With the increasingly urgent demand for LED lighting and environmental pollution, the led vehicle lighting with its energy-saving and environmentally friendly features have a broad application space, the application of led vehicle lighting products in the lighting field is attracting the world’s attention. In general, the LED lights work stability, the quality is good or bad, and the lamp cooling is essential, the heat of the high brightness LED lamps on the market, often using the natural cooling effect is not satisfactory. LED lamps, led high bay light source to create LEDs, thermal structure, drives, lens, so the heat is also an important part, too high a temperature will cause the LED luminous efficiency of attenuation; the waste heat generated by the LED operation can not be effectively shed, directly caused by the fatal impact on the life of the LED. Therefore, the LED heat dissipation is the most important issue in the design of the LED lamps.
Thermal management is the main problem in the high-brightness LED applications
P-type doping of III-nitride limited by the solubility of the Lord and hole higher than that of Mg activation energy and heat are particularly vulnerable in the p-type region, and this heat through the entire structure must be dissipated in the heat sink; LED the thermal path of the device is a thermal conduction and convection; Sapphire substrates is extremely low thermal conductivity of the device thermal resistance increase, resulting in severe self-heating effect, have a devastating impact on device performance and reliability.