Date
Place
- Room C (Room 323)
- 3. LEDs and Lighting I
- August 19, 2015 (Wednesday)
- 09:00 ~ 10:30
- [3-2]
- 09:25 ~ 09:50
- Title:[Invited] Determination of Carrier Injection Efficiency and its Effects on the Efficiency Droop in GaN Light Emitting Diodes
- Nan-Cho Oh, Tae-Soo Kim, Tae-Gyun Eom, Seung-Young Lim (Kongju Nat'l Univ., Korea), Youngboo Moon (UJL Inc., Korea), and Jung-Hoon Song (Kongju Nat'l Univ., Korea)
Abstract: One of the crucial obstacles in the application of GaN-based LEDs for the high-powered lighting source is the efficiency droop, the gradual reduction of efficiency of GaN-based LEDs as the injected current increases. Despite of years of efforts, however, the origin of the efficiency droop is still not clear. The main reason for this prolonged debate is the lack of an experimental method to separate the radiative efficiency (RE) and carrier injection efficiency (CIE). In this work, we proposed and demonstrated a novel method to experimentally determine the RE and CIE, and investigated the effect of them on the efficiency droop. This is a direct method without rigorous data manipulation with minimum assumptions. We believe our proposed methodology can also provide an ultimate characterization tool for LEDs
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