Distinct U-shape efficiency-versus-current curves in AlGaN-based deep-ultraviolet light-emitting diodes
SCIE
SCOPUS
- Title
- Distinct U-shape efficiency-versus-current curves in AlGaN-based deep-ultraviolet light-emitting diodes
- Authors
- Park, JH; Lin, GB; Kim, DY; Lee, JW; Cho, J; Kim, J; Lee, J; Kim, YI; Park, Y; Schubert, EF; Kim, JK
- Date Issued
- 2015-06-15
- Publisher
- OPTICAL SOC AMER
- Abstract
- The efficiency of an AlGaN deep-ultraviolet light-emitting diode with peak emission wavelength of 285 nm is investigated as a function of current over a wide range of temperatures (110 K to 300 K). We find that the efficiency-versus-current curve exhibits unique and distinct features over the entire temperature range including three points of inflection. At low temperatures, the change in slope in the efficiency-versus-current curve is particularly pronounced producing a minimum in the efficiency after which the efficiency rises again. Furthermore, at high current density, the low-temperature efficiency exceeds the room-temperature efficiency. The feature-rich efficiency-versus-current curve is consistent with an enhancement in p-type conductivity by field-ionization of acceptors that occurs in the high-injection regime and is particularly pronounced at low temperatures. Differential conductivity measurements show a marked rise in the high-injection regime that is well correlated to the minimum point in the efficiency-versus-current curve. (C) 2015 Optical Society of America
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35573
- DOI
- 10.1364/OE.23.015398
- ISSN
- 1094-4087
- Article Type
- Article
- Citation
- OPTICS EXPRESS, vol. 23, no. 12, page. 15398 - 15404, 2015-06-15
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