JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8094-8099
·
IF 1.798
Cao Renping,Peng Dedong,Fu Ting,Luo Zhiyang,Zhou Shenlin,Jiang Shenhua,Fu Jingwei
KSrVO 4 :Eu 3+ phosphors are synthesized by solid-state reaction method in air. Host KSrVO 4 under excitation at 345 nm emits green–yellow light with the CIE chromaticity coordinates (0.3466, 0.4425), and its broad emission band peaking at ~545 nm covers the range 400–750 nm due to 3 T 1,2 → 1 A 1 transitions in [VO 4 ] 3− group. KSrVO 4 :Eu 3+ phosphor under excitation at 315 and 394 nm shows red emission with the CIE chromaticity coordinates (0.6279, 0.3717), and the emission spectra in the range of 560–750 nm contains four narrow emission bands owing to 5 D 0 → 7 F
J
( J = 1, 2, 3, and 4) transitions of Eu 3+ ion, respectively. The optimal Eu 3+ doping concentration is ~4 mol%. The lifetime decreases from 0.991 to 0.893 ms with increasing Eu 3+ concentration within the range 0.5–6 mol%. The possible luminous mechanism is analyzed by the simplified energy level diagrams of VO 4
3− group and Eu 3+ ion, and energy transfer process in KSrVO 4 :Eu 3+ phosphor. The experimental results indicate that KSrVO 4 :Eu 3+ phosphor will be possible to be used as red phosphor candidate for white light-emitting diode (LED) based on ultraviolet (~315 nm) and near ultraviolet (~395 nm) LED chips.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Xiao Gong,Wenwen Ma,Yunxia Li,Lingqi Zhong,Wenjing Li,Xiujian Zhao
Luminescent solar concentrators (LSCs) as alternatives to solar cells are suitable for photovoltaic windows. Generally semiconductor quantum dots are employed as emitters for LSC fabrication due to their advantages such as photostability, spectral tunability, and high photoluminescence quantum yield . In this paper, we used low cost and environmentally friendly N-doped carbon-dots (N-CDs) as phosphors to fabricate N-CDs/PMMA slab based luminescent solar concentrators. The high-performance N-CDs/PMMA slab based LSCs with an external optical efficiency of 12.23% could be achieved when the concentration of N-CDs within the PMMA matrix is 0.08 wt%. Our results showed that N-CDs/PMMA slab based luminescent solar concentrators make the practical use of LSCs more feasible because of the unique properties of N-CDs.
研究领域:
材料科学
·
可再生能源
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Xiaojiao Kang,Yanchun Yang,Lan Wang,Song Wei,Daocheng Pan
Cadmium-free and water-soluble AgInS2/ZnS core/shell quantum dots (QDs) with a cost of 2.5 $/g are synthesized in an electric pressure cooker. The QD powders with different Ag/In ratios exhibit bright yellow, orange, and orange-red luminescence under UV light. Their absolute photoluminescence quantum yields (PLQYs) can reach as high as 50.5, 57, and 52%, respectively. Because gelatin is used as the capping agent, the concentrated QDs/gelatin solution can be directly utilized as phosphor for the fabrication of white light-emitting diodes (LEDs) by a simple drop-drying process without the need of resin package. Warm-white LEDs are obtained by combining orange-emitting QDs with blue InGaN chip. As-fabricated warm-white LED exhibits a luminous efficacy of 39.85 lm/W, a correlated color temperature (CCT) of 2634 K and a color rendering index (CRI) of 71 at a drive current of 20 mA. Furthermore, the electroluminescence (EL) stability of LED device and thermal stability of as-prepared QDs are evaluated.
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
Advanced Optical Materials
·
2021
·Vol. 9
·期 21
·2101132
·
IF 9.926
Yongcheng He,Haohua Liang,Meihua Chen,Licheng Jiang,Zhishen Zhang,Xiaobo Heng,Lin Yang,Yanpeng Hao,Jiulin Gan,Zhongmin Yang
Soft actuators, an emerging field in robotics, have great potential for wide-ranging applications in biology, medicine, engineering, and oceanography. Photoactuators that are stimulated by light to produce reversible mechanical deformation have attracted significant interest in recent years owing to their advantages of high resolution, fast switching, flexible controllability, and electromagnetic interference immunity. Conventional photoactuators rely on free-space illumination, which limits the control in light-obstructed surroundings. A low loss optical fiber waveguide-based soft photoactuator composed of photothermally responsive material hinges and high-transparency elastomer fiber arms is proposed. When light travels in the elastomer fiber arms, the hinges exhibit a very large shape change so that the arms bend by themselves, with a maximum repeatable bending angle of approximately 145°. The angle is determined by the injected optical power. A fiber photoactuator with dual hinges is designed that is capable of reversible complex deformation. Moreover, in a narrow silicone tube, the fiber photoactuator can still be stimulated with considerable deformation by the light injected along the fiber. A fiber photoactuator-constructed microhook is demonstrated for grabbing object in water.
研究领域:
机器人学
·
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Minghui Zhou,Jun Sun,Bei Zhang,Youjie Hua,Feifei Huang,Hongping Ma,Renguang Ye,Shiqing Xu
Phosphor-in-ceramic (PiC) has garnered considerable attention in high-power white laser lighting owing to its advantages, such as high efficiency and good thermal stability. In this study, a transparent hydroxyapatite (HA) ceramic was successfully prepared via spark-plasma sintering (SPS) under relatively mild conditions. A series of ultra-high efficiency green-emitting PiCs were obtained by pure HA ceramics with 1–12% Lu 3 Al 5 O 12 : Ce (LuAG) phosphors. Owing to the rapid sintering of SPS and the stability of HA ceramics, HA ceramic matrix has high transparency, and does not damage the crystal structure of the LuAG phosphor. When excited by a blue laser, the HA-LuAG PiC exhibited an excellent luminous efficacy of 300.48 lm·W −1 . The fluorescence saturation threshold of the laser power was approximately 7.90 W. These results demonstrate that HA-LuAG PiCs have great potential for applications as efficient green-emitting phosphor conversion materials for high-power laser lighting.
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 Advanced Ceramics
·
2022
·Vol. 11
·期 12
·1889-1900
·
IF 11.534
Peng Yang,Yu Zikang,Zhao Jiuzhou,Wang Qing,Liu Jiaxin,Sun Bo,Mou Yun,Chen Mingxiang
Multi-color phosphor-in-glass (PiG) film has been considered as a promising color converter in high-quality laser lighting owing to its outstanding merits of phosphor versatility, tunable luminescence, and simple preparation. However, the opto-thermal properties of PiG film are severely affected by the photon reabsorption and backward scattering of phosphor structure and the heat conduction of substrate. Herein, a unique sandwich design of phosphor structure was introduced in the multi-color PiG film for high-quality laser lighting. By elaborately synthesizing the borosilicate glass with low glass transition temperature ( T g ), similar expansion coefficient, and high refractive index (RI), the sandwiched PiGs were prepared by sintering (~600 °C) broadband green and red phosphor glass films on the double sides of sapphire. The green and red PiG films were tightly coated on the sapphire with no delamination and maintained higher luminescence intensity than raw phosphors at high temperatures. By simultaneously coupling photon reabsorption and backward scattering, the sandwiched green PiG film—sapphire—red PiG film (G—S—R PiG) yields a high-quality white light with a high luminous efficacy of 163 lm/W and an excellent color rendering index (CRI) of 85.4 under a laser power of 2.4 W, which are the best comprehensive results yet reported. Benefiting from the ingenious sandwich design with heat-conducting sapphire and thin PiG films, the G—S—R PiG displays low working temperatures (< 200 °C) under high-power laser excitation. This work reveals the role of sandwiched phosphor structure in photon loss and heat dissipation, which provides a new strategy to design PiG films for high-quality laser lighting.
研究领域:
光学材料
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jinxing Zhao,You Zhang,Taian Wang,Li Guan,Guoyi Dong,Zhenyang Liu,Nian Fu,Fenghe Wang,Xu Li
Anti-counterfeiting technology is of great significance to information security. To obtain high-quality anti-counterfeiting materials, the developments of inorganic materials are crucial. In this paper, a series KGaSiO 4 : x Eu 3+ phosphors with persistent luminescence, photoluminescence , and thermochromic have been successfully prepared and the application of quadruple anti-counterfeiting is realized. The X-ray diffraction and Rietveld refinement indicate that the phosphors are pure phase. With Eu 3+ ions doping, the structure change, site occupancies, and color-tunable phenomenon are carefully investigated. Different from another Eu 3+ doping phosphor, the emission of KGaSiO 4 :0.2% Eu 3+ phosphor changes with the excitation light in the region of 240 nm–306 nm. The emission color can be modulated with the surrounding temperature. Surprisingly, this phosphor can emit green afterglow light, which is attributed to the different luminescent properties of the matrix and doping of Eu 3+ ions. The series of phosphors exhibit abundant luminescent properties. Based on their wavelength dependence, concentration quenching, long afterglow, and thermochromic properties, the KGaSiO 4 : x Eu 3+ phosphors can be effective materials for quadruple-modal anti-counterfeiting 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
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ding Zhou,Yi Wang,Pengfei Tian,Pengtao Jing,Maolei Sun,Xi Chen,Xiaowei Xu,Di Li,Shiliang Mei,Xiaoyan Liu,Wanlu Zhang,Ruiqian Guo,Songnan Qu,Hao Zhang
Solid-state highly photoluminescent quantum dot (QD)-based phosphors attract great scientific interests as color converters because of an increasing demand for white-light-emitting devices. Herein, a microwave-assisted heating method is presented to fabricate multicolor QD-based phosphors within 30 s through microwave-assisted heating of the mixture of QDs and sodium silicate aqueous solution. In the composites, the formed cross-linked networks not only play as a matrix to prevent QD aggregation in solid state but also cause the variation of the refractive index around QDs and the QD surface optimization, which contributes to good stabilities and twice enhancement in photoluminescence quantum yields (69%) compared with the initial QD aqueous solution (33%). Using the QD-based phosphors as color conversion layers, white-light-emitting diodes were realized with controllable color temperature, high color purity, and high color-rendering index (90.3), which show a great potential in display and illumination. Furthermore, the luminescence lifetime of the QD-based phosphors is less than 25 ns. The potential application of the QD-based phosphors in visible light communication was also demonstrated, with the modulation bandwidth achieving 42 MHz.
研究领域:
材料科学
·
光电子学
·
光子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qi Wang,Wei Jiang,Tian-Ci Liu,Hao-Ran Liu,Rui-Rui Hu,Wei-Xiao Sun,Fang-Ting Guo,Bing Hu,Xiao-Wu Lei
Zero-dimensional (0D) organic indium halides have been emerged as promising broadband light emitters with wide application prospects, but most of the present halides suffer from low photoluminescence quantum yield (PLQY), and a high-power excitation light source is needed to obtain desirable performance. In this work, we elaborately select appropriate organic cations as crystal structural engineering and obtained a series of highly efficient 0D indium bromides. Under UV light excitation, these 0D indium halides display broadband yellow light emissions (550–600 nm) with near-unity PLQYs, which represents one of the highest values in all the previously reported indium halides. Benefiting from successful nanoscale engineering, highly luminescent inks based on these 0D indium halides are facilely prepared by dispersing nanocrystals into various organic solvents. The luminescent ink can be utilized to print various anticounterfeiting patterns, which displays photoreversible switching with visible/invisible transformation under the alternating irradiation of UV and visible light. Furthermore, white light emitting diodes can be fabricated with high color rendering index above 90 by using these 0D halides as down-conversion phosphors. This work not only promotes the development of indium halides but also significantly broadens the application in solid-state illumination and anticounterfeiting, etc.
研究领域:
材料科学
·
光学工程
·
应用化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Wu Ning,Dai Fangxu,Wang Kunpeng,Wang Yunhu,Wang Xinyi,Zhang Kai,Zhang Mingming,Liu Kang,Xu Jixiang,Wang Lei,Xing Jun
White light-emitting diodes (WLEDs) as energy-saving light sources are widely used to alleviate the rising electric consumption. Most commercial WLEDs are blue/yellow-mixed emitting devices, which have some disadvantages, such as physiological damages of rich blue light, complex device structure and color aging. It is essential to develop single-component WLEDs with quasi-solar spectrum to overcome these problems. Here we demonstrate a high-performance single-component WLED based on donor-acceptor integrated carbon nitride (DACN) material. The donor-acceptor simultaneously increases the photoluminescence efficiency and the carrier mobility of graphitic carbon nitride (g-CN), hence, the DACN-based WLED reaches a milestone in maximum luminance of 2,045 cd m −2 and maximum external quantum efficiency of 2.2%, which are one order of magnitude higher than pristine g-CN-based LED. Furthermore, the DACN-based WLED emits broadband white light with color coordinates of (0.34, 0.44) and a color temperature of 5,163 K. Our works open a way to boost optoelectronic properties of g-CN materials and show their promising application in single-component WLEDs.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
DOI
高影响因子
Bioactive Materials
·
2021
·
IF 14.593
Meiqi Chang,Wei Feng,Li Ding,Hongguang Zhang,Caihong Dong,Yu Chen,Jianlin Shi
Tumor oxygenation level has been regarded as an attractive target to elevate the efficiency of photodynamic therapy (PDT). Cyanobacterial photosynthesis-mediated reversal of tumor hypoxia could enable an oxygen-boosted PDT, but is limited by scant penetration depth and efficiency of external light. Herein, aiming at the dual purposes of reducing biological toxicity induced by long-term light irradiation and alleviating hypoxia, we here introduce a novel-designed CaAl 2 O 4 :Eu,Nd blue persistent luminescence material (PLM) as the in vivo light source after pre-excited in vitro . The ingenious construction of blue-emitting PLM with “optical battery” characteristics activates cyanobacterial cells and verteporfin simultaneously, which performs the successive oxygen supply and singlet oxygen generation without the long-term external excitation, resulting in the modulated tumor hypoxic microenvironment and enhanced photodynamic tumor proliferation inhibition efficiency. Both in vitro cellular assessment and in vivo tumor evaluation results affirm the advantages of self-produced oxygen PDT system and evidence the notable antineoplastic outcome. This work develops an irradiation-free photosynthetic bacteria-based PDT platform for the optimization of both oxygen production capacity and light utilization efficiency in cancer treatment, which is expected to promote the clinical progress of microbial-based photonic therapy.
研究领域:
癌症治疗
·
生物光子学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Transactions of the Indian Ceramic Society
·
2020
·
IF 0.952
Shifa Wang,Huajing Gao,Hong Yu,Peiying Li,Yanwu Li,Chaoli Chen,Yong Wang,Liang Yang,Zijuan Yin
MgAl2O4:M (M = Ti, Mn, Co, Ni) phosphors were successfully prepared by a modified polyacrylamide gel method. Calcination temperature and metal particle has significant effects on the phase transition, optical and color properties of Mg Al2O4: M phosphors. Ti, M n, Co and Ni metal particles introduced into the MgAl2O4 system can produce a variety of colours from white, grayish black, blue to turquoise blue. Mn, Co and Ni metal particles added into MgAl2O4 system can extend their light absorption to visible light range, while the Ti metal particles clad into the system did not improve significantly. Co metal particles appended into the MgAl2O4 system can cause fluorescence quenching of emission peak at 395 nm and enhancement of emission peak at 405 nm, while the Ti and Mn metal particles infused into the system can bring the enhancement of visible emission peak at 425 nm. The fluorescence quenching of the peak at 395 nm can be ascribed to the wavelength of Co metal particles matching the surface plasmon absorbance band of MgAl2O4:M phosphor. A reduction in emission intensity at 425 nm can be assigned to electron transfer from the conduction band (CB) of MgAl2O4 to the CB of metal particles causing non-radiative decay.
研究领域:
材料科学
·
光学
·
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）