TY - JOUR
T1 - Advanced method for increasing the efficiency of white light quantum dot LEDs
AU - Duty, Chad E.
AU - Bennett, Charlee J.C.
AU - Sabau, Adrian S.
AU - Jellison, Gerald E.
AU - Boudreaux, Phillip R.
AU - Walker, Steven C.
AU - Ott, Ron
PY - 2011/8
Y1 - 2011/8
N2 - 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 the QD 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.
AB - 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 the QD 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.
KW - modeling
KW - photoluminescence
KW - quantum dot
KW - rapid thermal processing
UR - http://www.scopus.com/inward/record.url?scp=80051692383&partnerID=8YFLogxK
U2 - 10.1002/pssa.201026674
DO - 10.1002/pssa.201026674
M3 - Article
AN - SCOPUS:80051692383
SN - 1862-6300
VL - 208
SP - 1980
EP - 1982
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
IS - 8
ER -