UV, blue, green, yellow-green and white LEDs fabricated by III-N semiconductors

Y. K. Su, J. K. Sheu

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


Recent achievements in GaN-based light-emitting diodes (LEDs), which is linked to the use of new designs, such as p+-AlGaN/GaN strained-layer superlattice (SLS) and n+-InGaN/GaN short-period superlattice (SPS) top contact layer is reported. GaN-based LEDs with low-operation voltages, which are as low as 3 V (at 20 mA ) even lower, can be achieved by the use of these heavy-doped layers. In addition, conventional transparent conductive oxide, such as indium tin oxide (ITO), can be served as a transparent top contact layer in GaN-based LEDs other than thin metal film such as Ni/Au. Luminescence intensity in visible GaN-based LEDs can be significantly improved by this new design due to the high-transparency top contact layer. In the recent achievements, white LEDs including a variety of designs, such as phosphor-containing and phosphor-less device structures, will also be reported. Specifically, the high-efficiency yellow-green (λ∼565 nm) LEDs based on InGaN/GaN MQW emitting layers, which the luminescence intensity is comparable with the conventional AlGaInP yellow-green (λ∼575 nm) LEDs is achieved. This high-efficiency InGaN/GaN yellow-green LED makes a single-chip complementary white LED possible.

Original languageEnglish
Title of host publicationProceedings of the 6th Chinese Optoelectronics Symposium, COES 2003
EditorsK. T. Chan, H. S. Kwok
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780378873, 9780780378872
Publication statusPublished - 2003 Jan 1
Event6th Chinese Optoelectronics Symposium, COES 2003 - Hong Kong, China
Duration: 2003 Sep 122003 Sep 14

Publication series

NameProceedings of the 6th Chinese Optoelectronics Symposium, COES 2003


Other6th Chinese Optoelectronics Symposium, COES 2003
CityHong Kong

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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