Light Output Enhancement of AlGaInP Light Emitting Diodes with Nanopores of Anodic Alumina

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概要

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• 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 40 min, 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.

• 2009-08-25

著者

• Houng Mau-phon

  Institute Of Microelectronics Department Of Electrical Engineering National Cheng Kung University

• Hung Chen-i

  Department Of Mechanical Engineering National Cheng-kung University

• Wang Chien-Chun

  Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan City 701, Taiwan, R.O.C.

• Lin Shi-Xiong

  Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan, R.O.C.

• Lin Shi-Xiong

  Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan City 701, Taiwan, R.O.C.

• Chong Kwok-Keung

  Department of Microelectronics Engineering, National Kaohsiung Marine University, Kaoshiung City 811, Taiwan, R.O.C.

• Chong Kwok-Keung

  Department of Microelectronic Engineering, National Kaoshiung Marine University, 142 Hai-Chuan Road, Nan-Tzu, Kaohsiung 811, Taiwan

• Liu Chien-Chih

  Department of Electrical Engineering, Nan Jeon Institute of Technology, Tainan County 737, Taiwan, R.O.C.

• Houng Mau-Phon

  Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan City 701, Taiwan, R.O.C.

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