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Inorganically Functionalized PbS–CdS Colloidal Nanocrystals: Integration into Amorphous Chalcogenide Glass and Luminescent Properties
journal contribution
posted on 2012-02-08, 00:00 authored by Maksym V. Kovalenko, Richard D. Schaller, Dorota Jarzab, Maria
A. Loi, Dmitri V. TalapinInorganic semiconductor nanocrystals (NCs) with bright,
stable,
and wavelength-tunable luminescence are very promising emitters for
various photonic and optoelectronic applications. Recently developed
strategies for inorganic surface capping of colloidal NCs using metal
chalcogenide complexes have opened new perspectives for their applications.
Here we report an all-inorganic surface functionalization of highly
luminescent IR-emitting PbS–CdS NCs and studies of their luminescence
properties. We show that inorganic capping allows simple low-temperature
encapsulation of inorganic NCs into a solution-cast IR-transparent
amorphous As2S3 matrix. The resulting all-inorganic
thin films feature stable IR luminescence in the telecommunication
wavelength region. The high optical dielectric constant of As2S3 also helps reduce the dielectric screening of
the radiating field inside the quantum dot, enabling fast radiative
recombination in PbS–CdS NCs.
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Amorphous Chalcogenide Glassoptoelectronic applicationsNC2S matrixluminescence propertiesIR luminescencequantum dotmetal chalcogenide complexestelecommunication wavelength regiondielectric screeningradiative recombinationPbSfilms featureLuminescent PropertiesInorganic semiconductor nanocrystalssurface
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