Enhanced Extraction and efficiency of blue GaN based LEDs with embedded micro air voids and SiO 2 nanomask

Ching Hsueh Chiu, Chien-Chung Lin, Hao Wei Han, Da Wei Lin, Yan Hao Chen, Hao-Chung Kuo, Tien-chang Lu, Shing Chung Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this work, the high performance GaN-based light emitting diodes (LEDs) with embedded micro air voids and SiO 2 nanomask by metal-organic chemical vapor deposition (MOCVD). Micro-scale air voids and SiO 2 nanomask were clearly observed at the interface between GaN nano-rods (NRs) and the overgrown GaN layer by scanning electron microscopy (SEM). It can increase the light extraction efficiency due to additional light scattering. The transmission electron microscopy (TEM) images show the threading dislocations were suppressed by nanoscale epitaxial lateral overgrowth (NELOG). We fabricated high efficiency LEDs with embedded micro-scale air voids and SiO 2 nanomask exhibit smaller reverse-bias current and great enhancement of the light output (65% at 20mA) compared with the conventional LEDs.

Original languageEnglish
Title of host publicationConference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2011
Pages942-943
Number of pages2
StatePublished - 1 Dec 2011
EventConference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2011 - Sydney, Australia
Duration: 28 Aug 20111 Sep 2011

Publication series

NameOptics InfoBase Conference Papers
ISSN (Electronic)2162-2701

Conference

ConferenceConference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2011
CountryAustralia
CitySydney
Period28/08/111/09/11

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