Cai Wanqing, Chen Ziming, Chen Dongcheng, Su Shijian, Xu Qinghua, Yip Hin-Lap, Cao Yong
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China
Department of Chemistry, National University of Singapore 117543 Singapore.
RSC Adv. 2019 Sep 3;9(47):27684-27691. doi: 10.1039/c9ra05270d. eCollection 2019 Aug 29.
Because of their high efficiency and sharp emission, perovskite light-emitting diodes are a promising candidate for next-generation lighting techniques. However, the relatively poor stability of perovskite light-emitting diodes lowers their utility. Therefore, a highly stable perovskite light-emitting diode has to be developed to meet the commercial demand. Herein, we report a highly stable CsPbBr light-emitting diode simple polymer treatment. The addition of 2-methyl-2-oxazoline in perovskite film assists the formation of CsPbBr nanocrystals, improving the quality and photoluminescence property of perovskite film. Based on such CsPbBr nanocrystals and polymer hybrid film, our device presents a high external quantum efficiency and luminance of around 3.0% and 16 648 cd m, respectively. Moreover, an excellent device half-lifetime of more than 2.4 hours has been achieved, under continuous operation at a relatively high initial luminance of 1000 cd m, representing one of the most stable PeLEDs operated at such high initial luminance.
由于其高效率和尖锐发射，钙钛矿发光二极管是下一代照明技术的有前途的候选者。然而，钙钛矿发光二极管相对较差的稳定性降低了它们的实用性。因此，必须开发一种高度稳定的钙钛矿发光二极管以满足商业需求。在此，我们报道了一种通过简单聚合物处理获得的高度稳定的CsPbBr发光二极管。在钙钛矿薄膜中添加2-甲基-2-恶唑啉有助于CsPbBr纳米晶体的形成，提高了钙钛矿薄膜的质量和光致发光性能。基于这种CsPbBr纳米晶体和聚合物混合薄膜，我们的器件分别呈现出约3.0%的高外量子效率和16648 cd/m²的亮度。此外，在1000 cd/m²的相对较高初始亮度下连续运行时，实现了超过2.4小时的出色器件半衰期，这代表了在如此高初始亮度下运行的最稳定的PeLED之一。
