Enhanced light output of angled sidewall light-emitting diodes with reflective silver films
- Title
- Enhanced light output of angled sidewall light-emitting diodes with reflective silver films
- Author
- Kwan-San Hui
- Keywords
- Light-emitting diodes; Gallium nitride; Inclined sidewalls; High light extraction efficiency
- Issue Date
- 2011-07
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- In Thin Solid Films, 2011, 519(8), P.2504-2507
- Abstract
- A proof-of-concept of applying laser micro-machining to fabricate high performance GaN light-emitting diode (LED) was presented in this study. Laser micro-machining was applied to fabricate GaN LED chip with angled sidewalls (ALED). The inclined sapphire sidewalls were coated with highly reflective silver film which functions as an efficient light out-coupling medium for photons within the LED structure. Thus, more laterally-propagating photons can be redirected to the upward direction of the ALED with silver coating (Ag-ALED). Performances of the Ag-ALED. ALED and conventional planar GaN LED were evaluated. At an injection current of 30 mA, the light output intensity of Ag-ALED was significantly improved by 97% and 195% as compared to ALED and conventional planar LED, respectively. The corresponding wall-plug efficiency of Ag-ALED was remarkably increased by 95% and 193% as compared to ALED and conventional planar LED, respectively. The results of this study demonstrated that the Ag-ALED showed a pronounced increase in light output intensity compared to conventional planar LED, which may have many potential applications in the field of display engineering. (C) 2010 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0040609010016068?via%3Dihubhttp://hdl.handle.net/20.500.11754/53053
- ISSN
- 0040-6090
- DOI
- 10.1016/j.tsf.2010.12.007
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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