Achieving Optical Gain of the CsPbBr3 Perovskite Quantum Dots and Influence of the Variable Stripe Length Method
High-quality inorganic cesium lead halide perovskite quantum
dot (CsPbBr3 PQD) thin films were successfully deposited directly from a
powdered source and used as an active laser medium following the
examination of their distinctive surface and structural properties. To determine
the suitability of the CsPbBr3 PQDs as an active laser medium, amplified
spontaneous emission (ASE) and optical gain properties were investigated
under picosecond pulse excitation using the variable stripe length (VSL)
method. The thin film of CsPbBr3 PQDs has exhibited a sufficient value of the
optical absorption coefficient of ∼0.86 × 105 cm−1 near the band edge and a
direct band gap energy Eg ∼2.38 eV. The samples showed enhanced emission,
and ASE was successfully recorded at a low threshold. The light emitted from
the edge was observed near 2.40 and 2.33 eV for the stimulated emission (SE)
and ASE regimes, respectively. The nonradiative decay contributes excitons
dominant over biexcitons in the sample edge emission above the ASE threshold, making it practical for CsPbBr3 PQDs to be used as
optical gain media without undergoing repeated SE processes above the threshold over long periods. A high value of the optical gain
coefficient was recorded at 346 cm−1
.
In this study, we investigated the optoelectronic properties of cubic (Pm3m) and orthorhombic (Pnma) CsPbX3 (X = I, Br, and Cl). We utilized the full potential linear augmented plane wave method,…
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