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Opt Express. 2009 Jun 8;17(12):9873-8.

Design of vertically-stacked polychromatic light-emitting diodes.

Author information

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

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.

PMID:
19506637
DOI:
10.1364/oe.17.009873
[Indexed for MEDLINE]

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