Highly Efficient Quantum-Dot Light-Emitting Diodes with DNA−CTMA as a Combined Hole-Transporting and Electron-Blocking Layer

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• 作者：Qingjiang Sun ; Guru Subramanyam ; Liming Dai ; Michael Check ; Angela Campbell ; Rajesh Naik ; James Grote ; Yongqiang Wang
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：March 24, 2009
• 年：2009
• 卷：3
• 期：3
• 页码：737-743
• 全文大小：420K
• 年卷期：0
• ISSN：1936-086X

文摘

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.