AI Article Synopsis
- High-quality thin films of cesium lead bromide (CsPbBr) perovskite quantum dots were created through spin-coating on glass substrates, with their structure analyzed by various advanced microscopy and spectroscopy techniques.
- The optical properties of these quantum dots were studied, revealing their potential as active lasing media when pumped with a pulsed laser, showing significant amplified spontaneous emission (ASE) at low energy thresholds.
- The CsPbBr quantum dot thin films demonstrated high optical gain and strong photoluminescence, suggesting their suitability for integration into on-chip coherent light sources in various applications.
Article Abstract
High-quality thin films were obtained directly by spin-coating glass substrates with suspensions of powdered cesium lead bromide (CsPbBr) perovskite quantum dots (PQDs). The structural properties of the films were characterized via transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) analysis, and atomic force microscopy (AFM). The crystal structure of the CsPbBr PQDs was unique. The optical behavior of the CsPbBr PQDs, including absorption and emission, was then investigated to determine the absorption coefficient and band gap of the material. The CsPbBr PQDs were evaluated as active lasing media and irradiated with a pulsed laser under ambient conditions. The PQDs were laser-active when subjected to optical pumping for pulse durations of 70-80 ps at 15 Hz. Amplified spontaneous emission (ASE) by the CsPbBr PQD thin films was observed, and a narrow ASE band (∼5 nm) was generated at a low threshold energy of 22.25 μJ cm. The estimated ASE threshold carrier density ( ) was ∼7.06 × 10 cm. Band-gap renormalization (BGR) was indicated by an ASE red shift and a BGR constant of ∼27.10 × 10 eV. A large optical absorption coefficient, photoluminescence (PL), and a substantial optical gain indicated that the CsPbBr PQD thin films could be embedded in a wide variety of cavity resonators to fabricate unique on-chip coherent light sources.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7689956 | PMC |
| http://dx.doi.org/10.1021/acsomega.0c04517 | DOI Listing |
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