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nature letter Õã´óÅíЦ¸ÕÀÏʦµÄÐÂÎÄÕ£¬È«ÈÜÒºQD-LED
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ÎÄÕ²ûÊöÁËÈ«ÈÜÒº·¨ÖƱ¸QD-LED£¬²ÉÓöà¿Ç²ã½á¹¹QDsΪ·¢¹â²ã£¬ÖƱ¸µÄÆ÷¼þÐÔÄܼ¸ºõ¾ùΪĿǰ×îÓÅ¡£ÏÂÃæÊÇÕªÒª£º 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¨C5¡ªincluding their efficiency, efficiency roll-off at high current densities, turn-on voltage and lifetime under operational conditions¡ªremains inferior to that of the best vacuumdeposited organic LEDs6¨C8. 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¨C8. 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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