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Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach

Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach
Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach

Based on effective-medium approximation, we analytically optimize the color conversion of GaN-based lightemitting p-n junctions, with respect to the size and spatial density of the used photonic crystals (PhCs), being filled with quantum dots (QDs). The model is two-dimensional and the incoherent excitation into the multiple quantum wells is mimicked by line sources of random electric and magnetic currents. Optimal operation is achieved by suppressing the radiation extraction for one visible color and simultaneously maximizing the emission for another color. For these cases, the field gets inevitably concentrated into the PhCs of QDs, where the conversion occurs, and the performance of the device is maximized. Several examples from these ultra-performing designs are provided, within which a secondary sweep can be applied by posing extra constraints related to cost or ease of fabrication.

0740-3224
1105-1112
Valagiannopoulos, Constantinos
6cb3663f-981a-43db-9767-d6875c335378
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Valagiannopoulos, Constantinos
6cb3663f-981a-43db-9767-d6875c335378
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Valagiannopoulos, Constantinos and Lagoudakis, Pavlos G. (2018) Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach. Journal of the Optical Society of America B, 35 (5), 1105-1112. (doi:10.1364/JOSAB.35.001105).

Record type: Article

Abstract

Based on effective-medium approximation, we analytically optimize the color conversion of GaN-based lightemitting p-n junctions, with respect to the size and spatial density of the used photonic crystals (PhCs), being filled with quantum dots (QDs). The model is two-dimensional and the incoherent excitation into the multiple quantum wells is mimicked by line sources of random electric and magnetic currents. Optimal operation is achieved by suppressing the radiation extraction for one visible color and simultaneously maximizing the emission for another color. For these cases, the field gets inevitably concentrated into the PhCs of QDs, where the conversion occurs, and the performance of the device is maximized. Several examples from these ultra-performing designs are provided, within which a secondary sweep can be applied by posing extra constraints related to cost or ease of fabrication.

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More information

Accepted/In Press date: 14 March 2018
e-pub ahead of print date: 13 April 2018
Published date: 1 May 2018

Identifiers

Local EPrints ID: 422416
URI: https://eprints.soton.ac.uk/id/eprint/422416
ISSN: 0740-3224
PURE UUID: 00b1e522-63e1-4530-b8fd-adaa07ac7730

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Date deposited: 23 Jul 2018 16:31
Last modified: 25 Apr 2019 16:30

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Contributors

Author: Constantinos Valagiannopoulos

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