Mechanisms of the asymmetric light output enhancements in a-plane GaN light-emitting diodes with photonic crystals
Journal
IEEE Journal of Quantum Electronics
Journal Volume
50
Journal Issue
12
Pages
951-956
Date Issued
2014
Author(s)
Abstract
The unique properties of nonpolar GaN light-emitting diodes (LEDs) have the advantages of generating polarized light emission. The employment of asymmetric 2-D photonic crystals (PhCs) can further enhance the light polarization ratio. In addition, it was generally recognized that the Purcell effect can increase the internal quantum efficiency of the LEDs with PhCs. In this paper, we study the properties of optical modes from different crystal planes. The Purcell effect is analyzed based on the PhCs and material crystal orientations. With different transition probability of the polarized photons in valence bands, the corresponding Purcell effect enhancement on the quantum efficiency varies.
Type
journal article