to 96 % near 335 nm and for InN NWs the peak of absorption curve rises from 49 % to 97 % near 1550 nm. The simulation results will provide a reference for improving the performance of photodetectors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116922"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628904","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":"Cr3+-doped double-perovskite Sr2(Sc/In)NbO6 phosphors with broadband near-infrared emission","authors":"Lifang Yuan,&nbsp;Junzhong Wang,&nbsp;Zhijin Huang,&nbsp;Kaixiang Shen","doi":"10.1016/j.optmat.2025.116918","DOIUrl":"10.1016/j.optmat.2025.116918","url":null,"abstract":"<div><div>Cr³⁺-activated broadband near-infrared (NIR) phosphors have attracted considerable interest due to their potential for next-generation intelligent NIR light sources. In this work, novel broadband near-infrared (NIR) phosphors of Cr³⁺-doped Sr₂(Sc/In)NbO₆ were successfully prepared by a solid-state reaction method. Cr³⁺-doped Sr₂ScNbO₆ and Sr₂InNbO₆ exhibit broadband emissions ranging from 700 to 1200 nm centered at 830 nm and 850 nm, respectively, due to the ⁴T₂–⁴A₂ transitions. The optimal doping concentrations of Cr³⁺ in the Sr₂ScNbO₆ and Sr₂InNbO₆ were experimentally determined to be 0.3 % and 0.5 % with PLQY of 40.1 % and 35.2 %, respectively. The activation energy, a measure of thermal quenching performance, for Sr₂ScNbO₆:Cr³⁺ and Sr₂InNbO₆:Cr³⁺ were calculated to be 0.131 and 0.110 eV, respectively. The mechanisms behind the NIR luminescence and thermal quenching were illustrated in detail. Encapsulating prototype broadband NIR phosphor-converted light-emitting diode (pc-LED) devices by combining the as-obtained phosphors with blue LED chips yields the highest NIR output power of 13 mW at 300 mA and a photoconversion efficiency (PCE) of 10 % at 30 mA, enabling bio-imaging applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116918"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610686","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":"Halogen atoms doped FeOCl promoting Fe (II)/Fe (III) cycles to accelerate the photo-Fenton-like progress","authors":"Lianqing Yu ,&nbsp;Xin Li ,&nbsp;Yanxing Liu ,&nbsp;Yaping Zhang ,&nbsp;Haifeng Zhu ,&nbsp;Liana Alvares Rodrigues ,&nbsp;D. Amaranatha Reddy","doi":"10.1016/j.optmat.2025.116923","DOIUrl":"10.1016/j.optmat.2025.116923","url":null,"abstract":"<div><div>FeOCl possesses a layered structure that not only effectively catalyzes the degradation of organic pollutants under visible light but has also garnered significant attention for its Fenton-like reaction properties in pollutant degradation. In this study, pure FeOCl and halogen-doped X–FeOCl (X = Br, F, I) were synthesized, exhibiting bandgap widths of 1.77 eV for pure FeOCl and 1.67, 1.69, 1.72 eV for the doped versions, respectively. The X–FeOCl catalysts demonstrated superior photocatalytic activity and Fenton-like properties in the degradation of methylene blue across various pH conditions under simulated visible light exposure. Notably, under neutral conditions, F–FeOCl showed a degradation constant (k) that was 14.56 times higher than that of pure FeOCl during the photo-Fenton-like catalytic process within 30 min. Furthermore, Density Functional Theory (DFT) calculations revealed that structural distortion and reduced symmetry in X–FeOCl play critical roles in boosting electronic interactions at the doped sites, thereby facilitating the photo-Fenton-like reaction. This task enhances the understanding of FeOCl-based materials as photo-Fenton-like catalysts and offers insights into their applications in water purification and broader environmental remediation based on the degradation of MB dye.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116923"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601119","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":"A warm - orange light emitting eulytite type NaCaBi2-x(PO4)3: xSm3+ phosphor for white light emitting diodes (W-LEDs) application","authors":"Chitrkant Belodhiya ,&nbsp;D.P. Bisen ,&nbsp;Nameeta Brahme ,&nbsp;Ganesh Ram Banjare ,&nbsp;Sanjay Baghel ,&nbsp;Dipti Sahu ,&nbsp;Yugbodh Patle ,&nbsp;Pradeep Dewagan ,&nbsp;A.S. Sai Prasad","doi":"10.1016/j.optmat.2025.116919","DOIUrl":"10.1016/j.optmat.2025.116919","url":null,"abstract":"<div><div>In this study, a series of samarium (Sm³⁺) activated eulytite type orthophosphate NaCaBi_2-<em>x</em>(PO₄)₃ i.e. (NCBP: <em>x</em>Sm³⁺) phosphors with varying concentrations (<em>x</em> = 1–7mol%) of Sm³⁺ ions were successfully synthesized using high-temperature solid phase reaction routes. The crystal structure, surface morphology, elemental composition, band gap, thermal stability and optical properties of NCBP: <em>x</em>Sm³⁺ were systematically investigated. The X-ray diffraction (XRD) pattern of host and Sm³⁺ doped NCBP exhibited a strong correlation with standard reference data (PDF 47–0836), confirming the successful synthesis of the samples. The band gaps of the host material and NCBP: 0.03Sm³⁺ were determined using diffuse reflectance spectroscopy, measuring 4.364 and 4.327 eV, respectively. The (Thermogravimetry analysis) TGA analysis indicates that the TGA curve stabilizes upon reaching 500 °C, confirming that the optimized phosphor maintains high thermal stability, even at elevated temperatures. In the NCBP: <em>x</em>Sm³⁺ phosphor, under the excitation of at 405 nm, phosphors showed three significant emission peaks at 564 nm (green region), 600 nm (orange region) and 645 nm (red region) corresponding to the ⁴G_5/2 → ⁶H_5/2, ⁴G_5/2 → ⁶H_7/2, and ⁴G_5/2 → ⁶H_9/2 spectroscopic transition, respectively. The critical distance was calculated to be 20.33 Å and the energy transfer occurred due to multipolar interaction between activator ions. The Commission Internationale de l’Éclairage (CIE) chromaticity coordinates were found to lie in the deep orange-red region of the CIE diagram. These studies indicate that the NCBP: <em>x</em>Sm³⁺ phosphor have well application prospects as a single component warm solid state lighting device, especially white-light emitting diodes (W-LEDs).</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116919"},"PeriodicalIF":3.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610685","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":"High-performance TiO2 UV photodetectors with improved response time achieved through sol-gel synthesis and PDMS surface passivation","authors":"Zhifan Qiu ,&nbsp;Zhengyu Xu ,&nbsp;Wei Chen ,&nbsp;Xiaofei Ma ,&nbsp;Qinggang Qin ,&nbsp;Lin Wu ,&nbsp;Siliang Wang ,&nbsp;Qi Hong ,&nbsp;Liang Li","doi":"10.1016/j.optmat.2025.116905","DOIUrl":"10.1016/j.optmat.2025.116905","url":null,"abstract":"<div><div>In the pursuit of enhancing ultraviolet (UV) photodetector performance, we present an advanced optimization technique that utilizes polydimethylsiloxane (PDMS) coating on titanium dioxide (TiO₂) thin films. The native surface of titanium dioxide thin films is rich in oxygen vacancies, and these defects usually lead to carrier trapping resulting in prolonged retention time, which in turn affects the performance of the prepared detectors and makes them underperform. Our improvement effectively mitigates the atypical carrier recombination associated with surface defects by reducing them. Consequently, we have achieved a substantial boost in the performance metrics of our TiO₂ UV photodetector through the implementation of cutting-edge surface modification methods. This refinement has led to a striking reduction in the detector's rise time, plummeting from 17.10 s to a mere 1.80 s, and an equally impressive decrease in the fall time, shrinking from 10.56 s to just 1.58 s. Moreover, the responsiveness and detection rate have seen a remarkable increase, jumping from 790.78 A/W and 5.91 × 10¹³ Jones to an impressive 4.04 × 10³ A/W and 1.48 × 10¹⁵ Jones, respectively.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116905"},"PeriodicalIF":3.8,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601121","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":"Study on the performance and mechanism of photocatalytic reduction of Cr(VI) through boron-doped g-C3N4 under visible light","authors":"Yuhang Gao,&nbsp;Lijun Nie,&nbsp;Na Zheng,&nbsp;Kunkun Xue,&nbsp;Wangchao Su,&nbsp;Yueyu Ma,&nbsp;Xiaobei Han,&nbsp;Lirong Ren,&nbsp;Jianhui Shi","doi":"10.1016/j.optmat.2025.116889","DOIUrl":"10.1016/j.optmat.2025.116889","url":null,"abstract":"<div><div>Hexavalent chromium (Cr(VI)) is an extremely toxic and soluble substance that poses a significant threat to human and environmental health. Photocatalysis is an efficient and environmentally friendly technique of reducing Cr(VI) in water. In this study, B-doped g-C₃N₄ (BCN) materials were synthesized by one-pot thermal polycondensation method. The experimental results indicated that under the visible light irradiation of citric acid solution, the photoreduction rate constant of BCN 1:0.15 for Cr(VI) reached 4.1421 h⁻¹, which was 7.15 times higher than that of g-C₃N₄, and 98.8 % of Cr(VI) could be degraded within 30 min. The electronic energy band structure and photocatalytic properties of BCN can be effectively tuned by adjusting the doping amount of boric acid. The B atoms were doped into the g-C₃N₄ lattice, replacing carbon atoms, while the BCN maintained the essential structure of g-C₃N₄. Compared with g-C₃N₄, the modified BCN exhibited a broader visible light response range and enhanced electron-hole separation capability. The stability and recyclability of the BCN photocatalysts were also evaluated. The results indicate BCN 1:0.15 maintained a high activity after five cycling experiments. In addition, a possible photocatalytic reduction mechanism was proposed based on free radical trapping experiments. This study provides insights and considerations for efficient photocatalytic reduction of Cr(VI) in wastewater.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116889"},"PeriodicalIF":3.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601120","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":"An efficient SERS substrate for target molecule aggregation and localization Analysis: WS2 nanoparticles in pitted a-plane GaN","authors":"Tsung-Shine Ko ,&nbsp;Hsiang-Yu Hsieh ,&nbsp;Sean Wu ,&nbsp;Jiann Shieh ,&nbsp;Wei-Chun Chen ,&nbsp;Wei-Lin Wang ,&nbsp;Yang-Wei Lin","doi":"10.1016/j.optmat.2025.116890","DOIUrl":"10.1016/j.optmat.2025.116890","url":null,"abstract":"<div><div>In this study, we employed metal–organic chemical vapor deposition (MOCVD) to grow pitted a-plane GaN with triangular pits of approximately several micrometers in size on r–plane sapphire substrates. Subsequently, WO₃ nanoparticles were sulfurized in a furnace, undergoing high–temperature deoxygenation and sulfur bonding to form irregularly shaped WS₂ nanoparticles. These WS₂ nanoparticles were then titrated onto the GaN substrate. Due to the polar nature of the atomic lattice arrangement of GaN along the c-axis, scanning electron microscopy revealed that WS₂ particles were attracted to the pits by the polar electric field caused by the Ga and N faces of the GaN, forming a WS₂/a-plane GaN heterostructure. Using Rhodamine 6G (R6G), a polar biological dye, as the target molecule, Raman spectroscopy results indicated that R6G primarily accumulated in the pits. Further surface–enhanced Raman scattering (SERS) analysis demonstrated that this heterostructure effectively increased carrier transition paths and enhanced charge transfer opportunities when detecting R6G. The enhancement factor in the pits reached up to approximately 10⁷, with an outstanding limit of detection of 10⁻¹⁰ M. This study confirms that the WS₂/pitted a-plane GaN heterostructure, with its micron-sized triangular pits advantageous for locating analytes, holds significant potential for aggregating polar molecules and serving as a SERS substrate. This makes it a promising candidate for high-efficiency biomedical detection technologies, thereby enhancing detection efficiency.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116890"},"PeriodicalIF":3.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628905","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":"Luminescence properties of GAGG: 0.06Ce3+, xMn2+, xSi4+ phosphors and their application in white LEDs","authors":"Yu Shen,&nbsp;Jun Qiao,&nbsp;Shuai He,&nbsp;Xiaobo Yu,&nbsp;Shuang Zheng,&nbsp;Luomeng Chao,&nbsp;Yonghong Ma","doi":"10.1016/j.optmat.2025.116914","DOIUrl":"10.1016/j.optmat.2025.116914","url":null,"abstract":"<div><div>We synthesized a series of Ce³⁺ and Mn²⁺ co-doped Gd₃Al₄GaO₁₂(GAGG): 0.06Ce³⁺, xMn²⁺, xSi⁴⁺ (x = 0, 0.05, 0.1, 0.15, 0.2, 0.3) garnet phosphor samples using a high-temperature solid-state reaction method, where Si⁴⁺ ions were co-doped to serve as charge compensators. The emission spectrum of Mn²⁺ in these phosphors exhibits two bands around 595 nm and 702 nm, likely due to Mn²⁺ ions occupying the dodecahedral and octahedral coordination sites within the GAGG matrix. Increasing the concentration (x) of Mn²⁺ in the GAGG: 0.06Ce³⁺, xMn²⁺, xSi⁴⁺ phosphors effectively enhances the Ce³⁺ → Mn²⁺ energy transfer efficiency, intensifies the orange and red emissions of Mn²⁺, and tunes the emission spectra of the phosphors. The GAGG: 0.06Ce³⁺, xMn²⁺, xSi⁴⁺ (x = 0, 0.2, 0.3) phosphor samples were encapsulated with blue LED chips (λ = 450 nm) to fabricate white LEDs. As x increases from 0 to 0.3, the correlated color temperature (CCT) of the white LEDs decreases from 4014 K to 3447 K, while the color rendering index (CRI) increases from 74.8 to 84.5. These results demonstrate that the introduction of Mn²⁺ into GAGG: 0.06Ce³⁺ phosphor can effectively enhance its orange and red emission components through Ce³⁺ → Mn²⁺ energy transfer, thereby improving the chromaticity performance of white LEDs.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"162 ","pages":"Article 116914"},"PeriodicalIF":3.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610689","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}