Evaluation of the thermal performance of high-power LED using magnesium oxide thin film as heat spreader

The spin coating technique was used to synthesize MgO thin film on aluminium substrates. XRD diffraction proved the presence of (200), (220) and (222) MgO phase orientations. Film thickness (370 nm), the crystal size of 17.14 nm, low surface roughness of 12.8 nm and thermal conductivity (22.68 W/mK) were recorded for MgO film sample prepared from 0.6 M concentration. A noticeable reduction in junction temperature (Delta TJ -20.11 degrees C) and total thermal resistance (Delta Rth-tot -3.22 K/W) were recorded for LED fixed on 0.6 M MgO thin film sample. 8% reduction of thermal impedance was also recorded for the prepared film and proving it is free from internal structure degradation. Overall, a noticeable improvement in thermal performance of high-power LED was achieved with MgO thin film as a heat spreader and suggested it as a future alternative to the commercially available film-based heat spreader.