Study of Amplified Spontaneous Emission in CsPbBr3 perovskite
Changsoon Cho a, Alexander Palatnik a, Markas Sudzius a, Frederik Nehm a, Karl Leo a
a IAPP (Institut fuer Angewandte Photophysik),, TU Dresden, 01062, Dresden,
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Poster, Changsoon Cho, 015
Publication date: 25th November 2019

Perovskites are showing great potential in lasing applications. We introduce our recent works on amplified spontaneous emission (ASE) characteristics of vacuum processed inorganic CsPbBr3 perovskite films. Under the pulsed (1.3 ns) excitation of >10 μJ/cm2, CsPbBr3 films show ASE in room temperature without any post-process or photonic structures. Among the various samples with different thicknesses, 80 nm-thick films have shown the highest ratio of ASE over photoluminescence (PL). The ASE peak was recorded at ~ 540 nm (FWHM: 2 nm), as opposed to a PL peak at 523 nm. Unlike other typical lasing materials, the ASE peak of our CsPbBr3 perovskite was shown to be red-shifted as excitation intensity increased under both femtosecond and nanosecond laser pulses. We describe ASE dynamics with our custom-made model and investigate parameters affecting ASE, including excitation area, energy band, temperature, and light scattering. In addition, we discuss several factors potentially influencing the ASE measurement.

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