Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

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• 作者：Andreia Ruivo ; Suzana M. Andrade ; Jo茫o Rocha ; C茅sar A. T. Laia ; Fernando Pina
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 12, 2014
• 年：2014
• 卷：118
• 期：23
• 页码：12436-12442
• 全文大小：350K
• 年卷期：v.118,no.23(June 12, 2014)
• ISSN：1932-7455

文摘

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鈥損honon 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.