Low threshold Random Lasing in 2D Organolead Halide Single-Crystalline Perovskite Microrods

Swapnil Milind Mhatre^1*, Pradip Kumar Roy¹, Rajesh Kumar Ulaganathan², Raghavan Chinnambedu Murugesan³, Hung-I Lin¹, Wei-Liang Chen², Yu-Ming Chang², Alex Rozhin³, Yun-Tzu Hsu¹, Yang-Fang Chen¹, Raman Sankar^2,4, Fang-Cheng Chou^2,5,6, Chi-Te Liang¹

¹Department of Physics, National Taiwan University, Taipei 10617, Taiwan
²Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
³Nanoscience Laboratory, Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK
⁴Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
⁵Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan
⁶Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan

* Presenter:Swapnil Milind Mhatre, email:swapnilmhatre801@gmail.com

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 high-quality long-chain organic diammonium spacer assisted 2D hybrid perovskite FA-(N-MPDA)PbBr₄ (FA = formamidinium and N-MPDA= N1-methylpropane-1,3-diammonium) by slow evaporation at a 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/cm² ) and a high-quality factor (∼5350). Furthermore, the 2D hybrid microrod lasers show 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.

Keywords: Random laser, 2D perovskites, Single crystal