Facile synthesis and optical properties of colloidal quantum dots/ZnO composite optical resonators

Colloidal quantum dots (CQDs) can potentially enable new classes of highly flexible, spectrally tunable lasers processible from solutions. Despite a considerable progress over the past years, colloidal-QD lasing is still an important challenge. We report vertical tubular zinc oxide (VT-ZnO) and lasing based on VT-ZnO/CsPb(Br0.5Cl0.5)3 CQDs composite. Due to regular hexagonal structure and smooth surface of VT-ZnO, the light emitted at around 525 nm is effectively modulated under 325 nm continuous excitation. The VT-ZnO/ CQDs composite finally shows lasing with a threshold of ∼ 46.9 µJ.cm-2 and a Q factor of ∼ 2978 under 400 nm femtosecond (fs) excitation. This ZnO based cavity can be complexed with CQDs easily, which may pave a new way of colloidal-QD lasing.

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Facile synthesis and optical properties of colloidal quantum dots/ZnO composite optical resonators

Abstract: We present a facile method of incorporating CdSe/ZnxCd1−xS CQDs onto the surface of a ZnO WGM optical microcavity. The whispering gallery mode emission of the CQDs induced by the ZnO microcavity is directly observed.

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References 39 publications

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Vertical tubular zinc oxide microcavity enables efficient colloidal quantum dot lasing

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