研究目的
Investigating the effect of photonic crystals on the light extraction efficiency of GaN-based LED for different polarization modes of spontaneous radiation.
研究成果
The LEE of different polarization modes have been simulated using FDTD for three photonic crystal structures. The TE-mode and TM-mode LEE will reduce when the discontinuity of the structure from the propagation direction changes. Both TE and TM mode enhances in cylindrical-PhC LED, but TE-mode LEE is always larger than that of TM mode. LEE of TM mode surpasses TE mode from 530 nm to 540 nm in compound-PhC LED. Based on this, a multi-layer-compound-PhC-LED is proposed, in which TM-mode LEE is increased by 1.45 times at a wavelength of 532 nm, and the TM-mode illuminous intensity will be larger than that of TE mode. We can change the domination of TE and TM mode by using photonic crystal without changing the energy band.
研究不足
The study is limited to simulation results and does not include experimental validation. The effects of photonic crystals on the light extraction efficiency are analyzed only for specific structures and arrangements.
