Nanocrystal-based light-emitting diodes utilizing high-efficiency nonradiative energy transfer for color conversion.
We report a practical implementation of high-efficiency color conversion in an electrically pumped light-emitting diode (LED) using nonradiative energy transfer. On the basis of a new LED design that offers both strong energy-transfer coupling and efficient carrier injection, we show that a hybrid structure comprising a single monolayer of CdSe nanocrystals assembled on top of an InGaN/GaN quantum well provides nearly 10% color conversion efficiency. This value is significantly higher than that for a traditional absorption-re-emission color-conversion scheme in a similar device structure. Furthermore, these hybrid devices can also provide improved efficiencies, compared not only to phosphor-based structures but also to stand-alone LEDs.
Achermann
Marc
M
Los Alamos National Laboratory, New Mexico 87545, USA.
Petruska
Melissa A
MA
Koleske
Daniel D
DD
Crawford
Mary H
MH
Klimov
Victor I
VI
D002104:Cadmium / Q000737:chemistry; D003116:Color; D004735:Energy Transfer; D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements; D049329:Nanostructures; D010758:Phosphorus / Q000737:chemistry; D012643:Selenium / Q000737:chemistry; D012666:Semiconductors
D002104:Cadmium; D010758:Phosphorus; D012643:Selenium