Signature of Lasing and Polarized Emission from CsPbBr3 Quantum Dots

ORAL

Abstract

A comparative study of quantum confined cesium lead halide pervoskite (CsPbBr3) nanocrystals is carried out. Quantum dots having size 5.5 nm reveal stimulated emission at low temperature for excitation fluence as low as ~4.16 µW (Xe lamp excitation). Moreover, about 48% linear polarized emission is also observed in the colloidal solution besides 95 % photoluminescence (PL) quantum yield at room temperature. Even though, CsPbBr3 quantum dots reveal the red shift in band gap at low temperature, similar to the single crystal, the exciton-phonon interaction is profoundly affected by the quantum size effects. Temperature dependent optical studies reveal an anomalous decrease in exciton-LO phonon coupling in small sized quantum dots aside from expected higher exciton binding energy. Observed stimulated emission in low sized CsPbBr3 quantum dots has implications in realizing quantum dot based laser.

Presenters

  • Shailaja Mahamuni

    Department of Physics, S.P. Pune University

Authors

  • Shailaja Mahamuni

    Department of Physics, S.P. Pune University

  • Richa Gahlaut

    Department of Physics, S.P. Pune University

  • Aparna Shinde

    Department of Physics, S.P. Pune University