W N Ng et al 2008 Nanotechnology 19 255302 doi:10.1088/0957-4484/19/25/255302
Photonic crystal light-emitting diodes fabricated by microsphere lithography
FREE ARTICLEW N Ng, C H Leung, P T Lai and H W Choi
Show affiliationsInstead of using conventional electron lithography, a two-dimensional photonic crystal consisting of a hexagonal array of triangular air-holes was created on the surface of a GaN LED substrate using microsphere lithography. The microspheres self-assemble into a single-layered hexagonal-close-packed array acting as an etch mask. A significant enhancement in photoluminescence intensity was recorded from the PhC LED structure. A twofold increase in electroluminescence was observed from the PhC LED compared to an as-grown LED with identical geometry. Besides geometrical factors due to surface roughening, the dispersive nature of PhCs and diffractive properties of the PhC as a grating contribute to the enhancement of light extraction from the LED.
- PACS
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85.60.Jb Light-emitting devices
42.70.Qs Photonic bandgap materials
85.60.Bt Optoelectronic device characterization, design, and modeling
- Subjects
- Dates
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Issue 25 (25 June 2008)
Received 25 February 2008, in final form 18 April 2008
Published 14 May 2008
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Photonic crystal light-emitting diodes fabricated by microsphere lithography
W N Ng et al 2008 Nanotechnology 19 255302
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