Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals

Fabricating photonic crystals (PhCs) on GaN based non-polar light emitting diodes (LEDs) is an effective way to increase light extraction and meanwhile to preserve or improve polarization ratio. In this work, a-plane GaN LEDs with two-dimensional PhCs were demonstrated. With the E // m polarized mod...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (19)
Main Authors: Chou, Yen, Li, Hsiang-Wei, Yin, Yu-Feng, Wang, Yu-Ting, Lin, Yen-Chen, Lin, Da-Wei, Wu, Yuh-Renn, Kuo, Hao-Chung, Huang, Jian Jang
Format: Article
Language:English
Subjects:
Applied physics
ASYMMETRY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
DIFFRACTION
ELECTRIC FIELDS
ELECTRONIC STRUCTURE
GALLIUM NITRIDES
LIGHT EMITTING DIODES
Optical polarization
Organic light emitting diodes
Photonic band gaps
Photonic crystals
PHOTONS
POLARIZATION
Vertical polarization
VISIBLE RADIATION
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Summary:Fabricating photonic crystals (PhCs) on GaN based non-polar light emitting diodes (LEDs) is an effective way to increase light extraction and meanwhile to preserve or improve polarization ratio. In this work, a-plane GaN LEDs with two-dimensional PhCs were demonstrated. With the E // m polarized modes (which mean the optical polarization with the electric field parallel to m-axis) as the target of diffraction, we matched E//m modes to the photonic bands and aligned E//c modes to fall within the photonic band gap. The results show stronger E//m but weaker E//c mode diffractions on both c- and m-axes. At the vertical direction, the polarization ratio is enhanced from 45.8% for the planar device to 52.3% for the LEDs with PhCs.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4876655