DataVXAdvanced Optical MaterialsPaper
journal article·2021-11Open access

Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Fangzhou Liu, Xinshun Qin, Bing Han, Christopher C. S. Chan, Chao Ma, Tik Lun Leung, Wei Chen, Yanling He, Ivor Lončarić, Luca Grisanti, Juraj Ovčar, Željko Skoko, Yingli Shi, Francis Chi Chung Ling, Md Rashedul Huqe, Juan Antonio Zapien, Shixun Wang, Chun‐Jen Su, U‐Ser Jeng, Kam Sing Wong, Alan Man Ching Ng, Meng Gu, Jasminka Popović, Aleksandra B. Djurišić

Advanced Optical Materials· Volume 9· Issue 21
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Source abstract

Abstract

Abstract The performance of quasi‐2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs‐only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA‐only and Cs‐only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light‐emitting performance.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics The University of Hong Kong Pokfulam Road Hong Kong Hong Kong SAR China

Department of Materials Science and Engineering Southern University of Science and Technology No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China

Department of Physics The Hong Kong University of Science and Technology Clearwater Bay Hong Kong Hong Kong SAR China

Department of Physics Southern University of Science and Technology No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China

Ruđer Bošković Institute Bijenička 54 Zagreb 10000 Croatia

Department of Physics Faculty of Science University of Zagreb Bijenička 32 Zagreb 10000 Croatia

Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR China

Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR China

National Synchrotron Radiation Research Center Hsinchu Science Park Hsinchu 30076 Taiwan

Department of Chemical Engineering National Tsing Hua University Hsinchu 30013 Taiwan

Funding

National Natural Science Foundation of China · Shenzhen Fundamental Research Program

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