Enhancement of LED light-extraction efficiency by anodic oxidation

Chien Chun Wang, Wei Lun Lu, Te Chi Yen, Chien Chih Liu, Chang Hsin Chu, Yeong Her Wang, Mau Phon Houng

Research output: Contribution to journalConference articlepeer-review


In this work, the enhancement of light-extraction efficiency for AlInGaP-based light-emitting diodes (LEDs) by using porous alumina is proposed. The employment of the porous alumina increases the total power by 6.35%, while the optical spectrum is unchanged. By nano-texturing the thin-film surface, it is much easier for light to escape from porous alumina light-emitting diodes (PA-LEDs). The pore distances about 25-80 nm under anodized voltage ranges of 10-30 V in the sulfuric acid. Besides, nanopores of porous alumina also can be enlarged (∼0.8nm/per min) in the phosphoric acid. The diameter of the nanopores (20-60nm) and the interpore distance (25-80nm) can be modulated by anodic parameters. copyright The Electrochemical Society.

Original languageEnglish
Pages (from-to)217-221
Number of pages5
JournalECS Transactions
Issue number5
Publication statusPublished - 2006 Dec 1
EventState-of-the-Art Program on Compound Semiconductors XLIV 209th Electrochemical Society Meeting - Denver, CO, United States
Duration: 2006 May 72006 May 12

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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