Highly efficient quantum-dot light emitting diodes with DNA-CTMA as combined hole transporting and electron-blocking layer
Document Type
Article
Publication Date
2-17-2009
Publication Source
ACS Nano
Abstract
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 (∼4%), high brightness (∼6580 cd/m2), low turn-on voltage (∼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.
Inclusive pages
737–743
ISBN/ISSN
1936-0851
Publisher
ACS Publication
Volume
3
Peer Reviewed
yes
Issue
3
Keywords
quantum dot, light-emitting diode (LED), QD-LED, DNA, flat display
eCommons Citation
Sun, Q.; Subramanyam, Guru; Dai, Liming; Check, M.; Campbell, A.; Naik, Rajesh; Grote, James; and Wang, Yongqiang, "Highly efficient quantum-dot light emitting diodes with DNA-CTMA as combined hole transporting and electron-blocking layer" (2009). Electrical and Computer Engineering Faculty Publications. 21.
https://ecommons.udayton.edu/ece_fac_pub/21
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