Design and simulation of superperiodic photonic-crystal light emitting diodes with highly directive luminance characteristics

Abstract

By use of finite-differene time-domain analysis for lightwave devices, a novel super-periodic photonic-crystal light-emitting diode (LED) design exhibiting high-luminance patterns is proposed for applications that require highly-directive vertical light extraction. The device design is made on the theoretical consideration on the density of radiation modes within the photonic band coupled with far-field diffraction of the spontaneously-emitted light from a structure with double periodicity.