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T. T. TRANG1, P. X. LE2, H. Y. LEE3, N. D. Q. ANH4,*
- Faculty of Engineering and Technology, Van Hien University, Ho Chi Minh city, Vietnam
- National Key Labrolatory of Digital Control and System Engineering, Ho Chi Minh city, Vietnam
- Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan
- Power System Optimization Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
The applications of white light-emitting diodes (WLEDs) have increasingly been popular in today's society, yet color inhomogeneity and poor luminous flux are restricting their development. In this paper, a structure of double-layer phosphor package of white LED is proposed to improve color uniformity and luminous flux, in which the green phosphor layer SrBaSiO4:Eu2+ was placed above the yellow phosphor layer YAG:Ce3+. The SrBaSiO4:Eu2+ concentration added must be modified until the highest luminous flux and chromatic homogeneity are achieved. Five similar WLEDs with different color temperatures ranging from 5600 K - 8500 K were used in this study. The results show that the greater the SrBaSiO4:Eu2+ concentration, the higher the luminous flux due to the increased green light component in WLEDs. However, a slight decrease in color rendering index and color quality index occurred when the SrBaSiO4:Eu2+ concentration increased excessively, according to the simulations and Monte Carlo calculations. This paper is a vital reference to the fabrication of WLEDs with higher illumination efficiency and color uniformity of the phosphor structures..
Double-layer phosphor, WLEDs, Monte Carlo theory, Color homogeneity, Luminous flux.
Submitted at: Sept. 7, 2018
Accepted at: June 14, 2019
T. T. TRANG, P. X. LE, H. Y. LEE, N. D. Q. ANH, Enhancing color homogeneity and luminous flux of WLEDs with double-layer phosphor configuration, Journal of Optoelectronics and Advanced Materials Vol. 21, Iss. 5-6, pp. 320-326 (2019)
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