Premium
Advanced method for increasing the efficiency of white light quantum dot LEDs
Author(s) -
Duty Chad E.,
Bennett Charlee J. C.,
Sabau Adrian S.,
Jellison Gerald E.,
Boudreaux Phillip R.,
Walker Steven C.,
Ott Ron
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201026674
Subject(s) - light emitting diode , quantum dot , optoelectronics , materials science , photoluminescence , diode , nanostructure , wavelength , annealing (glass) , quantum efficiency , light emission , nanotechnology , composite material
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.