Two-Dimensional Rigorous Coupled-Wave Analysis of Light Extraction Efficiency from Light-Emitting Diodes
Date Issued
2012
Date
2012
Author(s)
Fang, Cong-Min
Abstract
In this thesis, we model and analyze the emitting properties of the LED combined with periodic structure by using the rigorous electromagnetic analysis. Taking advantageous of the diffractive property of periodic structure is viewed as the promising method to improve the poor light extraction efficiency (LEE) of the gallium nitride based light-emitting diode (GaN-based LED). A key of our simulation method is the decomposition of the electric dipole embedded in the layered structure into plane waves, and the effect of the periodically patterned layer on the reflected and transmitted diffraction waves can be calculated by the rigorous coupled-wave analysis (RCWA) which is based on the plane wave expansion and is an exact solution of Maxwell’s equations. In our work, we investigate the various structural effects on the LEE in the thin film vertical LED, and then we try to guide some design trends to optimize the structural parameters for high LEE. The manner of design is not only theoretically analyzed but quantitatively demonstrated by the numerical simulation. Finally, we show that the ultra-high LEE~90% can be realized by the properly designed parameters of structure.
Subjects
GaN
light-emitting diode
light extraction efficiency
Type
thesis
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