Abstract
We fabricated three types of high luminous efficiency white light emitting diodes (LEDs). The first is the white LED, which had a high luminous efficiency (ηL) of 161 lm/W with the high luminous flux (φv) of 9.89 lm at a forward-bias current of 20 mA. The blue LED had a high output power (φe) of 42.2 mW and a high external quantum efficiency (ηex) of 75.5%. The second is the high luminous efficiency white LED with a low forward-bias voltage (Vf) of 2.80 V, which was almost equal to the theoretical limit. ηL and wall-plug efficiency (WPE) were 169 lm/W and 50.8%, respectively, at 20 mA. They were approximately twice higher than those of a tri-phosphor fluorescent lamp (90 lm/W and 25%). The third is the high power white LED fabricated from the high power blue LED with high φe of 651 mW at 350 mA. φv, ηL, and WPE of the high power white LED were 145 lm, 134 lm/W, and 39.6% at 350 mA, respectively.
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