高性能、低成本新型量子点发光二极管的研究

项目名称： 高性能、低成本新型量子点发光二极管的研究

项目编号： No.91433204

项目类型： 重大研究计划

立项/批准年度： 2015

项目学科： 分析化学

项目作者： 彭笑刚

作者单位： 浙江大学

项目金额： 350万元

中文摘要： 2013年下半年，我们发明了一种性能优越的新型量子点发光二极管（QLED）：绝缘插层QLED。以红光原型器件为例，包括效率（20.5%的外量子效率）、大功率性能（100 mA cm-2的条件下，外量子效率>15%）和器件寿命（100 cd m 2的初始亮度下半衰期超过100,000小时）在内的综合性能优于目前所有溶液工艺制备的LED。更加重要的是，这种新型QLED的制备工艺与聚合物LED（PLED）类似，以低成本的溶液加工为基础。与目前最好的PLED比较，其最大EQE并不逊色，且其大功率性能超过所有PLED。本项目计划研究这种新型QLED相关基础科学问题，包括其工作机制——尤其是绝缘层的作用、多色大功率高效器件、分别适用于固态照明和显示的白光QLED、高性能非镉量子点器件、QLED的失效机制等。深入研究这种拥有完全知识产权的新型QLED，将使我国在QLED基础研究与产业化方面占据制高点。

中文关键词： 发光二极管；量子点；外量子效率；稳定；低成本

英文摘要： Based on our newly invented quantum-dot LED (QLED)—insertion of insulator thin-layer QLED (patent was filed in March 2014), this proposal intends to study the related fundamental sciences. The work shall focus on the key aspects of this new type of QLED devices. We aim to study working mechanisms of the new type of QLEDs—especially the function(s) of the insulator thin-layer, extension of high efficiency and high power devices to all colors from the demonstrated red prototype QLEDs, white QLEDs for both display and solid-state-lighting applications, high-performance QLEDs based on non-cadmium quantum dots, and failure mechanisms of QLEDs at work conditions. To our knowledge, our prototype red QLEDs represent the best-performing solution-processed red LEDs to date and comparable to the state-of-art vacuum-deposited OLEDs. Specifically, our QLED exhibits color-saturated deep-red emission, high external quantum efficiency (EQE) up to 20.5%, low efficiency roll-off (> 15% of EQE at 100 mA cm-2), and a long operational lifetime of more than 100,000 hours at 100 cd m-2. More importantly, similar to polymer LEDs (PLEDs), this new type of QLEDs, except the top silver electrodes, were fabricated by solution-processable techniques. In comparison to the best PLEDs reported in literature, this new type of QLEDs were comparable in terms of the maximum EQE (20.5%). Its performance becomes even more advantageous while comparing to PLEDs at a high power density needed for practical applications. Fundamental studies related to this new type of QLEDs should offer China a good position to commercialize QLEDs, which is of importance for both display and solid-state-lighting.

英文关键词： light-emitting diode;quantum dot;external quantum efficiency;stable;low-cost