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Lewis CS, Liu H, Han J, et al. Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors. Nanoscale. 2016;8(4):2129-42doi: 10.1039/c5nr06697b.
Lewis, C. S., Liu, H., Han, J., Wang, L., Yue, S., Brennan, N. A., & Wong, S. S. (2016). Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors. Nanoscale, 8(4), 2129-42. https://doi.org/10.1039/c5nr06697b
Lewis, Crystal S, et al. "Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors." Nanoscale vol. 8,4 (2016): 2129-42. doi: https://doi.org/10.1039/c5nr06697b
Lewis CS, Liu H, Han J, Wang L, Yue S, Brennan NA, Wong SS. Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors. Nanoscale. 2016 Jan 28;8(4):2129-42. doi: 10.1039/c5nr06697b. PMID: 26725486.
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Nanoscale. 2016 Jan 28;8(4):2129-42. doi: 10.1039/c5nr06697b.

Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors.

Nanoscale

Crystal S Lewis, Haiqing Liu, Jinkyu Han, Lei Wang, Shiyu Yue, Nicholas A Brennan, Stanislaus S Wong

Affiliations

  1. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA. [email protected] [email protected].
  2. Condensed Matter of Physics and Materials Sciences Department, Brookhaven National Laboratory, Building 480, Upton, NY 11973, USA.
  3. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA. [email protected] [email protected] and Condensed Matter of Physics and Materials Sciences Department, Brookhaven National Laboratory, Building 480, Upton, NY 11973, USA.

PMID: 26725486 DOI: 10.1039/c5nr06697b

Abstract

We report on the synthesis and structural characterization of novel semiconducting heterostructures composed of cadmium selenide (CdSe) quantum dots (QDs) attached onto the surfaces of novel high-surface area, porous rare-earth-ion doped alkaline earth titanate micron-scale spherical motifs, i.e. both Eu-doped and Pr-doped CaTiO3, composed of constituent, component nanoparticles. These unique metal oxide perovskite building blocks were created by a multi-pronged synthetic strategy involving molten salt and hydrothermal protocols. Subsequently, optical characterization of these heterostructures indicated a clear behavioral dependence of charge transfer in these systems upon a number of parameters such as the nature of the dopant, the reaction temperature, and particle size. Specifically, 2.7 nm diameter ligand-functionalized CdSe QDs were anchored onto sub-micron sized CaTiO3-based spherical assemblies, prepared by molten salt protocols. We found that both the Pr- and Eu-doped CaTiO3 displayed pronounced PL emissions, with maximum intensities observed using optimized lanthanide concentrations of 0.2 mol% and 6 mol%, respectively. Analogous experiments were performed on Eu-doped BaTiO3 and SrTiO3 motifs, but CaTiO3 still performed as the most effective host material amongst the three perovskite systems tested. Moreover, the ligand-capped CdSe QD-doped CaTiO3 heterostructures exhibited effective charge transfer between the two individual constituent nanoscale components, an assertion corroborated by the corresponding quenching of their measured PL signals.

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