ADVANCED MATERIALS
·
2018
·Vol. 30
·期 38
·1802489
·
IF 21.95
Ming Zhao,Hongxu Liao,Lixin Ning,Qinyuan Zhang,Quanlin Liu,Zhiguo Xia
The discovery of high efficiency narrow-band green-emitting phosphors is a major challenge in backlighting light-emitting diodes (LEDs). Benefitting from highly condensed and rigid framework structure of UCr 4 C 4 -type compounds, a next-generation narrow green emitter, RbLi(Li 3 SiO 4 ) 2 :Eu 2+ (RLSO:Eu 2+ ), has emerged in the oxide-based family with superior luminescence properties. RLSO:Eu 2+ phosphor can be efficiently excited by GaN-based blue LEDs, and shows green emission at 530 nm with a narrow full width at half maximum of 42 nm, and very low thermal quenching (103%@150 °C of the integrated emission intensity at 20 °C), however its chemical stability needs to be improved later. The white LED backlight using optimized RLSO:8%Eu 2+ phosphor demonstrates a high luminous efficacy of 97.28 lm W −1 and a wide color gamut (107% National Television System Committee standard (NTSC) in Commission Internationale de L'Eclairage (CIE) 1931 color space), suggesting its great potential for industrial applications as liquid crystal display (LCD) backlighting.
研究领域:
材料科学
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光学工程
·
固态照明
·
显示技术
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无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Hongran Bao,Hui Lin,Dawei Zhang,Ruijin Hong,Chunxian Tao,Zhaoxia Han,Xiaomeng Yin,Yuxin Pan,Shengming Zhou,Zhi-Jun Zhang,Guanhaojie Zheng
In this work, we report a kind of red emitting phosphor-in-glass (PiG) with low sintering temperature which is more conducive to prevent the denaturation of SrAlSiN 3 :Eu 2+ (SASN:Eu 2+ ) caused by the interface reaction between glass and phosphor. In addition, the PiG contains high content (80 wt%) of phosphor powders, which is beneficial to high power density light excitation. Under the 450 nm excitation the PiG sample showed an internal quantum efficiency value of up to 75.6%, which is close to that of the original powder SASN:Eu 2+ (∼82.3%). When driven by a 1 W blue LD , the luminous efficacy of PiG reached 94 lm/W. The glass powder used as the matrix for PiG is borosilicate glass prepared from LTA zeolite and boron oxide . This glass has good optical properties and chemical stability.
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 ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Baochen Wang,Ziyao Wang,Yangai Liu,Tao Yang,Zhaohui Huang,Minghao Fang
Crystal structure tailoring is a commonly used method for tuning the luminescence of phosphors. This study mainly aims at luminescent spectra tuning of Sr 1− x Ba x Al 2 Si 2 O 8 :Eu 2+ phosphors by substitution of Ba for Sr ions. The phase composition was characterized by X-ray powder diffraction and the crystal structure was determined by using the Rietveld refinement method. The excitation and emission spectra, diffuse reflectance spectra, and thermal quenching were also investigated in detail. The results show that Sr 1− x Ba x Al 2 Si 2 O 8 :Eu 2+ phosphors can form a series of continuous solid solutions in the range from 0 to 0.75. With the increase in x value, the emission spectra show an obvious redshift from 415 to 450 nm. The emission redshift plays an important role in enabling Sr 1− x Ba x Al 2 Si 2 O 8 :Eu 2+ to be used as a standard blue phosphor for application in white-light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Lin Lin,Jixing Chen,Zhezhe Wang,Zhuohong Feng,Feng Huang,Biao Zheng,Lili Huang,Zhipeng Yu,Zhiqiang Zheng
The NaBaPO 4 :Eu 2+ ,Yb 3+ quantum-cutting (QC) phosphors were prepared by the solid-state reaction. We confirm the luminescence of Yb 3+ is mainly derived from QC rather than common down-conversion. The QC efficiency η QE calculated from the luminescence decay curves reached a maximum as high as 197.4%. Furthermore, the QC emission was enhanced by decorating with quasi-spherical and uniform (∼100 nm) Ag nano-particles, due to localized surface plasmon resonance. The enhancement factor reached a maximum as 1.2337.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 26
·2214663
·
IF 19
Teng Zheng,Marcin Runowski,Junpeng Xue,Laihui Luo,Ulises R. Rodríguez-Mendoza,Víctor Lavín,Inocencio R. Martín,Plácida Rodríguez-Hernández,Alfonso Muñoz,Peng Du
To address the unsatisfactory pressure sensitivity of luminescent manometers, Eu 2+ -activated supersensitive microspheres operating in the visible range are developed. A series of Eu 2+ -doped Sr 8 Si 4 O 12 C l8 materials are synthesized as microspheres, and their structural and spectroscopic properties are studied theoretically and experimentally. Excited at 350 nm, the samples emit a bright cyan luminescence at ambient conditions that, upon pressure, changes to green emission and finally to yellow light above 7 GPa. Most importantly, a huge red-shift of the emission band from 497.3 to 568.8 nm is observed as the pressure increases, leading to an ultrahigh-pressure sensitivity of 9.69 nm/GPa, which is the highest sensitivity ever reported. The designed microspheres with polychromatic emissions and high-pressure sensitivity are suitable for visual optical pressure sensing, and the applied strategy provides some important guidelines for the development of new optical manometers, allowing pressure monitoring with unprecedented accuracy.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2024
·Vol. 14
·期 9
·3929
·
IF 2.5
Rungang Liu,Xueting Liu,Weikai Lin,Yingliang Liu
Preparing submicron and nanoscale phosphors with good optical properties for practical applications is a challenging task for current inorganic long afterglow luminescent materials. This study utilized commercialized SrAl2O4:Eu2+, Dy3+phosphors (SAOED) as raw materials and employed solvents with lower polarity or non-polar solvents for dynamic solvothermal treatment. The commercialized phosphor’s overall average particle size was reduced from 42.3 μm to 23.6 μm while maintaining the fluorescence intensity at 91.39% of the original sample. Additionally, the study demonstrated the applicability of the dynamic solvothermal method to most other commercialized inorganic phosphors. The experiment produced a high-brightness nano-sized phosphor with a yield of 5.64%. The average diameter of the phosphor was 85 nm, with an average thickness of 16 nm. The quantum efficiency of the phosphor was 74.46% of the original sample. The fingerprint imaging results suggest that the nano-sized phosphors have potential for practical applications.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 6
·1901859
·
IF 8.286
Yi Wei,Zhiyu Gao,Siwei Liu,Shuoting Chen,Gongcheng Xing,Wei Wang,Peipei Dang,Abdulaziz A. Al Kheraif,Guogang Li,Jun Lin
Highly efficient green/yellowish-orange phosphors with low thermal quenching behavior are urgently required to improve the luminescence efficiency, color stability, and color rendering of phosphor-converted white light emitting diodes (w-LEDs). Herein, a novel green Cs 2 BaP 2 O 7 :0.01Eu 2+ phosphor with high luminescence efficiency (82.7%) and thermal quenching behavior (92.5% at 423 K) is reported. Besides, a further luminescence improvement in the quantum yield (98.9%) and thermal quenching resistance (120% at 448 K) is successfully achieved in green/yellowish-orange color-tunable Cs 2 MP 2 O 7 :0.01Eu 2+ (M = Ba, Sr, and Ca) phosphors. Surprisingly, these green/yellowish-orange Cs 2 MP 2 O 7 :0.01Eu 2+ (M = Ba, Sr, and Ca) phosphors even have a prior advantage over the commercial green β-SiAlON:Eu 2+ and yellow YAG:Ce 3+ phosphors. The corresponding spectral adjustment and thermal stability mechanisms are revealed, related to the optimization of local lattice symmetry. The prototype w-LEDs exhibit warm white light with CIE color coordinate at (0.337, 0.322). The color rendering index, corrected color temperature, and luminescence efficiency can reach 92.6, 4044 K, and 152.56 lm W −1 , respectively. In general, the as-reported green/yellowish-orange Eu 2+ -doped pyrophosphate phosphors are promising candidates in the future high-quality w-LEDs applications. The proposal of local lattice symmetry modulation can provide a new approach to exploit novel phosphors with excellent thermal quenching resistance.
研究领域:
材料科学
·
光学工程
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Haitao Lv,Zhidong Pan,Yanmin Wang
(Eu 2+ , Dy 3+ )-co-doped strontium aluminate (SrAl 2 O 4 :Eu 2+ , Dy 3+ ) powder as a mechanoluminescent (ML) phosphor was synthesized via soft mechanochemical pretreatment of precursor mixtures in a stirred media mill and subsequent calcination . Effect of soft mechanochemical pretreatment of precursors on the synthesis process as well as the photoluminescent (PL) and ML properties of SrAl 2 O 4 :Eu 2+ , Dy 3+ phosphor was investigated. The precursor mixtures unground and ground at different time and the resultant phosphors were characterized by laser particle size analysis , X-ray diffraction, scanning electron microscopy, differential scanning calorimetry , Fourier transform infrared spectroscopy and optical property measurement. The results reveal that soft mechanochemical pretreatment of precursor mixture promotes the crystal growth, and reduces the subsequent calcination temperature. SrAl 2 O 4 :Eu 2+ , Dy 3+ phosphor can be obtained via calcining at 1200 °C for precursor mixture ground at 60 min, but formed via calcining at 1400 °C for unground precursor mixture. The phosphor synthesized with precursor mixture ground at 60 min has the maximum PL and ML intensities due to the enhancement of Eu 2+ and Dy 3+ ions into the crystal lattice to form more electron traps . The measurements by a designed ML instrument indicate that the ML intensity increases with increasing impact stress, and decreases with multiple applications of the same impact stress on phosphor disks.
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
·
2023
·
IF 3.6
Reziwanguli Yantake,Aierken Sidike,Palidan Aierken,Taximaiti Yusufu
In the field of luminescent materials, the search for good substrates and the use of a single substrate to excite near-ultraviolet chips to produce white LED devices has always been of great interest. This study utilized energy transfer between Bi 3+ and Eu 3+ to design KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ red emission phosphors with a potassium nepheline structure, which were calcined in air with a high-temperature solid-state method. Under 286 nm excitation, energy transfer between Bi 3+ and Eu 3+ up to 85.9 %. Through DFT theoretical calculations, it was found that the bandgap of the matrix was 4.86 eV, KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ has excellent heat quenching resistance, and the emission intensity at 150 °C is 92.9 % of that seen at room temperature . Second, by doping with Eu 2 O 3 and calcining in a reducing atmosphere, KAlSiO 4 : 0.02Eu 2+ , 0.1Li + broadband blue emitting phosphors were obtained. Finally, KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ was mixed with KAlSiO 4 : 0.02Eu 2+ , 0.1Li + to prepare a near-ultraviolet white LED device. The color rendering index of the device reached 87.1, the color coordinates were (0.3328, 0.3015), and the color temperature was 5422 K. These results proved that KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ samples have potential for use in near-ultraviolet white LEDs and that KAlSiO 4 is a good substrate in the field of luminescence. This work provides a new breakthrough in the use of a single substrate to prepare multiple colored fluorescent powders and mix them together to produce white LED devices.
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 ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yuebo Li,Haina Qi,Yunrui Xie,Liu Yang,Wensheng Yu,Qianli Ma,Xiangting Dong,Dan Li,Guixia Liu,Jinxian Wang
CaF 2 :Eu 2+/3+ one-dimensional nanostructures including nanofibers , hollow nanofibers and nanobelts are respectively constructed via a newly-proposed technique of high-efficient combination of electrospinning with bi-crucible fluorinating technique. The diameters of CaF 2 :Eu 2+/3+ nanofibers and hollow nanofibers are respectively 328 ± 2 nm and 290 ± 5 nm, and the width and thickness of nanobelts are 1.07 ± 0.013 μm and 150 nm, respectively. Under the excitation of 276-nm or 320-nm ultraviolet light, CaF 2 :Eu 2+/3+ nanostructures exhibit characteristic emission peaks at 385 nm (purple) and 615 nm (red) assigned to 4f 6 5 d 1 (t 2g )→ 8 S 7/2 energy levels transition of Eu 2+ ions and 5 D 0 → 7 F 2 energy levels transitions of Eu 3+ ions, respectively. XPS data further confirm the coexistence and proportion of Eu 2+ and Eu 3+ in the samples. CaF 2 :9%Eu 2+/3+ nanofibers possess the highest luminescent intensity. White-emitting and color-tunable photoluminescence performance of CaF 2 :Eu 2+/3+ nanostructures are realized by regulating the proportion of Eu 2+ to Eu 3+ ions, and luminescence mechanism is also proposed. Further, it is satisfactorily found that the proportion of Eu 2+ to Eu 3+ ions can be modulated by adjusting the Eu-doped concentration and calcination temperature. The detailed formation mechanisms of CaF 2 :Eu 2+/3+ one-dimensional nanostructures are advanced, and the neoteric fabrication technique is successfully established. This design conception and construction strategy can provide some guidance for fabricating other one-dimensional nanostructures.
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
·
2019
·
IF 2.961
Zeqing Hu,Yanjie Zhang,Wenlu Liang,Muyao Wang,Jinghui Zhang,Jingjie Yu,Nianyu Zou
The photoluminescence properties and formation mechanism of oxygen vacancies in Ca 4 (PO 4 ) 2 O crystal were studied. X-ray diffraction, photoluminescence spectra, and Fourier transform-infrared spectra were used to investigate the formation process of Ca 4 (PO 4 ) 2 O crystal. Pure Ca 4 (PO 4 ) 2 O crystal prepared in reducing atmosphere shows an intense emission at 405 nm under excitation of 330 nm, which is originated from oxygen vacancies in the lattice. It can be concluded that oxygen vacancies in Ca 4 (PO 4 ) 2 O crystal exhibit a high thermal stability and the strong photoluminescence emission can be observed for the sample recalcined in air at 400 °C. The results of XRD and FTIR indicate a phase transformation process between Ca 4 (PO 4 ) 2 O, Ca 10 (PO 4 ) 6 O and Ca 10 (PO 4 ) 6 (OH) 2 phase and oxygen vacancies are also formed during this process. Furthermore, a novel Eu 2+ singly doped phosphate phosphor with multi-color emission can be firstly developed through strictly controlling phase transformation of the host. Under NUV excitation, the color coordinates are calculated to be (0.3427, 0.3229) and (0.3872, 0.3429) closely corresponding to white/warm white light. The warm white light with high color rendering index ( R a : 87.6) and low correlated color temperature (3510 K) can be achieved based on the Eu 2+ singly doped phosphate phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoyan Wang,Yu Yuan,Jingru Lai,Xiaoli Shi,Mingye Ding
Solar-driven water splitting for hydrogen production is a pivotal technique for sustainable energy conversion. However, its efficiency is constrained by intermittent solar irradiation and rapid charge recombination. To overcome these limitations, designing a round-the-clock photocatalyst with high charge storage capacity that can still operate effectively under low light flux after sunset and promote charge carrier separation is a promising strategy. Herein, by selecting SrAl 2 O 4 :Eu 2+ /Dy 3+ persistent phosphors as electron-trapped centers and g-C 3 N 4 semiconductor as visible-light photocatalyst, SrAl 2 O 4 :Eu 2+ /Dy 3+ @g-C 3 N 4 composite has been successfully synthesized via in-situ growth strategy to form a conventional type II heterojunction photocatalyst. Benefiting from the excellent ability of charge storage and release from electron traps and the improved electron-hole separation efficiency, the designed round-the-clock photocatalyst exhibits the improved hydrogen production from 153.8 μmol g −1 h −1 to 560 μmol g −1 h −1 under visible-light irradiation, infrared-light-driven H 2 production of 932 μmol g −1 for 3 h and a dark activity of 269.1 μmol g −1 h −1 lasing for 0.5 h. This work provides a promising strategy for designing a highly efficient photocatalyst for wide-spectral-responsive and all-weather photocatalytic hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）