Enhanced light output of angled sidewall light-emitting diodes with reflective silver films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • K. N. Hui
  • K. S. Hui
  • Heesoo Lee
  • Dong-Hyun Hwang
  • Young-Guk Son

Detail(s)

Original languageEnglish
Pages (from-to)2504-2507
Journal / PublicationThin Solid Films
Volume519
Issue number8
Publication statusPublished - 1 Feb 2011

Abstract

A proof-of-concept of applying laser micro-machining to fabricate high performance GaN light-emitting diode (LED) was presented in this study. Laser micro-machining was applied to fabricate GaN LED chip with angled sidewalls (ALED). The inclined sapphire sidewalls were coated with highly reflective silver film which functions as an efficient light out-coupling medium for photons within the LED structure. Thus, more laterally-propagating photons can be redirected to the upward direction of the ALED with silver coating (Ag-ALED). Performances of the Ag-ALED, ALED and conventional planar GaN LED were evaluated. At an injection current of 30 mA, the light output intensity of Ag-ALED was significantly improved by 97% and 195% as compared to ALED and conventional planar LED, respectively. The corresponding wall-plug efficiency of Ag-ALED was remarkably increased by 95% and 193% as compared to ALED and conventional planar LED, respectively. The results of this study demonstrated that the Ag-ALED showed a pronounced increase in light output intensity compared to conventional planar LED, which may have many potential applications in the field of display engineering. © 2010 Elsevier B.V.All rights reserved.

Research Area(s)

  • Gallium nitride, High light extraction efficiency, Inclined sidewalls, Light-emitting diodes

Citation Format(s)

Enhanced light output of angled sidewall light-emitting diodes with reflective silver films. / Hui, K. N.; Hui, K. S.; Lee, Heesoo; Hwang, Dong-Hyun; Son, Young-Guk.

In: Thin Solid Films, Vol. 519, No. 8, 01.02.2011, p. 2504-2507.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review