Fabry-Perot Mode-Limited High-Purcell-Enhanced Spontaneous Emission from <i>In Situ</i> Laser-Induced CsPbBr<sub>3</sub> Quantum Dots in CsPb<sub>2</sub>Br<sub>5</sub> Microcavities.
basic_science · Level V
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- Record sourced from PubMed, PMID 34941275.
- Also identified by DOI 10.1021/acs.nanolett.1c04025.
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Abstract
The patterned metal halide perovskites exhibit novel photophysical properties and high performance in photonic applications. Here, we show that a UV continuous wave laser can induce <i>in situ</i> crystallization of individual and patterned CsPbBr<sub>3</sub> quantum dots (QDs) inside the CsPb<sub>2</sub>Br<sub>5</sub> microplatelets. The microplatelet acts as a natural Fabry-Perot cavity and causes the high-Purcell-effect-enhanced (by 287 times) cavity mode spontaneous emission of the embedded CsPbBr<sub>3</sub> QDs. The luminescence exhibits a superlinear emission intensity-excitation intensity relation <i>I</i>(<i>p</i>) ∝ <i>p</i><sup>2.83</sup>, and the exponent is much bigger than that of the free-space exciton spontaneous emission, suggesting arising of stimulated emission at higher photon concentrations. These laser-driven crystallized and patterned cavity mode luminescent perovskite QDs in a waterproof wider-bandgap perovskite microcavity act as an ideal platform for studying the cavity quantum electrodynamics phenomena and for applications in information storage and encryption, anticounterfeiting, and low-threshold lasers.