Affiliation:
1. Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu 215123 P. R. China
2. Macau Institute of Materials Science and Engineering (MIMSE) MUST‐SUDA Joint Research Center for Advanced Functional Materials Zhuhai MUST Science and Technology Research Institute Macau University of Science and Technology Taipa Macau 999078 P. R. China
3. Institute of Materials Science Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen Guangdong 518055 P. R. China
4. Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou Jiangsu 215123 P.R. China
Abstract
AbstractThanks to the extensive efforts toward optimizing perovskite crystallization properties, high‐quality perovskite films with near‐unity photoluminescence quantum yield are successfully achieved. However, the light outcoupling efficiency of perovskite light‐emitting diodes (PeLEDs) is impeded by insufficient light extraction, which poses a challenge to the further advancement of PeLEDs. Here, an anisotropic multifunctional electron transporting material, 9,10‐bis(4‐(2‐phenyl‐1H‐benzo[d]imidazole‐1‐yl)phenyl) anthracene (BPBiPA), with a low extraordinary refractive index (ne) and high electron mobility is developed for fabricating high‐efficiency PeLEDs. The anisotropic molecular orientations of BPBiPA can result in a low ne of 1.59 along the z‐axis direction. Optical simulations show that the low ne of BPBiPA can effectively mitigate the surface plasmon polariton loss and enhance the photon extraction efficiency in waveguide mode, thereby improving the light outcoupling efficiency of PeLEDs. In addition, the high electron mobility of BPBiPA can facilitate balanced carrier injection in PeLEDs. As a result, high‐efficiency green PeLEDs with a record external quantum efficiency of 32.1% and a current efficiency of 111.7 cd A−1 are obtained, which provides new inspirations for the design of electron transporting materials for high‐performance PeLEDs.
Funder
Collaborative Innovation Center of Suzhou Nano Science and Technology
Higher Education Discipline Innovation Project
Cited by
18 articles.
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