Open AccessResearch of LED light extraction efficiency of photonic crystal with square and hexagonal lattice
Author(s) -
Jian Chen,
Xiaoli Li,
Haihua Li,
Qingkang Wang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.6216
Subject(s) - photonic crystal , finite difference time domain method , hexagonal lattice , materials science , square lattice , hexagonal crystal system , square (algebra) , photonics , optics , light emitting diode , optoelectronics , band gap , diode , condensed matter physics , physics , crystallography , geometry , mathematics , chemistry , antiferromagnetism , ising model
Using finite-difference time-domain FDTD method, we found the relationship between filling factor and band gap of square and hexagonal array of circular photonic crystal, and obtained the geometric parameters of the 2D photonic crystal, for which the number of bandgaps are the greater. Using FDTD method to calculate the extraction efficiency of the photonic crystals with the parameters, we verified the enhancement in extraction efficency of the GaN-based blue light-emitting diode based on the square and hexagonal array of circular photonic crystals with the the parameters, and the hexagonal arrangement is better than the square arrangement. By using the bang gap theory and equivalent medium theory was analyzed the mechanism of antireflection.