CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
L. Yue,X.Z. Zheng,P.J. Xia,C. Wang,Y.F. Lei,M. Xu,W.B. Dai
Rare-earth (RE) and/or transition metal (TM) ions (co)doped phosphors have garnered much attention for promoting development in the fields of solid state lighting (SSL) and displays. It is a meaningful work to design high-quality phosphor via intelligent assembling from wide variety of compounds with RE/TM ions. Herein, the lanthanum borophosphate La 7 O 6 (BO 3 )(PO 4 ) 2 (LOBP) and Bi/Eu were selected as host and dopants for constructing the phosphor LOBP: Bi/Eu via solid phase synthetic method due to simple synthesis, chemical/thermal stability, rich cationic sites, appropriate bandgap, and controllable optical tuning from synergistic effect of cyan (Bi) and red (Eu) emissions, respectively. The structure and site occupations were analysed via XRD and Rietveld refinements , showing Bi 3+ ions were only resided in La 3+ sites within the monoclinic matrix (P2 1 /n) and appeared greater inclination towards the La sites with coordinate number ( CN ) = 8 as compared with CN = 7 due to the closer ion radius ratio. While Eu 3+ ions entered into the two distinct La sites with almost the same probability. The morphology and elemental mapping were obtained via SEM/EDS, exhibiting irregular particle shape with micron-level size, and the chemical composition met expectation. Through energy transfer (ET) from Bi to Eu under n -UV excitation, the adjustable photoluminescence (PL) from cyan traversing white and finally to red could be achieved. The concentration quenching for both singly- (Bi) and co-doped (Bi/Eu) phosphors were charged by the d-d interactions. Finally, the stable as-fabricated n -UV pumped w LED via coupling the composition-optimized white-emitting LOBP: 2%Bi, 7%Eu to a commercial 305 nm n -UV LED chip shows splendid performances.
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
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yujie Chen,Fanlei Qin,Jiawen Wang,Kai Yang,Yinyan Li,Gongxun Bai
Perovskite quantum dots with halogen elements (Cl, Br, I) have been extensively studied due to their unique optoelectronic properties. However, the spectral properties of luminescent materials continue to present challenges in perovskite quantum dot glasses. Here, Eu3+-doped CsPbBr3 quantum dot glasses were successfully prepared. Meanwhile, optimizing the doping concentration of Eu3+ significantly improved the formation of quantum dots and enhanced their fluorescence intensity. After a heating–cooling cycle, the CsPbBr3:0.5% Eu3+ glass still retained 95% of its initial value. By coating CsPbBr3:0.5% Eu3+ glass powder with red phosphor on a blue chip, a white LED with a CCT of 5417 K can be prepared. Therefore, Eu3+-doped CsPbBr3 quantum dot glasses demonstrate significant potential as an efficient material for optical lighting applications.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyu Zhang,Wanyuan Li,Chao Wang,Lin Zhang,Shuxing Li,Rong-Jun Xie
β-Sialon:Eu 2+ (Si 6-z Al z O z N 8-z :Eu 2+ , 0 < z ≤ 4.2) has been recognized as an excellent narrow-band green phosphor for wide-color-gamut backlights, but it is quite difficult to realize high quantum efficiency when further reducing the bandwidth of β-Sialon:Eu 2+ to achieve high color purity. Herein, we propose an ingenious sintering method to minimize the trade-off between color purity and luminescence intensity of β-Sialon:Eu 2+ , and finally obtain ultra-narrow band β-Sialon:Eu 2+ with an emission maximum of 527 nm, a full width at half maximum of 44.9 nm and an external quantum efficiency of 37.3 % when z is reduced to 0.03. Structural analyses indicate that β-Sialon:Eu 2+ shows higher structural ordering and rigidity with decreasing the Al-O substitution ( i.e. , z value). By combining β-Sialon:Eu 2+ (z = 0.03), a red phosphor K 2 SiF 6 :Mn 4+ with a blue InGaN LED chip, white light-emitting diodes with a luminous efficacy of 93.91 lm W −1 and a color gamut as high as 101.2 % National Television System Committee standard were demonstrated, which are superior to those in color gamut (4.3–16.8 % up) by using commercial β-Sialon:Eu 2+ .
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
·
2025
·
IF 5.6
C.X. Chen,X.Z. Zheng,W.B. Dai,C.Y. Ni,W.Y. Li,D. Wu
As energy consumption intensifies, energy saving and environmentally friendly phosphor-converted white light-emitting diodes (pc- w LEDs) have become the current research hotspots. The garnet-based CaY 2 Al 4 SiO 12 (CYAS) phosphors, with their abundant lattice sites and stable physical properties, are ideal candidates as phosphor hosts. Through comprehensive experimental and theoretical analyses, including XRD/Rietveld refinement and density functional theory (DFT) calculations, it was determined that Bi 3+ /Tb 3+ /Sm 3+ ions preferentially occupy the Y 3+ lattice site. The luminescence properties and thermal stability of CYAS: Bi 3+ /Tb 3+ /Sm 3+ have been extensively investigated. The quantum yield (QY) has been enhanced to 48.3 % due to energy transfer (ET), which is not a significant difference compared to existing phosphors, and by superposition of blue (Bi, 3 P 1 → 1 S 0 ), green (Tb, 5 D 4 → 7 F 5 ), and red (Sm, 4 G 5/2 → 6 H 5/2 ) emission, resulting in tunable spectrum and high-quality, full-spectrum white light emission. Finally, the w LED device with high color rendering index (CRI, 87), high luminous efficiency (LE, 74 lm·W −1 ), and low correlated color temperature (CCT, 4747.56 K) were fabricated by a remote ‘encapsulation’ packaging strategy, suggesting that the phosphor can be applied to high quality white light illumination.
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 SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Yue-Yu Ma,Hong-Mei Pan,Dong-Yang Li,Yu-Hang Liu,Tian Lu,Xiao-Wu Lei,Zhihong Jing
Low-dimensional hybrid antimony halide perovskites have fascinated the extensive research for their excellent photoluminescence behaviors. However, reasonable optimization of luminescence performance through molecule-level structural regulation remains a formidable challenge. The solution evaporation method with the reaction of organic amines and acid solutions of metal salts is a well-established method for the synthetic of low-dimensional hybrid antimony halide . In this work, by selecting organic cations with different sizes as template molecules, we have successfully synthesized three hybrid antimony halides of 0D [HDBA] 2 SbCl 5 ( 1 ), 0D [H 2 ATMP] 2 SbCl 7 ( 2 ) and 1D [H 3 PMDETA]Sb 2 Cl 9 ( 3 ) (DBA = dibutylamine, ATMP = 4-amino-2,2,6,6-tetramethylpiperidine, PMDETA = N,N,N′,N″,N″-pentamethyldiethylenetriamine). by the solution evaporation method at room temperature for 2–5 days. These hybrid antimony halides exhibit broadband yellow-light with the highest photoluminescence quantum yield (PLQY) of 8.38%. According to detailed spectroscopy characterizations and theoretical calculations, the broadband light emissions should originate from self-trapped excitons (STEs). These antimony halides could be fabricated as white LEDs with highest color rendering index (>90%). The intrinsic broad-band light emissions and facile assembly process enable these hybrid antimony halides as promising candidates for yellow-light emitting materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Hua Yu,Bingxue Yao,Degang Deng,Leifeng Chen,Hongting Zhao,Yinqun Li,Youjie Hua,Shiqing Xu
A novel tunable red to yellow emitting phosphor, (Ca, Ba) 4 (PO 4 ) 2 O:Eu 2+ is reported that displays a broad emission from 500 to 800 nm, and its emitting color can be adjusted from red to yellow by changing Ba 2+ doping concentration. X-ray powder diffraction (XRD) analysis confirmed the phase formation. Excitation and emission spectra, and concentration dependence of emission intensity of the phosphor were investigated. The results showed that the emission peak wavelength take blue-shifted from 640 to 545 nm and the color hue can be tuned from red to yellow with increasing Ba 2+ concentration. When single-phase (Ca 3.85 Ba 0.10 )(PO 4 ) 2 O:0.05Eu 2+ phosphor is pumped by a blue InGaN light-emitting diode, we obtain white light with color rending index ( R a ) between 84.0 and 90.6 and color temperatures between 4000 and 5500 K, which suggests that this material is competitive as a color conversion material for solid state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu He,Zongqing Jin,Guanjun Xiao,Bo Zou,Qingqin Ge,Nannan Shi,Liwei Jiang,Cheng Sun,Tao Xiong,Yinan Zhang
To circumvent the toxicity problem of lead, looking out for lead-free perovskites with a broadband emission and associated LEDs that cover the full region of white light is the key to research in sustainable chemistry and material community. In order to improve the luminescence properties of inorganic lead-free perovskites, chemical doping engineering is utilized. We have found that yttrium plays an important role as a dopant in broadening the emission of inorganic perovskites. This work reports on white light emission in a yttrium-doped tin perovskite and the white LED synthesized with this eco-friendly phosphor. The hue of the light can be adjusted via the change in the excitation wavelength. DFT is performed to calculate the band gaps, and a good agreement with the experimental results is illustrated. The dramatic fluorescence enhancement (by a factor of about 4.5) is also revealed on the phosphor. Based on this sustainable material, a WLED is fabricated, and a full-color white light emission is realized with a CIE of (0.32, 0.33). This work not only provides us with an inorganic phosphor for white LEDs but also demonstrates the potential of the chemical doping strategy in sustainable chemistry and materials science.
研究领域:
材料科学
·
化学工程
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Jiangyuan Jiang,Shuai Zhang,Qingsong Shan,Linxiang Yang,Jing Ren,Yongjin Wang,Seokwoo Jeon,Hengyang Xiang,Haibo Zeng
White light-emitting diodes (WLEDs) are the key components in the next-generation lighting and display devices. The inherent toxicity of Cd/Pb-based quantum dots (QDs) limits the further application in WLEDs. Recently, more attention is focused on eco-friendly QDs and their WLEDs, especially the phosphor-free WLEDs based on mono-component, which profits from bias-insensitive color stability. However, the imbalanced carrier distribution between red-green-blue luminescent centers, even the absence of a certain luminescent center, hinders their balanced and stable photoluminescence/electroluminescence (PL/EL). Here, an In 3+ -doped strategy in Zn-Cu-Ga-S@ZnS QDs is first proposed, and the balanced carrier distribution is realized by non-equivalent substitution and In 3+ doping concentration modulation. The alleviation of the green emitter by the In 3+ -related red emitter and the compensation of blue emitter by the Zn-related electronic states contribute to the balanced red-green-blue emitting with high PL quantum yield (PLQY) of 95.3% and long lifetime (T 90 ) of over 1100 h in atmospheric conditions. Thus, the In 3+ -doped WLEDs can achieve exceedingly slight proportional variations between red-green-blue EL intensity over time (∆CIE = (0.007, 0.009)), and high champion CRI of 94.9. This study proposes a single-component QD with balanced and stable red-green-blue PL/EL spectrum, meeting the requirements of lighting and display.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 23
·5495
·
IF 4.2
Anlin Zhang,Yue Yang,Yuqing Peng,Hao Zhou,Wei Tang,Jianhong Jiang,Yiting Wu,Shiying Cai,Lianwu Xie,Bin Deng
In this study, a series of Sr6LuAl(BO3)6:Sm3+red phosphors were successfully prepared with a high-temperature solid-phase technology. The Rietveld refinement analysis of the X-ray diffraction (XRD) diffraction patterns indicated that the as-prepared phosphors belong to theR3¯space group of the hexagonal crystal system. Under 404 nm near-ultraviolet excitation, the Sr6LuAl(BO3)6:Sm3+phosphor exhibits narrowband emission within the range of 550 to 750 nm. The primary emission peak is observed at a wavelength of 599 nm, corresponding to6H5/2→4F7/2. The optimum doping concentration of the Sr6LuAl(BO3)6:xSm3+phosphor is 10 mol%. Nearest-neighbor ion interaction is the mechanism of concentration quenching. The synthesized phosphors demonstrate exceptional thermal stability, with a high quenching temperature (T0.5> 480 K). Furthermore, the assembled white light-emitting diode (w-LED) device exhibits a low color temperature (5464 K), an excellent color rendering index (Ra= 95.6), and CIE coordinates (0.333, 0.336) close to those of standard white light. Collectively, these results suggest the enormous potential of Sr6LuAl(BO3)6:Sm3+phosphors for applications in w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
S. Wu,Y. Fu,Q. Liu,P. Xiong,D. Wang,G. Zhang,S. Yuan,Y. Chen
Developing highly efficient cyan-emitting fluorescent materials is essential to bridge the cyan gap in phosphor-converted white light-emitting diodes for full-spectrum white illumination. Here, a Bi-doped cyan phosphor has been reported to solve this gap. The phase purity, photoluminescence emission/excitation spectra, concentration quenching, lifetime decay curves, and temperature-dependent photoluminescence emission spectra were systematically investigated. SrLaGaO 4 :Bi 3+ exhibits a broad excitation band (250–400 nm), which matches with the emission of a commercial near-ultraviolet light-emitting diode chip. The cyan light peaked at 475 nm is observed, which is attributed to the 3 P 1 → 1 S 0 transition of Bi 3+ . The thermal quenching experiment was performed, and the activation energy was calculated as 0.36 eV. Finally, full-spectrum white light-emitting diode devices were fabricated using SrLaGaO 4 :Bi 3+ phosphors, commercial blue BaMgAl 10 O 17 :Eu 2+ phosphor, green (Ba, Sr) 2 SiO 4 :Eu 2+ phosphor, and red CaAlSiN 3 :Eu 2+ phosphor, which displayed an International Commission on an illumination coordinate of (0.3732, 0.3850), a correlated color temperature of 4290 K, and a color rendering index of 93.2 at a drive current of 20 mA. This result indicates that SrLaGaO 4 :Bi 3+ plays an essential role in bridging the cyan gap, providing new inspiration for applying cyan-emitting phosphors in full-spectrum white lighting.
研究领域:
材料科学
·
光学工程
·
固态照明
·
发光材料
·
无机化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Sai-Nan Guo,Hao Wu,Dan Wang,Jie-Xin Wang
Lead halide perovskite quantum dots (QDs) are known as prospective optoelectronic device materials because of their excellent luminescence, extraordinary photoelectric performance, and specific octahedron framework. Herein, we report a cost-effective approach for synthesizing highly stable CH3NH3PbBr3 QDs in low-polarity binary solvents without nitrogen protection. The CH3NH3PbBr3 QDs are tunable from 1.2 to 4.2 nm by adjusting the proportion of oleic acid and oleylamine as capping ligands. The photoluminescence quantum yield of CH3NH3PbBr3 QDs can reach 87.4%. The fluorescence can maintain over 80% of its earliest emission intensity under the atmosphere after 5 days, which is much better than that (∼10%) of QDs with ligand-assisted reprecipitation. The possible reaction mechanism of preparing CH3NH3PbBr3 QDs was also addressed. Notably, such a strategy can be applied extensively in the preparation of other lead halide perovskite QDs. Furthermore, the as-prepared thick PMMA-coated CH3NH3PbBr3 QDs were further conjoined with a red luminescence powder on a blue InGaN chip to obtain a powerful efficiency (45.4 lm W–1) warm white light-emitting diode.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）