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nature letter 浙大彭笑刚老师的新文章，全溶液QD-LED
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文章阐述了全溶液法制备QD-LED，采用多壳层结构QDs为发光层，制备的器件性能几乎均为目前最优。下面是摘要： Solution-processed optoelectronic and electronic devices are attractive owing to the potential for low-cost fabrication of large-areadevices and the compatibility with lightweight, flexible plastic substrates. Solution-processed light-emitting diodes (LEDs) using conjugated polymers or quantum dots as emitters have attracted great interest over the past two decades1,2. However, the overall performance of solution-processed LEDs2–5—including their efficiency, efficiency roll-off at high current densities, turn-on voltage and lifetime under operational conditions—remains inferior to that of the best vacuumdeposited organic LEDs6–8. Here we report a solution-processed,multilayerquantum-dot-basedLEDwith excellent performance and reproducibility. It exhibits colour-saturated deep-redemission, subbandgap turn-on at 1.7 volts, high external quantum efficiencies of up to 20.5 per cent, low efficiency roll-off (up to 15.1 per cent of theexternalquantumefficiency at 00mAcm22), and a long operational lifetime of more than 100,000 hours at 100 cdm22,making this device the best-performing solution-processed red LED so far, comparable to state-of-the-art vacuum-deposited organic LEDs2–8. This optoelectronic performance is achieved by inserting an insulating layer between the quantumdot layer and the oxide electron-transport layerto optimize charge balance in the device and preserve the superior emissive properties of the quantum dots. We anticipate that our results will be a starting point for further research, leading to highperformance, all-solution-processed quantum-dot-based LEDs ideal for next-generation display and solid-state lighting technologies. |
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2014-12-20 20:46:07, 7.07 M
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