Temperature Dependence of the Amplified Spontaneous Emission from CsPbBr₃ Nanocrystal Thin Films

Abstract

Cesius lead halide perovskite colloidal nanocrystals are among the most promising perovskite systems for light emitting devices applications, due to their high fluorescence quantum yield and high optical gain at room temperature. In this Letter, we report on the first investigation of the temperature dependence of the Amplified Spontaneous Emission (ASE) properties of thin films of CsPbBr 3 nanocrystals. We demonstrate that ASE is strongly temperature dependent, with a complex variation in temperature of the ASE intensity, threshold, and peak wavelength. The joint investigation of the photoluminescence (PL) spectra below and above the ASE threshold allows us to conclude that the temperature increase results in the formation of disordered sub-domains emitting in the low energy tail of the PL spectra, leading to the existence of three emission regimes with transitions at about 90 K and about 170 K, with individually different temperature dependences.

Hybridization of CsPbBr3 Perovskite Nanocrystals with Polymer Nanofiber to Improve their Luminescence Stability

“…To further explore the luminescence mechanism of CsPbBr 3 ‐ES, temperature‐dependent photoluminescence spectra were recorded at temperatures ranging from 80 to 298 K. As shown in Figure a, with an increase of temperature, the emission peak of CsPbBr 3 ‐ES showed a continuous blueshift and the corresponding emission intensity becomes weaker . This phenomenon was also observed from other semiconductors such as CH 3 NH 3 PbX 3 quantum dots , .…”

Recent Progress in Metal Halide Perovskite Micro‐ and Nanolasers

“…Recently, temperature‐dependent PL/lasing spectra and related carrier dynamics have been actively investigated . For instance, Balena et al reported the temperature‐related ASE properties in CsPbBr 3 QDs thin films . The result shows that ASE in QDs was strongly temperature‐dependent, with a complex variation in temperature of the ASE intensity, threshold, and wavelength.…”

Ultrastable CsPbBr3 Perovskite Quantum Dot and Their Enhanced Amplified Spontaneous Emission by Surface Ligand Modification

“…Jun Pan et al has reported the ASE threshold of the CsPbBr 3 thin films to be 192 and 12 mJ cm −2 under single‐photon and two‐photon pump laser, respectively . Besides, a series of studies were performed to further reduce the ASE or lasing threshold of the CsPbBr 3 QDs thin films …”