Journal
ACS NANO
Volume 3, Issue 3, Pages 737-743Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn8009079
Keywords
quantum dot; light-emitting diode (LED); QD-LED; DNA; flat display
Categories
Funding
- AFOSR [FA9550-06-1-0384]
- AFRL/RX
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Owing to their narrow bright emission band, broad size-tunable emission wavelength, superior photostability, and excellent flexible-substrate compatibility, light-emitting diodes based on quantum dots (QD-LEDs) are currently under intensive research and development for multiple consumer applications including flat-panel displays and flat lighting. However, their commercialization is still precluded by the slow development to date of efficient QD-LEDs as even the highest reported efficiency of 2.0% cannot favorably compete with their organic counterparts. Here, we report QD-LEDs with a record high efficiency (similar to 4%), high brightness (similar to 6580 cd/m(2)), low turn-on voltage (similar to 2.6 V), and significantly improved color purity by simply using deoxyribonucleic acid (DNA) complexed with cetyltrimetylammonium (CTMA) (DNA-CTMA) as a combined hole transporting and electron-blocking layer (HTL/EBL). This, together with controlled thermal decomposition of ligand molecules from the QD shell, represents a novel combined, but simple and very effective, approach toward the development of highly efficient QD-LEDs with a high color purity.
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