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

Liu, Fangzhou1; Qin, Xinshun1; Han, Bing2; Chan, Christopher C. S.3; Ma, Chao3; Leung, Tik Lun1; Chen, Wei1; He, Yanling1,4; Loncaric, Ivor5; Grisanti, Luca5; Ovcar, Juraj5; Skoko, Zeljko6; Shi, Yingli1; Ling, Francis Chi Chung1; Huqe, Md Rashedul7; Zapien, Juan Antonio7; Wang, Shixun8; Su, Chun-Jen9; Jeng, U-Ser9,10; Wong, Kam Sing3; Ng, Alan Man Ching4; Gu, Meng2; Popovic, Jasminka5; Djurisic, Aleksandra B.1

2021-08-01

10.1002/adom.202100393

Advanced Optical Materials   影响因子和分区

2195-1071

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 Cs(0.5)FA(0.5)PbBr(3) phase (different from cubic FAPbBr(3) 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.

green emission perovskite light-emitting diodes quasi-2D perovskites Ruddlesden-Popper X-ray diffraction

SCI ; EI

英语

通讯

Seed Funding for Basic Research and Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong, RGC GRF Project[17301520,11210218,"7035-20G"] ; NSFC - "Research Cooperability" Program of the Croatian Science Foundation - European Union from the European Social Fund[62075187,"PZS2019-02-2068"] ; Shenzhen Fundamental Research Program[JCYJ20170412154447469]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000686517000001

WILEY-V C H VERLAG GMBH

20213410801647

Bromine compounds ; Efficiency ; Lead compounds ; Luminance ; Perovskite ; Positive ions

Minerals:482.2 ; Production Engineering:913.1 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Phys, Clearwater Bay, Hong Kong, Peoples R China
4.Southern Univ Sci & Technol, Dept Phys, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
5.Rudjer Boskovic Inst, Bijenicka 54, Zagreb 10000, Croatia
6.Univ Zagreb, Fac Sci, Dept Phys, Bijenicka 32, Zagreb 10000, Croatia
7.City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, 83 Tat Chee Ave, Hong Kong, Peoples R China
8.City Univ Hong Kong, Ctr Funct Photon CFP, Dept Mat Sci & Engn, 83 Tat Chee Ave, Hong Kong, Peoples R China
9.Natl Synchrotron Radiat Res Ctr, Hsinchu Sci Pk, Hsinchu, Taiwan
10.Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan

Liu, Fangzhou,Qin, Xinshun,Han, Bing,et al. Enhanced Light Emission Performance of Mixed Cation Perovskite Films-The Effect of Solution Stoichiometry on Crystallization[J]. Advanced Optical Materials,2021,9.

Liu, Fangzhou.,Qin, Xinshun.,Han, Bing.,Chan, Christopher C. S..,Ma, Chao.,...&Djurisic, Aleksandra B..(2021).Enhanced Light Emission Performance of Mixed Cation Perovskite Films-The Effect of Solution Stoichiometry on Crystallization.Advanced Optical Materials,9.

Liu, Fangzhou,et al."Enhanced Light Emission Performance of Mixed Cation Perovskite Films-The Effect of Solution Stoichiometry on Crystallization".Advanced Optical Materials 9(2021).