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Enhanced infrared to visible upconversion emission in er 3 doped phosphate glass: role of silver nanoparticles

Amjad, Raja Junaid and Sahar, Md. Rahim and Ghoshal, Sib Krishna and Dousti, Mohammad Reza and Riaz, Saira and Tahir, B. A. (2012) Enhanced infrared to visible upconversion emission in er 3 doped phosphate glass: role of silver nanoparticles. Journal of Luminescence, 132 (10). pp. 2714-2718. ISSN 0022-2313

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Official URL: http://dx.doi.org/10.1016/j.jlumin.2012.05.008

Abstract

Phosphate glasses with compositions (59.5–x)P2O5–MgO–xAgCl–0.5Er2O3 (0.0≤x≤1.5 mol%) containing fixed concentration of Er3+ ion with and without silver nanoparticles (NPs) are prepared using melt quenching technique. The amorphous nature of the glass is confirmed using the X-ray diffraction method. The homogeneous distribution of spherical Ag NPs (average size ∼37 nm) in the glassy matrix is evidenced from the transmission electron microscopy (TEM) analyses. The UV–vis–NIR absorption spectra shows 10 bands corresponding to 4I13/2, 4I11/2, 4I9/2, 4F9/2, 4S3/2, 2H11/2, 4F7/2, 4F5/2, 2G9/2, 4G11/2 transitions in which the most intense bands are 2H11/2 and 4G11/2. The absorption spectrum of Er3+ ions free glass sample containing Ag NPs displays a prominent surface Plasmon resonance (SPR) band located at 528 nm. The infrared to visible frequency upconversion (UC) emission under 797 nm excitation shows two emission bands green (4S3/2–4I15/2) and red (4F9/2–4I15/2) centered at 540 nm and 634 nm, respectively, corresponding to Er3+ transitions. An enhancement in UC emission intensity of green band (4S3/2–4I15/2) is observed in the presence of silver NPs and the maximum enhancement occurred for 1.5 mol% AgCl. However, the enhancement of emission intensity of the red band (4F9/2–4I15/2) is smaller. The enhancement of UC emission is understood in terms of the intensified local field effect due to silver NPs.

Item Type:Article
Uncontrolled Keywords:Luminescence
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:46925
Deposited By: Haliza Zainal
Deposited On:22 Jun 2015 13:56
Last Modified:27 Sep 2017 09:26

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