Azimuthal anisotropy of light extraction from photonic crystal light-emitting diodes

Chun Feng Lai, Hao-Chung Kuo, C. H. Chao, H. T. Hsueh, J. F T Wang, W. Y. Yeh, J. Y. Chi, Tien-chang Lu, S. C. Wang

Research output: Contribution to journalConference articlepeer-review


Photonic crystal (PhC) light-emitting diodes (LEDs) exhibiting anisotropic light extraction have been investigated experimentally and theoretically. It is found that the anisotropic light extraction strongly depends on the lattice constant and orientation. Optical images of the anisotropy in the azimuthal direction are obtained using annular structure with triangular lattice. 6-fold symmetric light extraction patterns with varying number of petals are observed. More petals in multiple of 6 appear in the observed image with lattice constant increasing. This anisotropic behavior suggests a new means to optimize the PhC design of GaN LED for light extraction.

Original languageEnglish
Pages (from-to)2099-2101
Number of pages3
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number6
StatePublished - 13 May 2008
Event7th International Conference of Nitride Semiconductors, ICNS-7 - Las Vegas, NV, United States
Duration: 16 Sep 200721 Sep 2007


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