An Opto-Thermal Study Of High Brightness 280 Nm Emission Algan Micropixel Light-Emitting Diode Arrays

We present a study of the light output power and the thermal impedance of 281 nm emission AlGaN based micropixel LEDs. A modular interconnected micropixel array design is presented which enables dense packing with area and power scalability. We study 5-15 mu m diameter stand-alone devices and parallel-connected micropixel arrays with 5 mu m interpixel gaps. A standalone 5 mu m pixel emits 291 W cm(-2) at 10.2 kA cm(-2) DC-drive. A power as high as 23 mW (361 W cm(-2)) was measured at a pulsed-pump current of 800 mA (similar to 15 kA cm(-2)) for an interconnected array. These are the smallest and brightest DUV LEDs to date.