Silicon-Doped Diamond-Like Composite Film to Improve the Thermal Dissipated Performance of Light-Emitting Diode

Abstract

With the progress of light-emitting diodes (LEDs) research deepening, LEDs are gaining more and more widespread. During the use of LED, the excessive temperature of the P-N junction has a bad influence on the life of the LED. In order to reduce the junction temperature of the LED, efficient thermal management has become the key to the popularity of LEDs. The graphite materials are promising thermal conductivity material due to their superior thermal conductivity. In this experiment, Al/AlCX/Diamond-like carbon (DLC) composite film was coated on the surface of the LED substrate by direct current (DC) sputtering and radio frequency (RF) magnetron sputtering. On studying the effect of this composite film on the thermal dissipation performance of LED, the results show that the Al/AlCX/DLC composite film can effectively improve the thermal conductivity of the LED and reduce the thermal resistance. When the LED was driven using a 350-mA drive current, the thermal resistance of the uncoated device was 36.69 K/W and the thermal resistance of the coated device was 30.06 K/W. Compared with the uncoated device, the thermal resistance of the coated device is reduced by 18.1% and the junction temperature is reduced by 4.27 °C.