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Fig. 5. External quantum efficiencies of LEDs grown on CSS, BPSS, HPSS,and CPSS.

Fig. 4. Far-field pattern of LEDs grown on CSS, BPSS, HPSS, and CPSS with an injection current of 400 mA. Fig. 5. External quantum efficiencies of LEDs grown on CSS, BPSS, HPSS,and CPSS. Conclusion.

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Fig. 5. External quantum efficiencies of LEDs grown on CSS, BPSS, HPSS,and CPSS.

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  1. Fig. 4. Far-field pattern of LEDs grown on CSS, BPSS, HPSS, and CPSS with an injection current of 400 mA. 6

  2. Fig. 5. External quantum efficiencies of LEDs grown on CSS, BPSS, HPSS,and CPSS. 7

  3. Conclusion The LED with ball-shape patterned sapphire substrate has the best crystalline quality and I–V characteristic. For the purpose of reducing total internal reflection, the LED with HPSS has the best performance on output power and external quantum efficiency. Comparing to the LED without patterned substrate, the LED with HPSS has 175% and 165% enhancement on output power and external quantum efficiency, respectively. 8

  4. References 世界材料網http://www.materialsnet.com.tw/DocView.aspx?id=10359 LED效率 http://laislab.myweb.hinet.net/led-1.htm 9

  5. Thank you for your attention 10

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