Perovskite Quantum Dots Lasing in Double-Heterostructure through Energy Transfer.
basic_science · Level V
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- Record sourced from PubMed, PMID 38739874.
- Also identified by DOI 10.1021/acs.nanolett.4c00598.
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Abstract
Planar double heterostructures were initially investigated and have been successfully applied in III-V semiconductor lasers due to their excellent roles in confining both the photons and carriers. Here, we design and fabricate a (PEA)<sub>2</sub>Cs<sub><i>n</i>-1</sub>Pb<sub><i>n</i></sub>X<sub>3<i>n</i>+1</sub> (quasi-2D)/CsPbBr<sub>3</sub> QD/quasi-2D double-heterostructure sandwiched in a 3/2 λ DBR microcavity, and then demonstrate a single-mode pure-green lasing with a threshold of 53.7 μJ/cm<sup>2</sup> under nanosecond-pulsed optical pumping. The thresholds of these heterostructure devices decrease statistically by about 50% compared to the control group with no energy donor layers, PMMA/QD/PMMA in an identical microcavity. We show that there is efficient energy transfer from the barrier regions of the quasi-2D phases to the QD layer by transient absorption and luminescence lifetime spectra and that such energy transfer leads to marked threshold reduction. This work indicates that the double-heterostructure configurations should play a significant role in the future perovskite electrically pumped laser.