Journal
IEEE ELECTRON DEVICE LETTERS
Volume 33, Issue 6, Pages 857-859Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2012.2192092
Keywords
Conical arrays; homoepitaxial light-emitting diode (LED); vertical-stand-type package; polystyrene (PS)
Categories
Funding
- National Natural Sciences Foundation of China [60806001]
- National High Technology Program of China [2011AA03A103]
- National Basic Research Program of China [2011CB301904]
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We demonstrated the fabrication and study of vertical-stand-type homoepitaxial light-emitting diodes (VLEDs) on a GaN substrate with conical array structures. The conical arrays were formed on the N-face surface of the GaN substrate using a size-controllable polystyrene nanosphere as etch mask. The 20-mA output power of the VLEDs with flat backside, truncated cone, and cone arrays improved by magnitudes of 16.5%, 66.8%, and 118.5%, respectively, compared with that of conventional planar configuration LEDs. These improvements could be attributed to the increased direct illumination surface and reduction in photon extraction path length. Moreover, small wavelength redshift proved that the VLED on the GaN substrate did not suffer from serious thermal effect.
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