Light output enhancement of AlGaInP light emitting diodes with nanopores of anodic alumina

Chien Chih Liu, Shi Xiong Lin, Chien Chun Wang, Kwok Keung Chong, Chen I. Hung, Mau-phon Houng

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this paper, we describe the improvement in the light extraction efficiency of AlGaInP light-emitting diodes (LEDs) upon use of a porous anodic alumina (PAA) film and pore widening. Acting as an intervening layer between air and the GaP window layer, PAA increased the critical angle to reduce the internal light reflection of LEDs. The nanopores of the PAA film provided a rough surface that enhanced the light output extraction. These factors resulted in the LEDs with PAA films exhibiting a light output power 29% higher than that of a conventional LED (without PAA film). Furthermore, following a pore-widening treatment for 40min, the light output improvement increased to 39%. Therefore, the use of PAA film and a suitable pore-widening treatment increases the light extraction efficiency of LEDs.

Original languageEnglish
Pages (from-to)821021-821023
Number of pages3
JournalJapanese Journal of Applied Physics
Volume48
Issue number8 Part 1
DOIs
Publication statusPublished - 2009 Dec 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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