Based on the solid-state reaction process, ZnO phosphors with different sintering temperatures were prepared, and wLED devices were prepared by combining near-ultraviolet LED chips. The photochromatic properties of the sample materials and devices were studied by X-ray diffraction, scanning electron microscopy, excitation and emission spectroscopy, spectrometer and other testing methods. The research results show that the spectral intensity of ZnO increases first and then decreases with the increase of sintering temperature and has an optimal value at 960° C; the corresponding excitation and emission spectral peaks are 380 nm and 501 nm，respectively. XRD and SEM show that the sample material has good crystallization properties.Under the condition of ZnO doping, the spectrum of the prepared wLED device is continuously improved. Under the condition of 4334 K the color rendering index reaches 95.7, an increase of 11.02%; the luminous flux and light extraction efficiency are 20.6 lm and 103 lm/W, respectively, decreased by 3.3%. This is because the emission spectrum distribution of ZnO deviates from the human visual efficiency curve, resulting in a slight decrease in the numerical value when calculating luminous flux.
[1] Wu W, Wang S, Zhong C, et al. Integral imaging with full parallax based on mini LED display unit[J]. IEEE Access,2019, 7: 32030-32036.
[2] Olle M, Viršile A. The effects of light-emitting diode lighting on greenhouse plant growth and quality[J]. Agricultural and Food Science, 2013, 22(2): 223-234.
[3] Schmitt M, Dietlin C, Lalevée J. Towards visible LED illumination: ZnO-ZnS nanocomposite particles[J]. Chemistry Select, 2020, 5(3): 985-987.
[4] Sun B, Zhang L, Huang G, et al. Fabrication, optical and luminescence properties of low pressure injection molded YAG: Ce tubular ceramics for outdoor lighting[J]. Journal of the European Ceramic Society, 2020, 41(2): 1564-1571.
[5] Chen M J, Loan N, Le V T, et al. The impacts of Ba2Li2Si2O7: Sn2+, Mn2+ and CaMgSi2O6:Eu2+, Mn2+ particles on the optical properties of remote phosphor LED[J]. Materials Science-Poland, 2020, 38(1): 1-7.
[6] 李嘉祥, 潘拴, 刘军林, 等. 低色温无荧光粉LED光源的可靠性研究[J]. 发光学报, 2020, 41(3): 323-330.
[7] Yamada K, Sugimoto M. Luminous efficacy theoretical calculation of white LED fabricated by RGB phosphor and ultra-Violet LED[C]//Proceedings of 2003 Annual Conference of the Illuminating Engineering Institute of Japan.Tokyo: The Illuminating Engineering Institute of Japan,2003: 131.
[8] 李盼来, 王振动, 罗志远, 等. 紫外-近紫外基白光LEDs用荧光粉的研究进展[J]. 人工晶体学报, 2015, 44(11):2954-2963.
[9] Li B, Liang J, Sun L, et al. Cyan-emitting Ba3Y2B6O15:Ce3+, Tb3+ phosphor: A potential color converter for nearUV-excited white LEDs[J]. Journal of Luminescence,2019, 211: 388-393.
[10] Zhao M, Liao H, Molokeev M S, et al. Emerging ultranarrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition[J]. Light: Science & Applications 2019, 8(38): 341-349.
[11] Philipp S, Tristan D B, Volker W, et al. Luminescence of an oxonitridoberyllate: A study of narrow-band cyanemitting Sr[Be6ON4]: Eu2+ [J]. Chemistry Of Materials.2018, 30: 3122-3130.
[12] Vanheusden K, Warren W L, Seager C H, et al. Mechanisms behind green photoluminescence in ZnO phosphor powders[J]. Journal of Applied Physics, 1996, 79(10):7983-7990.
[13] Rhouma F, Belkhiria F, Bouzaiene E, et al. The structure and photoluminescence of a ZnO phosphor synthe-sized by the sol gel method under praseodymium doping[J]. RSC Advances, 2019, 9(9): 5206-5217.
[14] 寿传忠, 郑慕周 . 氧化锌荧光粉合成的热力学计算[J].发光与显示, 1981, 2(3): 62-76.
[15] 郭娅, 曾珊珊, 郝文涛, 等 . LED 教室照明灯具对人眼生理特性的影响[J]. 照明工程学报, 2019(3): 7-14.
