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Enhancement of the color quality scale of white LEDs using red emitting Sr w F x B y O z :Eu 2+2+,Sm 2+ phosphor

N. D. Q. ANH1,* , P. X. LE2,* , H. Y. LEE3,*

Affiliation

  1. Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietna
  2. Faculty of Electrical and Electronics Engineering, HCMC University of Food Industry, Ho Chi Minh city, Vietnam
  3. Department of Electrical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung City, Taiwan

Abstract

In this paper, the red emitting Sr w F x B y O z :Eu 2+2+,Sm 2+ phosphor is proposed to enhance the color quality scale (CQS) of multi chip white LEDs (WLEDs) in two configurations, conformal phosphor and in cup phosphor. Because of the compensation of red light spectrum band, the CQS can be improved to a greater value than 76. Moreover, the effects of the Sr w F x B y O z :Eu 2+2+,Sm 2+ phosphor on the attenuation of lightare also verified based on the Lambert Beer law and Mie scatter ing theory. The obtained result is as a important instruction which can contribute to the fabrication of WLEDs with higher CQS..

Keywords

White LEDs, Lambert Beer law, Mie scattering theory, C olor qualit y scale, L uminous efficacy.

Citation

N. D. Q. ANH, P. X. LE, H. Y. LEE, Enhancement of the color quality scale of white LEDs using red emitting Sr w F x B y O z :Eu 2+2+,Sm 2+ phosphor, Optoelectronics and Advanced Materials - Rapid Communications, 12, 1-2, January-February 2018, pp.25-29 (2018).

Submitted at: Sept. 21, 2017

Accepted at: Feb. 12, 2018