JOURNAL OF RARE EARTHS
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2017
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IF 2.429
Jiansheng Huang,Ronghui Liu,Yuanhong Liu,Yunshen Hu,Guantong Chen,Chunpei Yan,Junhang Tian,Bin Hu
Eu 2+ activated BaSi 2 O 2 N 2 oxynitride bluish-green phosphor was synthesized adopting conventional high-temperature solid-state reaction method, in which BaF 2 , Na 2 CO 3 and NH 4 Cl were used as the fluxes. The phase formation, size distribution and microscopic morphology were characterized to investigate the influence of adding fluxes on photoluminescence properties. The results indicate that with the addition of BaF 2 flux, the particle morphology becomes regular and size distribution narrows and the phase purity of BaSi 2 O 2 N 2 :Eu 2+ phosphor can be improved effectively. The photoluminescence intensity of BaSi 2 O 2 N 2 :Eu 2+ phosphor with BaF 2 as flux gets enhanced obviously, which is much higher than that of Na 2 CO 3 , NH 4 Cl and without flux. The optimum content of BaF 2 flux is 4 wt%, and the maximum photoluminescence intensity of the BaSi 2 O 2 N 2 :Eu 2+ phosphor prepared with BaF 2 flux rises to 141%, meanwhile, the phosphors with BaF 2 flux exhibits low thermal quenching. The results indicate that the BaSi 2 O 2 N 2 :Eu 2+ is sort of promising bluish-green phosphor for application in full-spectra LED.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Gaoliang Wang,Jian Li,Liuyang Xu,Honglei Yuan,Xianke Sun
Bi 3+ activated phosphors show potential applications in white light emitting diodes. Here, Bi 3+ activated SrBaGdGaO 5 phosphors with different Bi 3+ concentrations were prepared. The phase and oxidation states, absorbance/excitation/emission spectra, decay characteristics, and thermostability were researched. Depending on excitation of NUV light, the Bi 3+ activated SrBaGdGaO 5 phosphors emit cyan light originating from the radiative 3 P 1 → 1 S 0 transitions of Bi 3+ . On the basis of temperature-dependence emission spectra, the activation energy was calculated as 0.305 eV. The warm white light with a correlated color temperature of 4106 K and a color rendering index of 89.2 was emitted by the WLED device consisting of near ultraviolet LED chips, SrBaGdGaO 5 :Bi 3+ and CaAlSiN 3 :Eu 2+ phosphors. The luminescence performance of the cyan SrBaGdGaO 5 :Bi 3+ phosphors indicates that they can remedy the cyan absence for full spectrum white lighting emitting diodes.
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
Yue Yang,Rong Tang,Yuqi Lei,Di Gao,Houteng Zhao,Samra Jabeen,Yufeng Du,Ya Yang,Chenyi Wang,Xinyue Zhang,Ruijin Yu,Xianchao Du
To realize full-spectrum illumination systems for daily applications, the development of cyan-emitting phosphors capable of addressing the spectral deficiency in the 480-520 nm region (between blue and green emissions) has emerged as a critical research frontier in solid-state lighting technology. In this investigation, a scandium silicate phosphor, KSr 6 ScSi 4 O 16 :Eu 2+ , was initially synthesized via a high-temperature solid-state reaction under a reducing atmosphere. The target compounds crystallize in an orthorhombic system with a centrosymmetric space group of Pnma (No. 62). KSr 6 ScSi 4 O 16 :2 mol%Eu 2+ shows asymmetric broadband mainly at 481 nm under excitation of 359 nm. Based on Gaussian fitting and Van Uitert's equation, the Eu 2+ ion was confirmed to occupy two different coordination environments of Sr 2+ , producing two different luminescent centers at 477 nm and 528 nm. The optimal doping concentration of KSr 6 ScSi 4 O 16 : x Eu 2+ cyan phosphors was founded to be 2 mol%. Within the temperature range of 300 to 480 K, CIE coordinates remain stable during the heating process, and an activation energy of 0.35 eV has been determined. The color rendering index ( R a ) of the full spectrum WLED produced by KSr 6 ScSi 4 O 16 :Eu 2+ , reached 92.5, which is higher than the WLED packaged with commercial powder, effectively supplementing the cyan light component and closer to the full-spectrum lighting LEDs.
研究领域:
材料科学
·
固态照明技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenjie Deng,Decai Huang,Fengli Yang,Jiaqing Peng,Weixiong You,Xinyu Ye
Efficient cyan-emitting phosphor plays an important role in the development of solid-state lighting, which is indispensable to filling the cyan gap for full-spectrum warm-white light-emitting diodes (WLEDs) with high color rendering index (CRI). Herein, a novel highly efficient broadband cyan phosphor Ce 3+ -doped Ca 3 HfAl 2 Si 2 O 12 (CHASO: Ce 3+ ) garnet compound was developed by the substitution of Lu 3+ -Al 3+ with Ca 2+ -Hf 4+ /Si 4+ in Lu 3 Al 5 O 12 . The crystal structure and photoluminescence (PL) properties of CHASO: Ce 3+ were investigated in detail. Notably, CHASO: Ce 3+ phosphor can be effectively excited by violet light (390 – 430 nm) and exhibited bright cyan emissions around 490 nm with high PL internal quantum yields of 89.2 %. Moreover, the integrated PL intensity of the phosphor at 423 K was 66.3 % of that at room temperature. Finally, by incorporating CHASO: 11 %Ce 3+ with commercial blue/yellow/red phosphor onto a violet LED chip (400 nm), the prototype full-spectrum WLEDs device exhibits warm white light with high color rendering index (CRI, Ra and R9 > 90) and low correlated color temperature 3301 K. These results suggest the highly efficient phosphor CHASO: Ce 3+ is promising for low-blue full-spectrum healthy lighting.
研究领域:
材料科学
·
光电技术
·
固态照明
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）