npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 698-704

Published online August 31, 2020

Copyright © New Physics: Sae Mulli.

Study on the Improvement of the Color Rendering Index of White LEDs by Using red Quantum dots

Seung Chan HONG1, Juheon BAEK1, Heonguk LEE1, Gi Jung LEE1, Jung-Gyun LEE1, Jae-Hyeon KO*1, Young Wook KO2, Yongduk KIM3, Taehee PARK3

1School of Nano Convergence Technology, Nano Convergence Technology Center, Hallym University, Gangwon 24252, Korea

2GLVISION Co, Ltd., Gangwon 24062, Korea
3Cheorwon Plasma Research Institute, Gangwon 24062, Korea


Received: May 14, 2020; Revised: May 23, 2020; Accepted: May 23, 2020


Red quantum-dot (QD) walls and films were applied to conventional 6-inch white LED (light-emitting diode) lightings, consisting of blue LED chips and yellow phosphors, to improve the color rendering index (CRI). The emission spectra, the CRI, the illuminance, and the luminance properties of six different configurations were investigated. The vertical QD wall surrounding the LED chips and defining the emission area played an important role in improving the R9 CRI for strong, saturated red while the QD film laminated on either the bottom or the top surface of the diffuser plate formed a vertical cavity, enhanced the color conversion efficiency, and increased the average CRI Ra and Re. This study clearly suggests that appropriate QD configuration can be used to increase the CRI of conventional white LED lightings at nearly no expense to the luminous efficiency.

Keywords: Illumination, Quantum dot, White LED, Color rendering index

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