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All-Perovskite Emission Architecture for White Light-Emitting Diodes
ACS Nano ( IF 15.8 ) Pub Date : 2018-09-17 00:00:00 , DOI: 10.1021/acsnano.8b06196
Jian Mao 1 , Hong Lin 1 , Fei Ye 1 , Minchao Qin 2 , Jeffrey M. Burkhartsmeyer 3 , Hong Zhang 1 , Xinhui Lu 2 , Kam Sing Wong 3 , Wallace C. H. Choy 1
Affiliation  

We demonstrate all-perovskite light-emitting diodes (PeLEDs) with white emission on the basis of simultaneously solving a couple of issues including the ion exchanges between different perovskites, solvent incompatibility in the solution process of stacking different perovskites and carrier transport layers, as well as the energy level matching between each layer in the whole device. The PeLEDs are built with a two-dimensional (CH3CH2CH2NH3)2CsPb2I7 perovskite that emits red light, CsPb(Br,Cl)3 quantum dots that emit a cyan color, and an interlayer composed of bis(1-phenyl-1H-benzo[d]imidazole)phenylphosphine oxide (BIPO) and poly(4-butylphenyl-diphenyl-amine) (Poly-TPD). The interlayer is designed to realize desirable white electroluminescence by tuning the electron and hole transportation and distribution in-between multilayers. With this PeLED configuration, we achieve the typical white light with chromaticity coordinates of (0.32, 0.32) in Commission Internationale de L’Eclairage (CIE) 1931 color space diagram and steady CIE coordinates in a wide range of driving current densities (from 2.94 to 59.29 mA/cm2). Consequently, our work, as the starting point for future research of all-perovskite white PeLEDs, will contribute to the future applications of PeLEDs in lighting and display. In addition, we believe that the proposed material and all-perovskite concept will leverage the design and development of more perovskite-based devices.

中文翻译:

用于白色发光二极管的全钙钛矿发射架构

我们在同时解决一系列问题(包括不同钙钛矿之间的离子交换,在堆叠不同钙钛矿和载体传输层的过程中溶剂不相容)同时解决两个问题的基础上,展示了具有白色发射的全钙钛矿发光二极管(PeLED)。整个设备各层之间的能量水平匹配。PeLED是由发出红光的二维(CH 3 CH 2 CH 2 NH 32 CsPb 2 I 7钙钛矿,发出青色的CsPb(Br,Cl)3量子点以及由下列元素组成的中间层构建的双(1-苯基-1H-苯并[ d乙二咪唑)苯基氧化膦(BIPO)和聚(4-丁基苯基-二苯胺)(Poly-TPD)。通过调节多层之间的电子和空穴的传输和分布,将中间层设计为实现所需的白色电致发光。通过这种PeLED配置,我们可以在国际照明委员会(CIE)1931年色空间图中获得色度坐标为(0.32,0.32)的典型白光,并在各种驱动电流密度范围内(从2.94到1.52)获得稳定的CIE坐标。 59.29 mA /厘米2)。因此,我们的工作作为全钙钛矿白色PeLED未来研究的起点,将为PeLED在照明和显示领域的未来应用做出贡献。此外,我们认为,提出的材料和全钙钛矿概念将利用更多基于钙钛矿的设备的设计和开发。
更新日期:2018-09-17
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