Highly efficient quantum-dot light-emitting diodes with DNA-CTMA as a combined hole-transporting and electron-blocking layer.
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 (approximately 4%), high brightness (approximately 6580 cd/m(2)), low turn-on voltage (approximately 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.
Sun
Qingjiang
Q
School of Engineering, University of Dayton, Dayton, Ohio 45469, USA.
Subramanyam
Guru
G
Dai
Liming
L
Check
Michael
M
Campbell
Angela
A
Naik
Rajesh
R
Grote
James
J
Wang
Yongqiang
Y
D000818:Animals; D002593:Cetrimonium Compounds / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D004563:Electrochemistry; D004581:Electronics; D004583:Electrons; D049449:Luminescence; D036103:Nanotechnology; D045663:Quantum Dots; D012474:Salmon
D002593:Cetrimonium Compounds; D004247:DNA