Abstract
Inorganic 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 As(2)S(3) matrix. The resulting all-inorganic thin films feature stable IR luminescence in the telecommunication wavelength region. The high optical dielectric constant of As(2)S(3) also helps reduce the dielectric screening of the radiating field inside the quantum dot, enabling fast radiative recombination in PbS-CdS NCs.
Highlights
A-As2S3 is known as a low-loss optical waveguide material that is especially useful for IR applications
With an optical band gap of 2.25 eV,[10] As−S glasses are transparent from the NIR down to mid-IR cutoff wavelengths of ∼10 μm[11] while showing high refractive index (n = 2.4 at λ = 4.8 μm)[12] and good nonlinear optical properties
W et colloidal synthesis is known as a powerful methodology for producing highly monodisperse semiconductor nanocrystal (NC) quantum dots with superior optical properties.[1,2]
Summary
Functionalized PbS-CdS Colloidal Nanocrystals Kovalenko, Maksym V.; Schaller, Richard D.; Jarzab, Dorota; Loi, Maria A.; Talapin, Dmitri V. Citation for published version (APA): Kovalenko, M. Functionalized PbS-CdS Colloidal Nanocrystals: Integration into Amorphous Chalcogenide Glass and Luminescent Properties. More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverneamendment. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
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