HIGH POWER SEMIPOLAR {30-3-1} LIGHT-EMITTING DIODES WITH LOW CURRENT DROOP AND LOW THERMAL DROOP

摘要

A high power semipolar {30-3-1 } light-emitting diode (LED) with low current droop and low thermal droop. Specifically, a thick active layer is used in order to reduce efficiency droop. For example, the LED's efficiency is higher than 40% with an active layer thickness larger than 10 nm. Experimental data shows the LED's efficiency droop is less than 1% at 35 A/cm2, 5% at 50 A/cm2, 10% at 100 A/cm2, and/or 20% at 1000 A/cm2. Consequently, the LED's efficiency droop is lower than that of a polar (c-plane) LED operating at a similar current density with a similar indium composition. Moreover, the LED has a small device area less than about 0.1 mm2 in which the LED's light output power is over about 1 W.