Localized Bound Multiexcitons in Engineered Quasi‐2D Perovskites Grains at Room Temperature for Efficient Lasers

• DOI: 10.1002/adma.202211591
• Publication Date: 2023-03-15T04:09:17Z
• Authors: Guohui Li; Kai Lin; Kefan Zhao; Yang Huang; Ting Ji; Linlin Shi; Yuying Hao; Qihua Xiong; Kaibo Zheng; Tonu Pullerits; Yanxia Cui
• Keywords: Auger effect

Reducing the excitation threshold to minimize Joule heating is critical for realization of perovskite laser diodes. Although bound excitons are promising low laser, how generate them at room temperature applications still unclear in quasi-2D perovskite-based devices. In this work, via engineering PEA2 (CH3 NH3 )n-1 Pbn Br3n+1 microscopic grains by anti-solvent method, room-temperature multiexciton radiative recombination successfully demonstrated a remarkably pump density 0.97 µJ cm-2 , which only one-fourth that required 2D CdSe nanosheets. addition, well-defined translational momentum can restrict Auger detrimental emission. Furthermore, favorable increasing binding energies and biexcitons so as related recombination. Consequently, prepared <n = 8> phase film renders stimulated emission 13.7 reduced 58.6% relative amorphous counterpart with larger grains. The findings work expected facilitate development solution-processable multiexcitonic