Design of vertically-stacked polychromatic light-emitting diodes

K N Hui; X H Wang; Z L Li; P T Lai; H W Choi

doi:10.1364/oe.17.009873

Design of vertically-stacked polychromatic light-emitting diodes

Opt Express. 2009 Jun 8;17(12):9873-8. doi: 10.1364/oe.17.009873.

Authors

K N Hui¹, X H Wang, Z L Li, P T Lai, H W Choi

Affiliation

¹ Department of Electrical and Electronic Engineering, Semiconductor Display and Lighting Laboratory, The University of Hong Kong, Hong Kong.

PMID: 19506637
DOI: 10.1364/oe.17.009873

Abstract

A new design for a polychromatic light-emitting diode (LED) is proposed and demonstrated. LED chips of the primary colors are physically stacked on top of each other. Light emitted from each layer of the stack passes through each other, and thus is mixed naturally without additional optics. As a color-tunable device, a wide range of colors can be generated, making it suitable for display purposes. As a phosphor-free white light LED, luminous efficacy of 30 lm/watt was achieved.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Color*
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Lighting / instrumentation*
Optical Devices*
Reproducibility of Results
Semiconductors*
Sensitivity and Specificity