Efficiency improvement of the light-emitting diodes by the lateral overgrowth GaN on an AlN nanorod template

Wen Yi Lan, Yu Feng Yin, Chen Hung Tsai, Mu Xin Ma, Hsiang Wei Li, Wei Chi Lai, Jianjang Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

With the rapid development of GaN light-emitting diodes (LEDs), LEDs have been utilized in various ways. However, the quality of the GaN epi-structure has been a popular topic. In order to achieve higher internal quantum efficiency (IQE), LEDs have to be made with few defects during the epitaxy growth. Here we propose an AlN nanorod template grown on the sapphire substrate by vapor-liquid-solid (VLS) method. The voids near the AlN nanorods indicate a modification of dislocation with a lateral overgrowth. A strain relaxation and a better IQE in the epi-layer are observed in the Raman spectroscopy and temperature-dependent photoluminescence (PL). As a result, the IQE of the device with the proposed AlN nanorod template is increased 12.2% as compared with the reference sample without AlN nanorods.

Original languageEnglish
Title of host publicationFourteenth International Conference on Solid State Lighting and LED-Based Illumination Systems
EditorsNikolaus Dietz, Jian-Jang Huang, Matthew H. Kane, Jianzhong Jiao
PublisherSPIE
ISBN (Electronic)9781628417371
DOIs
Publication statusPublished - 2015
Event14th International Conference on Solid State Lighting and LED-Based Illumination Systems - San Diego, United States
Duration: 2015 Aug 122015 Aug 13

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9571
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

Other14th International Conference on Solid State Lighting and LED-Based Illumination Systems
CountryUnited States
CitySan Diego
Period15-08-1215-08-13

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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