Performance Comparison of Different Buffer/Substrate Material Combination based Ultra Bright Blue LED

The paper reports on performance comparison of ultra-bright blue LED using different substrate and buffer layer combination. The combination is taken as buffer layer/substrate in LED like ZnO/4H-SiC, GaN/Ga
₂
O
₃
, GaN/GaN & GaN/4H-SiC respectively. The I-V Characteristics of combination ZnO/4H-SiC & GaN/4H-SiC are complimenting each other. The output power gain in ZnO/4H-SiC LED increases by a factor of 10 in comparison to GaN/4H-SiC LED. Similarly, the power spectral density of ZnO/4H-SiC LED is found to be 4 times to that of GaN/4H-SiC LED. The main advantageous property of 4H-SiC is that its thermal conductivity is excellent in comparison to others and a better substitute for low cost production devices. All the analysis is carried out by using Silvaco ATLAS 2D simulator.