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https://doi.org/10.1088/0957-4484/19/40/405303
Title: | Fabrication of a nano-cone array on a p-GaN surface for enhanced light extraction efficiency from GaN-based tunable wavelength LEDs | Authors: | Soh, C.B. Wang, B. Chua, S.J. Lin, V.K.X. Tan, R.J.N. Tripathy, S. |
Issue Date: | 1-Oct-2008 | Citation: | Soh, C.B., Wang, B., Chua, S.J., Lin, V.K.X., Tan, R.J.N., Tripathy, S. (2008-10-01). Fabrication of a nano-cone array on a p-GaN surface for enhanced light extraction efficiency from GaN-based tunable wavelength LEDs. Nanotechnology 19 (40) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0957-4484/19/40/405303 | Abstract: | We report on the fabrication of a nano-cone structured p-GaN surface for enhanced light extraction from tunable wavelength light emitting diodes (LEDs). Prior to p-contact metallization, self-assembled colloidal particles are deposited and used as a mask for plasma etching to create nano-cone structures on the p-GaN layer of LEDs. A well-defined periodic nano-cone array, with an average cone diameter of 300 nm and height of 150 nm, is generated on the p-GaN surface. The photoluminescence emission intensity recorded from the regions with the nano-cone array is increased by two times as compared to LEDs without surface patterning. The light output power from the LEDs with surface nano-cones shows significantly higher electroluminescence intensity at an injection current of 70 mA. This is due to the internal multiple scattering of light from the nano-cone sidewalls. Furthermore, we have shown that with an incorporation of InGaN nanostructures in the quantum well, the wavelength of these surface-patterned LEDs can be tuned from 517 to 488 nm with an increase in the injection current. This methodology may serve as a practical approach to increase the light extraction efficiency from wavelength tunable LEDs. © IOP Publishing Ltd. | Source Title: | Nanotechnology | URI: | http://scholarbank.nus.edu.sg/handle/10635/55984 | ISSN: | 09574484 | DOI: | 10.1088/0957-4484/19/40/405303 |
Appears in Collections: | Staff Publications |
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