Affiliation:
1. College of Optoelectronics Key Laboratory of Interface Science and Engineering in Advanced Materials Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China
2. Chemical physics division and NanoLund Lund University Box 124 Lund 22100 Sweden
3. Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030006 China
4. Department of Physics Tsinghua University Beijing 100084 China
Abstract
AbstractReducing the excitation threshold to minimize the Joule heating is critical for the realization of perovskite laser diodes. Although bound excitons are promising for low threshold laser, how to generate them at room temperature for laser applications is still unclear in quasi‐2D perovskite‐based devices. In this work, via engineering quasi‐2D perovskite PEA2(CH3NH3)n‐1PbnBr3n+1 microscopic grains by the anti‐solvent method, room‐temperature multiexciton radiative recombination is successfully demonstrated at a remarkably low pump density of 0.97 µJ cm−2, which is only one‐fourth of that required in 2D CdSe nanosheets. In addition, the well‐defined translational momentum in quasi‐2D perovskite grains can restrict the Auger recombination which is detrimental to radiative emission. Furthermore, the quasi‐2D perovskite grains are favorable for increasing binding energies of excitons and biexcitons and so as the related radiative recombination. Consequently, the prepared <n = 8> phase quasi‐2D perovskite film renders a threshold of room‐temperature stimulated emission as low as 13.7 µJ cm−2, reduced by 58.6% relative to the amorphous counterpart with larger grains. The findings in this work are expected to facilitate the development of solution‐processable perovskite multiexcitonic laser diodes.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shanxi Province
China Scholarship Council
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
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