The Electrical and Thermal Effect of Electrode Layouts on Nitride-based High-Power Light Emitting Diodes

• Main Authors: Li Jen-Kai, 李仁凱
• Other Authors: Chiou Yu-Zung
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/86460659605815292707

碩士 === 南台科技大學 === 電子工程系 === 99 === In this research, the nine kinds of high-power light emitting diodes (LEDs) with different electrode layouts were proposed and fabricated. In the experiment, the electrode layouts has significant influence on the current spreading, forward voltage, light output power and junction temperature of nitride-based LEDs. We investigated the relationships between electrode layouts and photoelectric characteristics. The best better electrode layouts can not only enhance the current spreading ability and light output power but also reduce junction temperature. We measured the light output power and junction temperature. With 350 mA injection current, it was found that light output power of LED 5 and LED 8 were 200.111 mW and 201.1275 mW. The temperature of LED 5 and LED 8 were 165.43 ℃ and 169.62 ℃. On the other hand, the light output power of LED 4 is better than others. It should be attributed to the large mesa area. But electrode layout of LED 4 can result in current crowding and high junction temperature. According to the results, the better electrode layouts can enhance current spreading ability, light output power and reduce forward voltage and temperature. Besides, the worst electrode layouts can result in current crowding and high junction temperature.