Abstract：White powder light emitting diodes (LED) with different color temperature were made by using different ratio of yellow to orange silicate phosphor. When the ratio of yellow to orange phosphor was less than 7, the peak wavelength of yellow light in spectra was about 570 nm and the wavelength was about 590 nm as the ratio was greater than 7. With the color temperature increasing, the color rendering index and the luminous efficiency increased at the beginning and then decreased. And color temperature of 5 521 K is the optimal value. The reason was the ineffective excitation of blue light due to higher concentration of phosphor and excess red light in spectra. In contrast, blue light was not excited effectively and red light in spectra was little when the color temperature was higher than 5 521 K. The luminous efficiency was decreased, and the decreased magnitude was inconsistency with the testing temperature from 10 to 80 ℃. This suggests that, besides Auger recombination, the decrease in excitation efficiency of yellow and orange phosphors is different as the temperature rises and orange phosphor’s temperature characteristic is superior to that of yellow phosphor.
郭伟玲，崔德胜，崔碧峰，闫薇薇，刘 莹. 荧光粉比例对白光LED特性的影响[J]. 光谱学与光谱分析, 2011, 31(10): 2680-2683.
GUO Wei-ling, CUI De-sheng, CUI Bi-feng, YAN Wei-wei, LIU Ying . The Property of White Powder LED with Different Ratio of Phosphor . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(10): 2680-2683.
[1] Daniel A Steigerwald, Jerome C Bhat, Dave Collins, et al. IEEE Journal on Selected Topics in Quantum Electronics, 2002, 8(2): 310. [2] Naichia Yeh, Jen-Ping Chung. Renewable and Sustainable Energy Reviews, 2009, 13(8): 2175. [3] Pal N, Sadhu P K, Gupta R P, et al. International Conference on Computer and Automation Engineering, 2010, 5: 675. [4] Isamu Niki, Yukio Narukawa, Daisuke Morita, et al. Proceedings of SPIE-The International Society for Optical Engineering, 2004, 5187: 1. [5] Guo C, Luan L, Ding X, et al. Applied Physics B: Lasers and Optics, 2009, 95(4): 779. [6] WANG Hong-zhi(王宏志). Materials Review(材料导报), 2010, 24(7): 1. [7] CHEN Du, CHEN Chao(陈 都, 陈 朝). Journal of Xiamen University·Natural Science(厦门大学学报·自然科学版), 2007, 46(5): 669. [8] Joung Kyu Park, Chang Hae Kim, Seung Hyok Park, et al. Appl. Phys. Lett., 2004, 84(10): 1647. [9] Pardha Saradhi M, Varadaraju U V. Chem. Mater, 2006, 18: 5267. [10] LI Pan-lai, YANG Zhi-ping, WANG Zhi-jun, et al(李盼来, 杨志平, 王志军, 等). Chemical Journal of Chinese Universities(高等学校化学学报), 2008, 29(3): 457. [11] SUN Xiao-yuan, ZHANG Jia-hua, ZHANG Xia, et al(孙晓园, 张家骅, 张 霞, 等). Chinese Journal of Luminescence(发光学报), 2005, 26(3): 404. [12] Schubert E F. Light-Emitting Diodes. Cambridge University Press, 2006. [13] Harumasa Yoshida, Masakazu Kuwabara, Yoji Yamashita, et al. Appl. Phys. Lett., 2010, 96(21): 211122.
