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Scattering regulation using barium sulfate particles to achieve improved colour temperature uniformity of white LEDs

N. T. M. HANH1, N. L. THAI2, N. T. P. LOAN3,* , H. Y. LEE4

Affiliation

  1. Faculty of Mechanical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
  2. Faculty of Engineering and Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
  3. Faculty of Fundamental 2, Posts and Telecommunications Institute of Technology, Ho Chi Minh City, Vietnam
  4. Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan

Abstract

BaSO4 has showed up to be an ideal candidate for regulating the scattering performance in LEDs owing to its unique properties, thereby improving the LED’s efficiency and overall light quality. The high-reflectivity BaSO4 was utilized as the scattering factor in the yellow-phosphor conversion layer in this work. The concentration of BaSO4 was altered in the range of 5 wt% to 50 wt%. The scattering property of BaSO4 particles is investigated using Mie-scattering simulation coupled with LightTools software. The assessed lighting factors of LEDs on varying doping concentrations of BaSO4 in the phosphor layer include corelated color temperature (CCT) uniformity and luminosity. Simulation results exhibited that BaSO4 at high concentration was beneficial for CCT-deviation reduction to enhance the CCT distribution uniformity. Meanwhile, the luminosity declined as a trade-off for the induced scattering coefficients..

Keywords

LiLaO2:Eu3+, Dual-layer remote phosphor geometry, WLEDs, Mie-scattering theory, Colour rendering index.

Submitted at: April 14, 2024
Accepted at: Feb. 3, 2025

Citation

N. T. M. HANH, N. L. THAI, N. T. P. LOAN, H. Y. LEE, Scattering regulation using barium sulfate particles to achieve improved colour temperature uniformity of white LEDs, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 1-2, pp. 28-33 (2025)