Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 6
·1863-1875
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IF 7
Shengjian Jiao,Ran Pang,Jiutian Wang,Tao Tan,Chengyu Li,Hongjie Zhang
The currently available commercial white light-emitting diodes (WLEDs) suffer from a poor spectral continuity due to the absence of cyan light. Satisfactory bright cyan phosphors are urgently needed to promote the performance of WLEDs. Herein, we report a bright cyan-emitting phosphor Ba6BO3Cl9:Eu2+. The internal quantum efficiency and external quantum efficiency of the Ba6BO3Cl9:Eu2+ phosphor were measured to be 86.2% and 41.3%, respectively. Also, this phosphor exhibits strong endurance to luminescence thermal quenching, with the luminescence intensity at 150 °C retaining 93.9% of the value at room temperature. When applied in full-spectrum phosphor-converted WLEDs, the Ba6BO3Cl9:Eu2+ phosphor may efficiently compensate for the lack of cyan light emission of WLED devices prepared using blue/yellow/red phosphor strategies and also contribute to the improvement of Ra (color rendering index) of WLED devices based on RGB (red/green/blue) phosphor strategies. In addition, the Ba6BO3Cl9:Eu2+ phosphor can be applied as an independent efficient blue-cyan component to replace the blue light component in common WLEDs and reduces the proportion of high-energy blue light that is harmful to vision protection. These results demonstrate that Ba6BO3Cl9:Eu2+ will have a wide range of potential applications in indoor healthy lighting as a cyan phosphor.
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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发光材料
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DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yun Tang,Miao Wang,Yalou Xin,Xiaohu Ren,Hudie Yuan,Nan Yan
Perovskite quantum dots (PQDs) and K2SiF6:Mn4+ (KSF) phosphor, renowned for high color purity, are prime candidates for emitters in white light-emitting diodes (WLEDs) for wide color gamut displays. To enhance the luminous efficacy (LE) and working stability of PQDs and KSF-integrated WLEDs, intricate fabrication processes, involving multiple post-treatments of PQDs and their blending with KSF, are often necessitated, inevitably compromising the production efficiency of the device. Herein, we develop a facile in situ synthesis approach that not only effectively passivates surface defects in PQDs and enhances their stability but also simplifies the fabrication process of PQDs and KSF-integrated WLEDs. Specifically, the silica-coated PQDs/KSF (PQDs/KSF@SiO2) composite is synthesized via the in situ growth of MAPbBr3 on an ethanol-treated KSF surface followed by SiO2 encapsulation. The Pb–F coordination and SiO2 encapsulation enable high luminescence intensity and simultaneously enhanced photothermal stability of PQDs. Eventually, the WLED based on PQDs/KSF@SiO2 achieves a high LE of 83.11 lm·W–1 alongside a wide color gamut of 122.6% NTSC standard. Remarkably, the device exhibits excellent working stability, preserving its high LE virtually unaltered after 4 h of continuous operation. This work provides a facile approach to yield WLEDs with superior LE, wide color gamut, and exceptional working stability, positioning them ideally for practical display applications.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 6
·450
·
IF 3.2
Sun Huapeng,Zhang Anlin,Zhang Yu,Li Linghuan,Deng Xiaohong,Zhong Min,Deng Bin
The pursuit of white light-emitting diodes (WLEDs) with high color rendering index (CRI) and stable chromaticity remains a significant challenge. This work presents a novel oxyapatite-type ZnLa 4 (SiO 4 ) 3 O:Dy 3+ phosphors as a key component to address this issue. Under 387 nm excitation, the optimized ZnLa 4 (SiO 4 ) 3 O:2 mol%Dy 3+ phosphor exhibits intense emissions at 480, 572, and 663 nm, corresponding to the electronic transitions from the 4 F 9/2 level to the 6 H 15/2 , 6 H 13/2 , and 6 H 11/2 levels, respectively. The concentration quenching mechanism is identified as dipole–dipole interaction, with the optimal doping level at 2 mol%. The phosphor demonstrates excellent color stability, emitting in the yellow region. More importantly, the WLED fabricated with this phosphor exhibited a high CRI ( R a = 89), a favorable correlated color temperature (CCT = 5740 K), and CIE (Commission International de L’ Eclairage) coordinates (0.327, 0.334) remarkably close to pure white light (0.333, 0.333). These results underscore the great potential of ZnLa 4 (SiO 4 ) 3 O:Dy 3+ phosphors for high-quality solid-state lighting.
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Laser & Photonics Reviews
·
2022
·Vol. 16
·期 12
·2200473
·
IF 10.947
Shuai Huang,Mengmeng Shang,Yu Yan,Yining Wang,Peipei Dang,Jun Lin
Phosphor-converted white light-emitting diodes (WLEDs) are extensively spread to every part of our daily life and trigger urgent needs for discovery of phosphors without cyan gap (spectral missing in the 480–520 nm range) in pursuit of “human-centric” sunlight-like full-spectrum lighting. Here, a new ultra-broadband green-emitting K 3 La(PO 4 ) 2 :Eu 2+ phosphor is reported to meet this challenge. An efficient and positive double-heterovalent substitution strategy is proved in K 3 La(Ca/Sr/Ba)(PO 4 ) 2 :Eu 2+ by the evidence of enhanced quantum yield, improved thermal stability, and the tunable luminescence color. The luminescence mechanisms are revealed in this paper. Fabricating a dichromatic 370 nm-UV chip pumped WLED using K 3 La(Ca)(PO 4 ) 2 :Eu 2+ along with a commercially available red phosphor shows a continuity spectrum comparable to the solar spectrum with excellent CIE color coordinates of (0.350, 0.347), low color-correlated temperature of 4853 K, and high color rendering index (Ra) of 96. It is shown that the double-heterovalent substitution contributes to designing and optimizing phosphors for full-spectrum WLEDs.
研究领域:
材料科学
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光学材料
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固态照明
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光子学
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发光材料
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DOI
高影响因子
DYES AND PIGMENTS
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2017
·
IF 3.473
Xiaoxuan Di,Jutao Jiang,Zemin Hu,Lei Zhou,Pengzhi Li,Sijin Liu,Weidong Xiang,Xiaojuan Liang
All-inorganic CsPbX 3 (X = Cl, Br, I) perovskite quantum dots (QDs) have been investigated owing to their novel optical properties , such as the high photoluminescence (PL) quantum yields (QYs), narrow line-with and tunable wavelength. However, the usual CsPbX 3 QDs suffer from the instability and the anion-exchange reaction, which hinder their applications. In this work, we present an efficient approach towards stable solid-state QDs composites by coating the CsPbX 3 QDs with the mesoporous silica matrixes (QDs/silica). The as-prepared QDs/silica composite not only maintain the QDs remarkable optical properties, but also improve their stability. Meanwhile, the approach also prevents the anion-exchange reaction between perovskite QDs of various halide compositions mixed together in the solid-state. Therefore, these excellent properties enable the QD/silica composite to improve the color rending index (CRI) and the correlated color temperature (CCT) of the traditional phosphor-converted white light-emitting diodes (WLEDs). Herein, for the first time, the red QD/silica composite was used as red phosphor and stacked on the Ce 3+ :YAG phosphor-in-glass (Ce-PiG) via screen-printing technology (Ce-PiG&R-QDs/silica). Subsequently, warm WLEDs were constructed by blending the Ce-PiG&R-QDs/silica materials with the InGaN blue chips. More importantly, the constructed WLEDs generate a warm white with an optimal luminous efficacy (LE) of 56 l m/W, a high CRI of 92, R9 of 90 and a low CCT of 4718 K. These results indicate that the QD/silica composites would have potential practical applications in warm WLEDs.
研究领域:
材料科学
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光学工程
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半导体技术
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 22
·225602
·
IF 3.551
Changsong Chen,Dan Li,Yihua Wu,Cheng Chen,Zhi-Gang Zhu,Wan Y Shih,Wei-Heng Shih
Perovskite nanocrystals are a new type of fluorescent material with the advantages of facile preparation process, bright tunable color with high quantum yield. They are ideal candidates for optoelectronic devices such as light-emitting diode (LED) and display. However, for practical applications of iodine-based perovskite nanocrystals, the photostability remains a great challenge because of their sensitivity to environmental factors such as oxygen, humidity etc. In this paper, we improve the photostability of CsPbI3 by introducing the polymethyl methacrylate (PMMA) as a matrix to form flexible perovskite/PMMA composite films. The composite films maintain good photoluminescence quantum yield for 25 d in air and 4 d in water. Furthermore, these films are flexible and can sustain multiple bending and folding while maintaining their photoluminescence properties. This photostability against mechanical deformation allows for the development of flexible devices. As an example, flexible white light-emitting diodes (WLED) were produced with chromaticity coordination (0.31, 0.32), color temperature 6735 K and good stability over time.
研究领域:
材料科学
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光电技术
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纳米技术
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 44
·16421-16432
·
IF 4
Xiaoyi Liu,Haiming Cheng,Hu Wang,Zhu Wen,Guixia Liu,Shengda Liu,Dan Li,Jinxian Wang,Wensheng Yu,Xiangting Dong
Herein, a new organic cationic matrix [N(CH3)4]3MoO3F3 suitable for Mn4+ doping was constructed. Due to the large steric hindrance of N[CH3]4+ (TMA), charge compensation defects can be effectively prevented in the heterovalent Mn4+-doping process, and a high IQE (91.05%) was obtained. Through the cation co-doping strategy, Mg2+/Zn2+/Li+ cations were introduced into the Mo6+ cationic site, which improved the crystallinity of the matrix and reduced energy losses, so as to improve luminescence intensity, QE, thermal stability, water stability and other spectral properties. Meanwhile, [N(CH3)4]2TiF6:Mn4+ phosphors with the same TMA organic cation and equivalent Mn4+ doping were synthesized for comparison, and the effects of the Mg2+ cation co-doping strategy on the spectral properties of phosphors with different matrix types (fluoride/oxyfluoride) and substitution types (equivalent/non-equivalent) were analyzed. These findings provide the basis for the preparation of new luminescent materials. Furthermore, according to the optical properties exhibited by these phosphors, they are packaged into WLED devices with excellent photoelectric properties, which are suitable for indoor lighting and display fields.
研究领域:
材料科学
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光学
·
光子学
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发光材料
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DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Tiejun Zhang,Yayuan Liu,Xuanhang Wang,Xin Qiao,Juan Zhang,Jing Wang,Bo Liu,Jiangyan Wang,Bo Li,Zhongzhi Wang,Pengcheng Hao
Fluorescent glass (PiG) has emerged as an important candidate material in the field of white light-emitting diode (WLED) illumination. However, its conventional preparation processes are often complex and time-consuming, resulting in a significant performance degradation during fabrication. In this study, we carefully designed a SiO2–P2O5–Al2O3–Na2O–K2O–BaO glass composition, which was combined with Y3Al5O12:Ce3+ (YAG:Ce) phosphor via a low-temperature stirring process at 750 °C. This approach aims to minimize the thermal and structural damage to the YAG:Ce phosphor, yielding high-quality fluorescent glass (PiG). For comparison, a control sample (S-PiG) was fabricated using the traditional sintering process, in which glass powder and the same amount of YAG:Ce phosphor were sintered in a muffle furnace. X-ray diffraction and scanning electron microscopy analyses revealed that the mild synthesis method produced fluorescent glass with a uniform microstructure and an ideal crystalline phase, both contributing to the enhanced luminescent efficiency and optical performance. Subsequently, both PiG and S-PiG were coupled to blue LED chips to fabricate WLED devices, and their photoluminescent properties were systematically investigated. The results demonstrated that the newly developed PiG exhibits an excellent luminescent performance under blue-light excitation, achieving an internal quantum efficiency as high as 88.03%. Its emission spectrum covers the ideal white-light region, with a luminous efficacy (LE) of 157.43 lm/W, a correlated color temperature of 6097 K, and CIE chromaticity coordinates of (0.3340, 0.3524). These findings indicate that the low-temperature stirring process effectively preserves the luminescent properties of YAG:Ce phosphors within PiG. This not only highlights the importance of this technique in enhancing the performance of YAG:Ce-based fluorescent glass but also provides a novel and practical approach for future WLED lighting applications.
研究领域:
材料科学
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光学材料
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固态照明
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光子学
·
陶瓷与玻璃
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Weimin Jiang,Shengwei Guan,Chuangyu Wang,Mengxin Chen,Zengming Qin,You Li,Hongwei Ding,Feng Wang
A series of NaLu(MoO 4 ) 2 (NLMO): Sm 3+ phosphors and Sm 3+ , Eu 3+ co-doped NLMO phosphors were synthesized by high-temperature solid-state method. Their crystal structures and luminescent properties were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), fluorescence spectroscopy, fluorescence lifetime, and temperature-dependent emission spectroscopy. XRD results confirm that Sm 3+ and Eu 3+ are successfully doped through isovalent substitution of Lu 3+ sites without destroying the pure NLMO phase structure. Under 405 nm near-ultraviolet excitation, the optimal doping concentration of Sm 3+ is 0.04 mol, and the concentration quenching mechanism is dipole-dipole interaction. Efficient Sm 3+ →Eu 3+ energy transfer is observed in the co-doped system, which is further verified by the fluorescence lifetime measurement of Sm 3+ . The maximum energy transfer efficiency reaches 81%, with the dominant mechanism identified as dipole-dipole interaction. The NLMO:0.04Sm 3+ ,0.07Eu 3+ phosphor exhibits excellent thermal stability, retaining 81% of its emission intensity at 303 K when heated to 383 K, and the thermal quenching activation energy is as high as 0.331 eV. CIE chromaticity coordinates show that the emission color of the phosphor gradually shifts from orange-red to red with increasing Eu 3+ doping concentration, and the correlated color temperature is observed between 1753 K and 2339 K. These results demonstrate that the NLMO:Sm 3+ , Eu 3+ phosphor integrates high energy transfer efficiency, outstanding thermal stability, and precise color tunability, making it an ideal red component for near-ultraviolet excited white light-emitting diodes with significant practical application value.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mingjie Dan,Zhichao Deng,Zijian Kong,Yi Yu,Xiurong Zhu,Huan Ye,Yingying Wang,Zishan Li,Mei Lai,Kenneth R. Poeppelmeier
The realization of white light emission in a single matrix has always been a problem that researchers are working on. As a new luminescent material, lead-free halide double perovskites(DPs) has made this idea possible due to its wide emission spectrum. However, the drawback of low photoluminescence quantum yield (PLQY) originated from self-trapping excitons (STEs) has seriously hindered their development and applications. In this study, we focused on Cs 2 NaGdCl 6 (CNGC) DP nanocrystals, and enhanced the STEs, corresponding to the much developed blue emission intensity at about 470 nm by introducing Sb 3+ , associated with the significant increase of PLQY up high to 90.09 % at the optimal doping level. To achieve the all-spectrum white light within this phosphor, the lack wavelengths at green and red region has to be compensated and Sm 3+ is an ideal candidate. Therefore, the spectrum of CNGC:Sb 3+ was expanded via further co-doping Sm 3+ and consequently the emission color is tuned from blue to white contributed by the effective energy transfer from STEs to Sm 3+ . Finally, an UV-excited LED device based on CNGC:Sb 3+ /Sm 3+ phosphor was fabricated and strong white light emitting was achieved. The CIE of the device coordinates in the cold white region of (0.33, 0.30), associated with the color temperature of 5794 K. All the results indicate that the CNGC:Sb 3+ /Sm 3+ phosphor possesses great potential in the application of full spectrum lighting as prominent single-component white light emitter.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyi Liu,Haiming Cheng,Hu Wang,Yanan Li,Guixia Liu,Shengda Liu,Dan Li,Jinxian Wang,Wensheng Yu,Xiangting Dong
K 3 MoO 2 F 5 ·2H 2 O:Mn 4+ (KMOFM) oxyfluoride red phosphor was synthesized by co-precipitation strategy. Due to the non-equivalent doping of Mn 4+ , the phosphor has a strong ZPL emission peak at 623 nm with high color purity (97%). The crystal field strength and nephelauxetic effect were systematically discussed. By optimizing the synthesis process, the optimal doping concentration of Mn 4+ was determined to be 0.02. The surface modification of organic reagents (paraffin wax (PW), oleic acid (OA) and methyl silicone oil (MSO)) can effectively enhance the luminescence intensity and moisture resistance of the phosphors, and the possible surface modification mechanism was also proposed. Meanwhile, the as-synthesized sample exhibits distinguished UV light-induced stability, and the surface modification can also improve the photoinduced stability. Moreover, the luminescence thermal stability and the thermal quenching mechanism were analyzed in detail. Furthermore, the CCT and CRI of the warm WLED devices prepared by the red KMOFM/surface-modified phosphors and yellow Y 3 Al 5 O 12 :Ce 3+ phosphor are improved obviously, indicating that the prepared sample is a promising red phosphor applied to WLED lighting field. Noticeably, based on the characteristics of high PLQY (63.09%), high color purity (97%) and short fluorescence lifetime (< 4 ms) of the phosphor, we also fabricated a WLED device with wide color gamut (105.1% NTSC value), indicating that the phosphor can also be well applied to the field of wide color gamut fast response backlight display, which greatly expands the application value of the phosphor.
研究领域:
材料科学
·
光电技术
·
照明工程
·
显示技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xingyang Peng,Rongmao Li,Hao Guo,Weihai Chen,Kang Wang,Can Yuan,Xiang Guo,Chaoyong Deng,Ruirui Cui
Existing phosphor materials can hardly meet the demands of multi-scenario applications. The importance of developing novel Sm 3+ doped phosphors with both excellent thermal stability and multifunctional properties is thus emphasised. This paper presents a systematic study of the multifunctional red phosphor Ba 6 La 2 Ga 4 O 15 :Sm 3+ . Under 406 nm excitation, the material exhibits a characteristic red-light emission of 601 nm. Thermal stability tests showed that its luminescence intensity at 423 K maintained 81.84 % of room temperature. The thermometry performance based on the FIR method showed a maximum relative sensitivity of 1.89 %/K and an absolute sensitivity of 0.63 %/K in the range of 298 – 473 K. Application studies show that the encapsulated WLED device has a color temperature of 4878 K and a color rendering index of 91.4, making it suitable for high-rendering white light illumination; In addition, the phosphor enables high-contrast imaging of fingerprint features at levels 1 – 3, which significantly improves latent fingerprint recognition rates. In conclusion, BLGO:Sm 3+ phosphors have shown significant application value in the fields of non-contact optical temperature measurement, high-quality solid-state lighting and fingerprint monitoring.
研究领域:
材料科学
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光学工程
·
固态照明
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法庭科学
·
传感器与仪器
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高影响因子
危险品化学品经营许可证（带存储）