Promoting Energy Transfer via Manipulation of Crystallization Kinetics of Quasi-2D Perovskites for Efficient Green Light-Emitting Diodes

Zhenyu Guo; Yu Zhang; Bingzhe Wang; Liding Wang; Ning Zhou; Zhiwen Qiu; Nengxu Li; Yihua Chen; Cheng Zhu; Haipeng Xie; Tinglu Song; Lei Song; Haibo Xue; Shuxia Tao; Qi Chen; Guichuan Xing; Lixin Xiao; Zhiwei Liu; Huanping Zhou

doi:10.1002/adma.202102246

Promoting Energy Transfer via Manipulation of Crystallization Kinetics of Quasi-2D Perovskites for Efficient Green Light-Emitting Diodes

Adv Mater. 2021 Oct;33(40):e2102246. doi: 10.1002/adma.202102246. Epub 2021 Aug 15.

Authors

Zhenyu Guo¹, Yu Zhang¹, Bingzhe Wang², Liding Wang³, Ning Zhou¹, Zhiwen Qiu¹, Nengxu Li¹, Yihua Chen¹, Cheng Zhu⁴, Haipeng Xie⁵, Tinglu Song⁶, Lei Song^{7

8}, Haibo Xue^{7

8}, Shuxia Tao^{7

8}, Qi Chen⁴, Guichuan Xing², Lixin Xiao⁹, Zhiwei Liu³, Huanping Zhou¹

Affiliations

¹ Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
² Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Macau, 999078, China.
³ Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing Engineering Technology Research Centre of Active Display, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
⁴ Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
⁵ Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, College of Physics and Electronics, Central South University, Changsha, 410083, China.
⁶ Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
⁷ Materials Simulation and Modelling, Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, Eindhoven, MB, 5600, the Netherlands.
⁸ Center for Computational Energy Research, Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, Eindhoven, MB, 5600, the Netherlands.
⁹ State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing, 100871, China.

PMID: 34396606
DOI: 10.1002/adma.202102246

Abstract

Quasi-2D (Q-2D) perovskites are promising materials applied in light-emitting diodes (LEDs) due to their high exciton binding energy and quantum confinement effects. However, Q-2D perovskites feature a multiphase structure with abundant grain boundaries and interfaces, leading to nonradiative loss during the energy-transfer process. Here, a more efficient energy transfer in Q-2D perovskites is achieved by manipulating the crystallization kinetics of different-n phases. A series of alkali-metal bromides is utilized to manipulate the nucleation and growth of Q-2D perovskites, which is likely associated with the Coulomb interaction between alkali-metal ions and the negatively charged PbBr₆ ^4- frames. The incorporation of K⁺ is found to restrict the nucleation of high-n phases and allows the subsequent growth of low-n phases, contributing to a spatially more homogeneous distribution of different-n phases and promoted energy transfer. As a result, highly efficient green Q-2D perovskites LEDs with a champion EQE of 18.15% and a maximum brightness of 25 800 cd m^-2 are achieved. The findings affirm a novel method to optimize the performance of Q-2D perovskite LEDs.

Keywords: alkali-metal cations; crystallization kinetics; perovskite light-emitting diodes; quasi-2D perovskites.

Abstract

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