We report the improved thermal stability of Ag reflectors for GaN-based light-emitting diodes (LEDs) using Ag nano-dots (∼65-∼190 nm in size). The nano-dot Ag samples show much higher reflectance than the Ag only samples. The annealed nano-dot Ag samples exhibit a smoother surface, where the grains contain numerous micro-twins. 〈111〉 texture becomes more dominantly evolved in the nano-dot Ag samples than in the Ag only samples after annealing. LEDs with the 300 °C-annealed nano-dot Ag reflectors exhibit 15-36 higher output power (at 20 mA) than LEDs with the 300 and 400 °C-annealed Ag only reflectors.
Bibliographical noteFunding Information:
This work was supported by the World Class University program through the National Research Foundation of Korea funded by the Ministry of Education, Science, and Technology (R33-2008-000-10025-0) and the Industrial Technology Development Program funded by the Ministry of Knowledge Economy (MKE), Korea.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)