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Title: Advanced method for increasing the efficiency of white light quantum dot LEDs

Abstract

Covering a light-emitting diode (LED) with quantum dots (QDs) can produce a broad spectrum of white light. However, current techniques for applying QDs to LEDs suffer from a high density of defects and a non-uniform distribution of QDs, which, respectively, diminish the efficiency and quality of emitted light. Oak Ridge National Laboratory (ORNL) has the unique capability to thermally anneal QD structures at extremely high power densities for very short durations. This process, called pulse thermal processing (PTP), reduces the number of point defects while maintaining the size and shape of the original QD nanostructure. Therefore, the efficiency of the QD wavelength conversion layer is improved without altering the emission spectrum defined by the size distribution of theQD nanoparticles. The current research uses a thermal model to predict annealing temperatures during PTP and demonstrates up to a 300% increase in photoluminescence for QDs on passive substrates.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1048755
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physica Status Solidi A
Additional Journal Information:
Journal Volume: 208; Journal Issue: 8; Journal ID: ISSN 1862-6300
Country of Publication:
United States
Language:
English

Citation Formats

Duty, Chad E, Bennett, Charlee J C, Sabau, Adrian S, Jellison, Jr, Gerald Earle, Boudreaux, Philip R, Walker, Steven C, and Ott, Ronald D. Advanced method for increasing the efficiency of white light quantum dot LEDs. United States: N. p., 2011. Web. doi:10.1002/pssa.201026674.
Duty, Chad E, Bennett, Charlee J C, Sabau, Adrian S, Jellison, Jr, Gerald Earle, Boudreaux, Philip R, Walker, Steven C, & Ott, Ronald D. Advanced method for increasing the efficiency of white light quantum dot LEDs. United States. https://doi.org/10.1002/pssa.201026674
Duty, Chad E, Bennett, Charlee J C, Sabau, Adrian S, Jellison, Jr, Gerald Earle, Boudreaux, Philip R, Walker, Steven C, and Ott, Ronald D. 2011. "Advanced method for increasing the efficiency of white light quantum dot LEDs". United States. https://doi.org/10.1002/pssa.201026674.
@article{osti_1048755,
title = {Advanced method for increasing the efficiency of white light quantum dot LEDs},
author = {Duty, Chad E and Bennett, Charlee J C and Sabau, Adrian S and Jellison, Jr, Gerald Earle and Boudreaux, Philip R and Walker, Steven C and Ott, Ronald D},
abstractNote = {Covering a light-emitting diode (LED) with quantum dots (QDs) can produce a broad spectrum of white light. However, current techniques for applying QDs to LEDs suffer from a high density of defects and a non-uniform distribution of QDs, which, respectively, diminish the efficiency and quality of emitted light. Oak Ridge National Laboratory (ORNL) has the unique capability to thermally anneal QD structures at extremely high power densities for very short durations. This process, called pulse thermal processing (PTP), reduces the number of point defects while maintaining the size and shape of the original QD nanostructure. Therefore, the efficiency of the QD wavelength conversion layer is improved without altering the emission spectrum defined by the size distribution of theQD nanoparticles. The current research uses a thermal model to predict annealing temperatures during PTP and demonstrates up to a 300% increase in photoluminescence for QDs on passive substrates.},
doi = {10.1002/pssa.201026674},
url = {https://www.osti.gov/biblio/1048755}, journal = {Physica Status Solidi A},
issn = {1862-6300},
number = 8,
volume = 208,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2011},
month = {Sat Jan 01 00:00:00 EST 2011}
}