Ocean’s QD-LEDs with DNA
Owing to the narrow bright emission band, broad size-tunable emission wavelength, superior photostability, and excellent flexible-substrate compatibility, light-emitting diodes based on quantum dots (QDLEDs) are currently under intensive research and development for multiple consumer applications including flat panel displays and flat lighting. The commercialization QD-LEDs 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. Thus, Ocean and its collaborators developed QD-LEDs with a record high efficiency of 4%, high brightness at 6580 cd/m2, low turn-on voltage of 2.6 V, and significantly improved color purity by simply using deoxyribonucleic acid (DNA) complexed with cetyltrimetylammonium (CTMA) to form DNA-CTMA as a combined hole transporting and electron-blocking layer (HTL/EBL). This, together with controlled thermal decomposition of ligands from the QD shell, represents a novel combination and yet simple and very effective approach toward the development of highly efficient QD-LEDs with a high color purity. These highly efficient QD-LEDs with an excellent color purity are suitable for various applications, such as the next generation of flat-panel displays and flat lighting systems.
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*Qingjiang Sun, Guru Subramanyam, Liming Dai, Michael Check, Angela Campbell, Rajesh Naik, James Grote, and Yongqiang Wang, “Highly Efficient Quantum-Dot Light-Emitting Diodes with DNA#CTMA as a Combined Hole-Transporting and Electron-Blocking Layer, “ ACS Nano, 3 (3), 737-743, 2009.