In:
Small, Wiley, Vol. 18, No. 11 ( 2022-03)
Kurzfassung:
The integration of highly luminescent CsPbBr 3 quantum dots on nanowire waveguides has enormous potential applications in nanophotonics, optical sensing, and quantum communications. On the other hand, CsPb 2 Br 5 nanowires have also attracted a lot of attention due to their unique water stability and controversial luminescent property. Here, the growth of CsPbBr 3 nanocrystals on CsPb 2 Br 5 nanowires is reported first by simply immersing CsPbBr 3 powder into pure water, CsPbBr 3− γ X γ (X = Cl, I) nanocrystals on CsPb 2 Br 5 −γ X γ nanowires are then synthesized for tunable light sources. Systematic structure and morphology studies, including in situ monitoring, reveal that CsPbBr 3 powder is first converted to CsPb 2 Br 5 microplatelets in water, followed by morphological transformation from CsPb 2 Br 5 microplatelets to nanowires, which is a kinetic dissolution–recrystallization process controlled by electrolytic dissociation and supersaturation of CsPb 2 Br 5 . CsPbBr 3 nanocrystals are spontaneously formed on CsPb 2 Br 5 nanowires when nanowires are collected from the aqueous solution. Raman spectroscopy, combined photoluminescence, and SEM imaging confirm that the bright emission originates from CsPbBr 3 −γ X γ nanocrystals while CsPb 2 Br 5 −γ X γ nanowires are transparent waveguides. The intimate integration of nanoscale light sources with a nanowire waveguide is demonstrated through the observation of the wave guiding of light from nanocrystals and Fabry–Perot interference modes of the nanowire cavity.
Materialart:
Online-Ressource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202105009
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2022
ZDB Id:
2168935-0
