Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

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

36 Scopus Citations
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Author(s)

  • Yu-Hsuan Hsiao
  • Cheng-Ying Chen
  • Li-Chuan Huang
  • Guan-Jhong Lin
  • Der-Hsien Lien
  • Jian-Jang Huang

Detail(s)

Original languageEnglish
Pages (from-to)2624-2628
Journal / PublicationNanoscale
Volume6
Issue number5
Online published26 Nov 2013
Publication statusPublished - 7 Mar 2014
Externally publishedYes

Abstract

Syringe-like ZnO nanorods (NRs) were fabricated on InGaN/GaN light emitting diodes (LEDs) by a hydrothermal method. Without sacrificing the electrical performances of LEDs, syringe-like NRs can enhance light extraction capability by 10.5% at 20 mA and shape the radiation profile with a view angle collimated from 136° to 121°. By performing optical experiments and simulation, it is found that the superior light extraction efficiency with a more collimated radiation pattern is attributed to the waveguiding effect of NRs and the mitigation of abrupt index change by the tapered ends of syringe-like ZnO NRs. This work demonstrates the importance of the nanostructure morphology in LED performances and provides the architecture design guidelines of nanostructures to a variety of optical devices.

Citation Format(s)

Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips. / Hsiao, Yu-Hsuan; Chen, Cheng-Ying; Huang, Li-Chuan; Lin, Guan-Jhong; Lien, Der-Hsien; Huang, Jian-Jang; He, Jr-Hau.

In: Nanoscale, Vol. 6, No. 5, 07.03.2014, p. 2624-2628.

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