Abstract
In this paper, we report a single-chip large area (5×5 mm2) InGaN/GaN blue LED with the optical output power of 4.3 W. This device consists of 24-stages small LED-cells that are connected in series. Driven at 500 mA, the forward voltage is measured to be 87.2 V with a reverse current of 2.63×10-9 A at -120 V. The comparison of two different cooling schemes, i.e., with/without fan cooling, was made; the results suggest that the thermal convection between the heat sink and air is more critical. A simple white LED package was also tried by covering silicone gel mixed with yttrium aluminum garnet (YAG) phosphor. The luminous flux and the correlated color temperature (CCT) were measured to be 1090 lm and 5082 K, when the device was driven at 500 mA. This report also demonstrated the feasibility of the application for camera flash.
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