六棱锥衬底旋转角影响LED效率的模拟探究

Simulation of GaN-based LEDs on Hexagonal Pyramid-shaped Patterned Sapphire Substrate with Different Rotation Angles

摘要:

以正六棱锥型图形化蓝宝石衬底GaN基LED为研究对象，设计并探讨了正六棱锥图案在排布过程中旋转角的变化对LED出光效率的影响，得出各面光通量随旋转角变化的规律：在0°~30°范围，随着旋转角的增大，总光通量与顶部光通量有下降趋势，底部光通量有增长趋势。当六棱锥旋转角在0°~6°范围内时，LED芯片的总光通量和顶部光通量均有最优值。综合考虑，旋转角为0°~6°的六棱锥型图形衬底对正装LED的出光效率有最佳的优化效果。

Abstract:

Simulated is the light extraction efficiency of GaN based LEDs fabricated on hexagonal pyramid shaped patterned sapphire substrate (PSS) with different rotation angles. It is revealed that as the rotation angle of hexagonal pyramids changes, the luminous flux from all six facets of LED chips changes in different trends. When the rotation angle rises from 0° to 30°, the top and total luminous flux decreases, but the bottom luminous flux increases inversely. Further, both the top and total luminous fluxes reach the maximum when the rotation angle is at the range of 0~6°. Combining the optical performance with the processing technique, it is safe to conclude that the hexagonal pyramid shaped PSS LEDs with rotation angle of 0~6° have the highest light extraction efficiency.