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Title: Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes

Abstract

Photonic crystals, in the form of closed-packed nano-pillar arrays patterned by nanosphere lithography, have been formed on the n-faces of InGaN thin-film vertical light-emitting diodes (LEDs). Through laser lift-off of the sapphire substrate, the thin-film LEDs conduct vertically with reduced dynamic resistances, as well as reduced thermal resistances. The photonic crystal plays a role in enhancing light extraction, not only at visible wavelengths but also at infrared wavelengths boosting heat radiation at high currents, so that heat-induced effects on internal quantum efficiencies are minimized. The observations are consistent with predictions from finite-difference time-domain simulations.

Authors:
; ; ;  [1]
  1. Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road (Hong Kong)
Publication Date:
OSTI Identifier:
22310861
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; EMISSION; EXTRACTION; FORECASTING; GALLIUM COMPOUNDS; HEAT; INDIUM COMPOUNDS; INFRARED RADIATION; LIGHT EMITTING DIODES; NITROGEN COMPOUNDS; QUANTUM EFFICIENCY; SAPPHIRE; SIMULATION; SUBSTRATES; THIN FILMS; VISIBLE RADIATION; WAVELENGTHS

Citation Formats

Cheung, Y. F., Li, K. H., Hui, R. S. Y., and Choi, H. W., E-mail: hwchoi@hku.hk. Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes. United States: N. p., 2014. Web. doi:10.1063/1.4893739.
Cheung, Y. F., Li, K. H., Hui, R. S. Y., & Choi, H. W., E-mail: hwchoi@hku.hk. Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes. United States. doi:10.1063/1.4893739.
Cheung, Y. F., Li, K. H., Hui, R. S. Y., and Choi, H. W., E-mail: hwchoi@hku.hk. Mon . "Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes". United States. doi:10.1063/1.4893739.
@article{osti_22310861,
title = {Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes},
author = {Cheung, Y. F. and Li, K. H. and Hui, R. S. Y. and Choi, H. W., E-mail: hwchoi@hku.hk},
abstractNote = {Photonic crystals, in the form of closed-packed nano-pillar arrays patterned by nanosphere lithography, have been formed on the n-faces of InGaN thin-film vertical light-emitting diodes (LEDs). Through laser lift-off of the sapphire substrate, the thin-film LEDs conduct vertically with reduced dynamic resistances, as well as reduced thermal resistances. The photonic crystal plays a role in enhancing light extraction, not only at visible wavelengths but also at infrared wavelengths boosting heat radiation at high currents, so that heat-induced effects on internal quantum efficiencies are minimized. The observations are consistent with predictions from finite-difference time-domain simulations.},
doi = {10.1063/1.4893739},
journal = {Applied Physics Letters},
number = 7,
volume = 105,
place = {United States},
year = {Mon Aug 18 00:00:00 EDT 2014},
month = {Mon Aug 18 00:00:00 EDT 2014}
}