Unprecedented random lasing in 2D organolead halide single-crystalline perovskite microrods

• Published in: Nanoscale Vol. 12; no. 35; pp. 18269 - 18277
• Main Authors: Roy, Pradip Kumar, Ulaganathan, Rajesh Kumar, Raghavan, Chinnambedu Murugesan, Mhatre, Swapnil Milind, Lin, Hung-I, Chen, Wei-Liang, Chang, Yu-Ming, Rozhin, Alex, Hsu, Yun-Tzu, Chen, Yang-Fang, Sankar, Raman, Chou, Fang-Cheng, Liang, Chi-Te
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 21.09.2020
• Subjects: Commercialization; Crystal structure; Crystallinity; Emission analysis; Lasing; Mathematical analysis; Optoelectronic devices; Perovskites; Q factors; Quantum wells; Room temperature; Single crystals
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/d0nr01171a

Three-dimensional organic-inorganic hybrid halide perovskites have been demonstrated as great materials for applications in optoelectronics and photonics. However, their inherent instabilities in the presence of moisture, light, and heat may hinder their commercialization. Alternatively, emerging two-dimensional (2D) organic-inorganic hybrid perovskites have recently attracted increasing attention owing to their great environmental stability and inherent natural quantum-well structure. In this work, we have synthesized a high-quality long-chain organic diammonium spacer assisted 2D hybrid perovskite FA-( N -MPDA)PbBr 4 (FA = formamidinium and N -MPDA = N -methylpropane-1,3-diammonium) by the slow evaporation at constant temperature method. The millimeter-sized single-crystalline microrods demonstrate low threshold random lasing behavior at room temperature. The single-crystalline 2D hybrid perovskite random laser achieved a very narrow linewidth (∼0.1 nm) with a low threshold (∼0.5 μJ cm −2 ) and a high quality factor (∼5350). Furthermore, the 2D hybrid microrod laser shows stable lasing emission with no measurable degradation after at least 2 h under continuous illumination, which substantially proves the stability of 2D perovskites. Our results demonstrate the promise of 2D organic-inorganic microrod-shaped perovskites and provide an important step toward the realization of high-performance optoelectronic devices. Low threshold random lasing was observed in a millimeter-sized 2D single-crystalline perovskite microrod. The lower value of the threshold can be attributed to the strong light confinement, long mean free path and large exciton binding energy.