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| Preparation of ZnO∶Zn Green Phosphors via Sintering Temperatures with Solid State Reaction and Their Application in Near-UV LEDs |
| ZHANG Na1,2, ZHUO Ning-ze1,2,3*, CHENG Shao-wen4, ZHU Yue-hua1,2, WANG Hai-bo2* |
1. Research Institute of Electric Light Source Material Science of Light Industry, Nanjing 210015, China
2. Research Institute of Electric Light Source Materials, Nanjing Tech University, Nanjing 210015, China
3. School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
4. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211800, China |
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Abstract In this paper, Zinc oxide phosphors (ZnO∶Zn) were prepared at a variety of sintering temperatures with solid state reaction. In addition, the annealing was done at 900～1 000 ℃ for 3 h. The characterization of the samples was done by different techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) spectra and visible spectrum analysis system, respectively. The results indicate that all samples are in agreement with the hexagonal wurtzite structure of the ZnO phase. The phosphors can be effectively excited by near-UV and emit the broad green emission band with the peak located at 502 nm which was attributed to oxygen vacancies. Samples sintered at 940 ℃ exhibit the brightest. In addition, the green and white LED devices were fabricated with the green and RGB phosphors, respectively. The results indicate that the green LED show stable spectral emission under different driving currents (250～500 mA), the emission spectra and color coordinates are basically unchanged, and the emission intensity increases with the increasing of current, the packaged white LED with the CCT 3 212 K, Ra94.1 and luminous efficiency reach 85.6 lm·W-1(@300 mA，9.3 V)which also show stable spectral emission under different driving currents (250～500 mA). The ZnO∶Zn green phosphor prepared in this paper has potential application value in the preparation of high color rendering and high quality white light LED.
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Received: 2017-10-09
Accepted: 2018-03-15
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Corresponding Authors:
ZHUO Ning-ze, WANG Hai-bo
E-mail: zhuoningze89@163.com；onedeskdgy@163.com
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