JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Falin Zhang,Xiaoying Liang,Rongfei Wei,Hai Guo,Fangfang Hu
In this work, a group of Bi 3+ /Eu 3+ -doped SiO 2 –Al 2 O 3 -MCO 3 (M = Ca, Sr, Ba) glasses were fabricated through melt-quenching method. Their structure and photoluminescence characters were studied via X-ray diffraction (XRD), UV–Vis transmission spectra (TRS), excitation spectra, emission spectra and decay lifetimes. The XRD results show that no nano-crystal phase forms in glass matrix with different doping concentrations of Bi 3+ and Eu 3+ ions. Through regulating optical alkalinity value, the intensity of Bi 3+ ions increases and the peak position shifts to red wavelength. The Bi 3+ /Eu 3+ co-doped glasses show a blue-white-yellow-red luminescence by changing concentration of Eu 3+ ions. Energy transfer efficiency from Bi 3+ to Eu 3+ can reach as high as 10.54%. At 423 K, the emission intensity of 55SiO 2 –10Al 2 O 3 –35BaO-0.25Bi 2 O 3 (GBE0.5) is 31.1% of that at 308 K. Meanwhile, the activation energy of the glass matrix is 0.251 eV. All results suggest that these Bi 3+ /Eu 3+ co-doped glass samples possess potential application in LED field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yutong Sun,Qun Zeng,Yanghong Cheng,Zezhong Li
A series of Tm 3+ /Dy 3+ /Eu 3+ single and co-doped LiNbO 3 color tunable phosphors were synthesized via the solid-state reaction. The phase structure, microscopic topography, optical characteristics, decay lifetimes, energy transfer processes，and thermal stability were comprehensively characterized through combined X-ray diffraction analysis, scanning electron microscope, and advanced spectroscopic methodologies. Following further in-depth analysis, the optimal concentration of dopant ions was determined, and the energy transfer effect between activators in the LiNbO 3 matrix was confirmed. The CIE demonstrated that adjusting the doping concentration of rare earth ions makes it possible to achieve polychromatic tunable light, as well as cool and warm white light. Crucially, Li 0.95 NbO 3 :0.01Tm 3+ /0.02Dy 3+ /0.02Eu 3+ phosphor exhibited remarkable thermal stability, maintaining 97.1 % of its initial strength at temperatures of 423 K. Additionally, WLEDs that have been coated with the aforementioned phosphor on a 365 nm NUV chip emit bright white light, exhibiting a color rendering index of 81.3 and correlated color temperature of 5426 K. It is powerfully suggested that the LiNbO 3 :Tm 3+ /Dy 3+ /Eu 3+ phosphors has the potential to become a new choice for WLED application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xu Sun,Yumeng Jia,Jing Wang,Yingnan Dong,Yanhua Sun,Zhongxiang Shi
Na-β"-Al 2 O 3 matrix materials, featuring a stable layered structure and Na + ions double sites, are promising as host materials for luminescent applications. In this work, a series of broadband Na-β"-Al 2 O 3 : x Eu 2+ , 0.08Ce 3+ cyan phosphors were designed and synthesized. Based on the ability of Eu 2+ to occupy two Na + sites in the Na-β"-Al 2 O 3 matrix, the photoluminescence (PL) spectra displayed dual-peak emissions centered at 470 and 500 nm, with a full width at half maximum (FWHM) of 140 nm. The Na-β"-Al 2 O 3 : Eu 2+ , Ce 3+ phosphors have excellent thermal stability (95.1 %@448 K). Finally, the fabricated white-light-emitting diodes (WLEDs) with CIE 1931 chromaticity coordinates of (0.32, 0.35) and a correlated color temperature (CCT) of 6015 K, indicating their potential for application in full-spectrum WLEDs.
研究领域:
材料科学
·
发光材料
·
光电子学
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yi Zhao,Chenyang Shen,Ling Ding,Jianping Liu,Weidong Xiang,Xiaojuan Liang
Cd 2+ doped CsPbBr 3 perovskite quantum dots were synthesized in borosilicate glass for the first time by traditional melting method. By X-Ray Diffraction (XRD) and high resolution electron microscopy analysis, it was proved that Cd 2+ successfully entered the perovskite lattice structure. The samples have good optical properties , high photostability, chemical stability, thermal stability and water stability. On this basis, CsPb 0.7 Cd 0.3 Br 3 QDs glass, commercial red phosphor (CaAlSiN 3 :Eu 2+ ) and blue light chip were coupled to produce white LED devices. This discovery opens up a new way for the application of metal ion-doped perovskite QDs glass in optoelectronic devices.
研究领域:
光电子器件
·
材料科学
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 26
·11596-11606
·
IF 3.591
Zhenxing Qin,Ming Wen,Jingjing Bai,Junchao Cui,Runze Miao,Xuewen Zhang,Qingmei Zhang,Rui Zhang,Xiujuan Du
The development of C-Dot-based fluorescent materials with multicolor emissions in the solid state is critical in photoelectric imaging and lighting; however, it is still a challenge to obtain such materials with high optical performances on account of the serious self-quenching generated from the clusters of C-Dots. Here, a one-pot solvothermal method to synthesize S,N-codoped and Si-coupled solid-state carbon nanodot composites (S,N-CNDs/silica) is reported. Leveraging regulating the content of a dopant and the volume ratio of H2O and EtOH solvents, which result in different surface structures of CNDs and CNDs/silica composites during the cross-linked coupling reaction, the PL emissions of the resulting composites shifted from blue to olivine to classify into blue, green, and olivine corresponding to the fluorescence quantum yields (FLQYs) of 10%, 51%, and 9%, respectively. Clearly, the green emitting CNDs/silica composite (G-CNDs/silica) has the highest value, which can be applied to detect latent fingerprints and fabricate LED devices. The result shows that rich details in latent fingerprints can be recognized by the imaging of G-CNDs/silica powder and the WLED device using G-CNDs/silica as a green phosphor to obtain a very high color rendering index (CRI) of 94.2 at a CIE of (0.34, 0.33).
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 2
·e70588
·
IF 4.2
Xingbo Kang,Fan Li,Zhiyuan Pan,Qi Zhu,Ji-Guang Li
Without using any organic additive, zircon-type (space group I 4 1 / amd ) (Lu 1− x Sc x ) 0.99 VO 4 :0.01Bi 3+ ( x = 0−1, 0.1 interval) nano/microcrystals were successfully synthesized via a hydrothermal reaction at 180°C for 24 h. The products were systematically characterized via XRD, FE-SEM, TEM, elemental mapping, and optical spectroscopy to investigate the effects of Sc 3+ doping on crystal structure, morphology, and luminescent properties. It was found that with the substitution of Lu 3+ by Sc 3+ , the products gradually transformed from LuVO 4 :Bi 3+ nanocrystals into highly anisotropic ScVO 4 :Bi 3+ microrods preferentially growing up along the [001] direction. The peak wavelength of both excitation and emission almost linearly increased with decreasing cell volume, accompanied by band broadening, which was rationalized by considering crystal field splitting energy ( D q), character of the chemical bond (nephelauxetic effect) and metal to metal charge transfer (MMCT) energy. This finely tunable broadband emission (center wavelength 581−639 nm, FWHM >175 nm) enables the materials to supplement multicolor components, presenting potential for application in phosphor-converted white light-emitting diode (pc-WLED) and others.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Qianqian Wang,Haibo Li,Hua Tong,Jialin Zhu,Jiali Fan,Shifeng Pan,Zhennan Zhou,Wei Liu,Gangfeng Ouyang
The development of single-component white-light emissive phosphors has become a key research area in white light-emitting diode (WLED) technology. However, achieving real color reproduction with an ultrahigh color rendering index (CRI) remains challenging. Herein, a series of 0D hybrid copper halides (TEA) 2 Cu 2 Br 4- x Cl x (TEA = tetraethylammonium, x = 0–4) crystals are designed and prepared by a facile solvothermal method. By controlling the composition ratio of Cl − and Br − , the emission spectra are tunable in visible light region from blue to yellow, and a single-component crystal (TEA) 2 Cu 2 Br 2 Cl 2 with broadband white-light emission and ultrahigh CRI is obtained. Detailed studies on photophysical mechanism demonstrate that the unique 0D structure of (TEA) 2 Cu 2 Br 2 Cl 2 can produce effective emission of self-trapped excitons (STEs), and its dual-band emission phenomenon stems from two STE states in the [Cu 2 Br 2 Cl 2 ] 2− dimer. Moreover, the CIE coordinates of (TEA) 2 Cu 2 Br 2 Cl 2 (0.32, 0.33) are approximated to pure white light (0.33, 0.33), making it an ideal choice for natural WLED applications. A WLED device is fabricated by coating this emitter on a 310 nm UV chip, achieving an ultrahigh CRI of Ra = 95 and R9 = 90. This work provides new design principles for developing eco-friendly white-emission phosphors for single-component solid-state WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lanxuan Yang,Lianjiang Tan,Ruili Xu,Zeyuan Tian,Tian Tian,Zhifu Liu,Lili Liu,Yaoqing Chu
The local crystal-field symmetry within a host material plays a critical role in modulating the luminescence behavior of Sm 3+ ions. In this study, we propose a novel Si 4+ doping strategy to enhance the photoluminescence properties of Sm 3+ in a Sr 3 Ga 2 Ge 4 O 14 host, with the effects proposed to be associated with alterations in the symmetry of the local coordination environment. A series of Si 4+ /Sm 3+ co-doped phosphors was synthesized via solid-state reaction. At an optimal Si 4+ doping level of 50 mol%, the emission intensity of Sm 3+ increased by approximately 40%. Further introduction of K + as a charge compensator considerably improved the internal quantum efficiency from 25.12% to 47.28% and color purity from 96.8% to 99.9%. A prototype WLED using the optimized phosphor exhibited a low CCT (5769 K) and a high CRI ( R a = 87.6), satisfying the requirements for indoor lighting. The phosphor was also incorporated into a PVA-based anti-counterfeiting ink, showing bright, stable, and substrate-independent UV-excited fluorescence. This work provides a feasible doping strategy for developing high-performance orange-red phosphors and demonstrates their potential in high-quality WLED and advanced anti-counterfeiting applications.
研究领域:
材料科学
·
光子学
·
固态化学
·
光电子器件
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yiying Zhu,Yining Wang,Yixin Sun,Zheng Xu,Mengmeng Shang
Lead-free double perovskites (LFDPs) usually exhibit poor luminescent performance, and doping lanthanide ions (Ln 3+ ) presents a promising solution to solve this problem. However, most Ln 3+ ions face difficulties in incorporating into LFDPs due to the mismatch in radius or valence state. Here, we successfully synthesized rare-earth (RE 3+ ) based Cs 2 NaLuCl 6 (CNLC) LFDPs and achieved efficient green emission through doping Tb 3+ into CNLC. Introducing Sb 3+ improves the absorption efficiency of CNLC: Tb 3+ from 25.1 % to 73.5 % by establishing an energy transfer channel from Sb 3+ to Tb 3+ . Benefiting from the energy transfer, the CNLC: 0.01Sb 3+ , 0.10Tb 3+ phosphor produces blue-green dual emissions, highlighting its potential in white light-emitting diodes (WLEDs). In addition, an anti-counterfeiting pattern composed of CNLC: Sb 3+ , CNLC: Tb 3+ , and CNLC: Sb 3+ , Tb 3+ samples was fabricated, which shows their promising prospect in anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Bojun Lin,Yanjie Zhang,Zihan Zhao,Herui Zhao,Jingjie Yu
Eu 2+ /Eu 3+ co-doped Ca 5 (PO 4 ) 3 F (FAP) phosphors with tunable color of red/blue (R/B) emission were successfully synthesized by the two-step method for potential applications in light-emitting diodes (LED). Eu 2+ (or Eu 3+ ) single-doped and Eu 2+ /Eu 3+ co-doped FAP all showed pure hexagonal FAP crystal with space group P6 3 /m, indicating the occupation of Ca sites by Eu 2+ and Eu 3+ ions. Typically, Ca 5 (PO 4 ) 3 F: Eu 2+ phosphors exhibited a broad blue emission band at 451 nm under 293 nm excitation and Ca 5 (PO 4 ) 3 F: Eu 3+ samples emitted strong orange-red light at 596 nm, 615 nm and 620 nm under 394 nm excitation. Further, Eu 2+ /Eu 3+ co-doped FAP phosphors obtained by the two-step method depicted the blue emission at 451 nm (Eu 2+ ions) and the orange-red emission (Eu 3+ ions) at 596 nm, 615 nm and 620 nm with an excitation wavelength of 365 nm (NUV). The tunable R/B ratio from 0.079 to 7.035 with various CIE chromaticity coordinate can be achieved by adjusting the recalcined temperature in the second step. Ca 5 (PO 4 ) 3 F: Eu 2+ , Eu 3+ sample can be packaged with green Lu 3 Al 5 O 12 (LuAG) phosphors by 365 nm chip (1 W) and the cold white light with CIE chromaticity coordinate (0.2815, 0.3485) (CRI: 73, CCT: 7973 K) is achieving. Based on Ca 5 (PO 4 ) 3 F: Eu 2+ , Eu 3+ and 25B 2 O 3 -10SiO 2 -35ZnO-6Li 2 O-12La 2 O 3 -12WO 3 (BS-glass) (in mol%) with strong mechanical strength as a great binder, the remote-excited color convertor (PiG: phosphor in glass) has been fabricated by screen printing technology for NUV-WLED application. Finally, by comparing the working temperature of PiG and pc-WLED at the same operating time, the working temperature of PiG was stable at 32 °C when remote excitation lighting was applied, which greatly avoided the phenomenon of “thermal quenching” for phosphors caused by high temperature under the operating of WLED. Thus, it was demonstrated that Eu 2+ and Eu 3+ co-doped Ca 5 (PO 4 ) 3 F phosphors with tunable red/blue emitting would be a highly potential candidate for NUV-WLED.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Nan Yang,Zhuo Li,Ziwang Zhang,Wen He,Zhibin Ye,Weijie Huang,Jianxin Shi,Yexiang Tong
Recently, more and more attention has been concentrated on luminescence materials activated with rare-earth ions for white light-emitting diodes (WLEDs) or optical thermometers. However, due to their opposite requirements for thermal response, it is hard to realize the above dual applications in the same material. Herein, a red-emitting tantalate phosphor, Gd 3 TaO 7 :Eu 3+ , was designed and prepared to solve the problem. The emission of Eu 3+ in the phosphor was surprisingly observed to be different from that in most of the reported red phosphors activated with Eu 3+ , that is, the emissions coming from the f - f transitions of Eu 3+ exhibit severe splitting, and the intensities of several strong transitions are not very different. According to the structural and spectral analyses, the reasons may be the highly covalent and polarized lattice environments of Eu 3+ in this material. When excited with 393 nm, the temperature-dependent photoluminescence (TDPL) of Gd 3 TaO 7 :Eu 3+ presents a normal thermal quenching and the integrated intensity at 500 K keeps 90.8 % compared to that at 300 K. Whereas the TDPL presents an edge abnormal thermal quenching phenomenon upon the excitation of 330 nm. Taking advantage of the special TDPL characteristics, a WLED device and a multiple-mode optical thermometer are successfully realized in this material. The former has excellent performances with high Ra of 88.8 and low CCT of 3882 K, and the latter includes one type of excitation intensity ratio and two types of fluorescence intensity ratio with the maximal relative temperature sensitivities of 0.92 % K −1 , 0.97 % K −1 and 0.92 % K −1 , respectively. The results reveal that Gd 3 TaO 7 :Eu 3+ phosphor has a great prospect in WLED and multiple-mode optical temperature sensor dual-applications, and this work may provide a new and effective strategy for developing multifunctional optical materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 18
·6299-6305
·
IF 7.059
Xinlong Dong,Yuexiao Pan,Yajun Jia,Rongjing Liu,Hongzhou Lian,Jun Lin
Mn4+-activated red phosphors have recently attracted tremendous attention for their fascinating performance in white light emitting diode (WLED) applications, achieving warm white light, while the thermal stability of fluorides is still considered as a drawback. Herein, we report a novel red phosphor composed of Ba3Sc2F12:Mn4+ (BSF:Mn), in which the emitting centers of Mn4+ ions are located in the sites of Sc3+ ions. The photoluminescence of BSF:Mn varies with the concentration of K2MnF6, reaction temperature, and the concentrations of NH3·H2O in the reaction system. Partly substituting Ba2+ with Ca2+ decreases the luminescence intensity of BSF:Mn. By employing the as-prepared phosphor BSF:Mn as a red component, a high-performance WLED with a correlated color temperature (CCT) of 4796 K and a color rendering index (CRI) of 85.2 was obtained. The phosphor BSF:Mn remains undecomposed up to 800 °C; therefore, this work provides a strategy to explore a novel Mn4+-doped fluoride with particularly good thermal stability.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）