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Determining the suitable SEPs of CaCO3 and TiO2 for specific optical enhancements of phosphor-converted LEDs

P. T. THAT1, P. X. LE2,* , L. V. THO3, H. Y. LEE4

Affiliation

  1. Faculty of Electronics Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh city, Vietnam
  2. Faculty of Mechanical - Electrical and Computer Engineering, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, Vietnam
  3. Institute of Tropical Biology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam
  4. Department of Electrical Engineering, National Kaohsiung University of Sciences and Technology, Kaohsiung, Taiwan

Abstract

The development method of pc-LED, a phosphor-converted light emitting diode, with scattering enhancement particles (SEPs) at 8500 K correlated color temperature is analyzed in this article. The pc-LED is an innovative lighting solution that has been used in several different categories, thus this article offers the approach to improve the color homogeneity and luminous flux of the pc-LEDs in order to fulfill the requirements of current lighting. Also, the extensive studies on the two SEPs, calcium carbonate (CaCO3) and titania (TiO2), are demonstrated in the article. In order to examine their properties and effects on the illumination of pc-LEDs, the tests involve combining both of these SEPs with a yellow phosphor Y3Al5O12:Ce3+. The analysis of SEPs includes the dispersion coefficients, the anisotropic dispersion, the diminished dispersion, and the dispersion amplitudes at 450 nm and 550 nm. The LightTools program is used to construct the pc-LED simulation, and the Mie-scattering theory can then validate the effects of the optical simulation. The research findings conclude that TiO2 particles are appropriate for color homogeneity and CCT-deviation reduction, while CaCO3 particles are successful in limiting significant decrease in lumen efficiency and the color deviation at the corresponding color temperature.

Keywords

White LED, Lambert-Beer law, CCT deviation, Luminous efficacy.

Citation

P. T. THAT, P. X. LE, L. V. THO, H. Y. LEE, Determining the suitable SEPs of CaCO3 and TiO2 for specific optical enhancements of phosphor-converted LEDs, Optoelectronics and Advanced Materials - Rapid Communications, 16, 1-2, January-February 2022, pp.68-73 (2022).

Submitted at: May 24, 2021

Accepted at: Feb. 10, 2022