Shasmal, Nilanjana and Karmakar, Basudeb (2016) Enhancement and tuning of photoluminescence properties in Pr3+/Au co-doped antimony oxide glass nanocomposites by thermal treatment. Journal of Alloys and Compounds, 688 (B). pp. 313-322. ISSN 0925-8388

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Pr3+/Au3+ co-doped antimony oxide glass nanocomposites has been synthesized in a dielectric glass matrix having composition 15K(2)O-15B(2)O(3)-60Sb(2)O(3)-10ZnO (KBSZ) by single-step melt-quenching technique. Au nanoparticles (NPs) are generated in-situ by thermochemical reduction by Sb3+. The Tg has been found to be 290-295 degrees C as obtained by dilatometry and differential scanning calorimetry. X-ray diffraction (XRD) patterns show the presence of nanocrystalline phase of Au in the as-prepared samples. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) patterns also confirm the presence of Au NPs. UV-Vis absorption spectra shows both the characteristic absorption bands of Pr3+, around 445 nm and Au surface plasmon resonance (SPR), around 620 nm. When excited with 447 nm diode laser, all the nanocomposites show strong orange emissions. The sample containing 0.008 wt% Au gives the maximum emission. This sample is heat treated at 300 degrees C for different durations. XRD of heat treated samples reveals that crystallization of the glassy matrix initiates at around 480 min heat treatment. The UV-Vis absorption spectra of the heat treated samples show increased absorbance of the SPR band of Au around 620 nm. The SPR band of Au gets more and more widespread with increasing heat treatment duration which is due to rapid rate of Au NP generation by thermochemical reduction at elevated temperature. Variation of PL intensity with heat treatment duration exhibits two maxima (at 45 and 480 min durations). The first one is due to the attainment of the critical size of Au NPs, for which the emission becomes maximum. And the second one is the effect of matrix crystallization, which lowers down the phonon energy of the system and enhances PL intensity by reducing the nonradiative loss. This enhancement and tuning of photoluminescence is enormously useful for various photonic applications. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 02 Dec 2016 07:20
Last Modified: 02 Dec 2016 07:20

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