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http://hdl.handle.net/10773/20776
Title: | Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass |
Author: | Ruivo, Andreia Andrade, Suzana M. Rocha, Joao Laia, Cesar A. T. Pina, Fernando |
Keywords: | HALIDE PHOTOCHROMIC-GLASSES SILICATE-GLASSES ELECTRON-TRANSFER BORATE GLASSES RAMAN LUMINESCENCE MELTS MECHANISM SPECTROSCOPY CRYSTALS |
Issue Date: | 2014 |
Publisher: | AMER CHEMICAL SOC |
Abstract: | A multicomponent aluminoborosilicate photoluminescent glass was synthesized by introducing Pb(II) and NaBr in its composition. The room-temperature photoluminescence is due to the existence of 4 nm nanocrystals, shown using TEM imaging and XRD analysis, which are assigned to PbBr2 nanocrystals. The glasses display a broad emission band with a peak at 2.85 eV by exciting at 3.35 eV, with an anisotropy equal to 0.19 at room temperature. At 77 K, the emission intensity increases 1 order of magnitude and a vibronic structure appears, indicating an electron-phonon coupling with the glass matrix. Time-resolved luminescence measurements of these nanocrystals reveal mixed-order kinetics, with second-order recombination of self-trapped electron centers and a first-order temperature-dependent nonradiative rate constant connected with pathways due to confinement of self-trapped centers. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20776 |
DOI: | 10.1021/jp5003758 |
ISSN: | 1932-7447 |
Publisher Version: | 10.1021/jp5003758 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass_10.1021jp5003758.pdf | 277.25 kB | Adobe PDF |
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