Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.329
Publication date: 7th February 2022
Lead halide perovskites (LHPs) have emerged as one of the most important class of materials for potential optoelectronics. Creative choice of ‘A’ site cation leads to the realization of structures having intriguing properties. LHPs with reduced dimensionality exhibit a strong light-matter interaction due to stronger quantum and dielectric confinements. We have investigated linear and non-linear optical properties in face-shared one-dimensional pyridinium lead iodide (PyPbI3) single crystals. An efficient third-harmonic generation (THG) with a high laser-induced damage threshold (LIDT) is the highlight of this system. We observe a selective enhancement in THG for excitation at optical communication wavelength (~1.5 microns) corresponding to bandgap resonance. Strong exciton-phonon interaction results in highly Stokes-shifted self-trapped excitonic (STE) emission at the temperature range of 5-300 K. Temperature-dependent photoluminescence (PL) study reveals an interplay between anharmonicity and dynamic disorder leading to complex emission properties, which gets further complicated by a phase transition at 170 K. Our results shed light on the fundamental physics behind the complex carrier recombination process and provide an encouraging beginning to exploring similar 1D metal halides for potential application in non-linear optical photonic devices.
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