Vertically-stacked LEDs with invariance of color Chromaticity

Hui, K. N. and Hui, K. S. (2011) Vertically-stacked LEDs with invariance of color Chromaticity. Current Applied Physics, 11 (3). pp. 662-666. ISSN 1567-1739

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Abstract

This study investigated the variance of color chromaticity of a vertically-stacked LEDs device with respect to the viewing angles. The LED chips with truncated inverted pyramid geometry were fabricated by laser micromachining. The sidewalls of the truncated inverted pyramid LED chips were coated with a thin layer of highly reflective silver film. The red, green and blue truncated inverted pyramid LED chips were vertically-stacked to form the white LEDs with color tunable function. A well mix of colors from the polychromatic LED chips was achieved in the layout of the vertically-stacked LEDs without utilizing additional optics. Compared to the commercial RGB LEDs, the stacked LEDs device showed insignificant angular dependence of color chromaticity. A luminous efficacy of 33 lm/W was achieved without any optimization of the fabrication process.

Item Type: Article
Uncontrolled Keywords: laser micromachining,rgb leds,vertically-stacked,white light emission
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: Pure Connector
Date Deposited: 30 Sep 2016 16:00
Last Modified: 22 Apr 2020 01:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/60647
DOI: 10.1016/j.cap.2010.11.006

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