Jagannath, G and Eraiah, B and Jayanthi, K and Keshri, Shweta Rani and Som, Sudipta and Vinitha, G and Pramod, A G and Krishnakanth, K N and Devarajulu, G and Balaji, Sathravada and Rao, S Venugopal and Annapurna, K and Das, Subrata and Allu, Amarnath R (2020) Influence of gold nanoparticles on the nonlinear optical and photoluminescence properties of Eu2O3 doped alkali borate glasses. Physical Chemistry Chemical Physics, 22 (4). pp. 2019-2032. ISSN 1463-9076

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Abstract

Alkali borate glasses activated with trivalent europium ions and rooted with gold (Au) nanoparticles (NPs) were synthesised through a melt quenching process involving a selective thermochemical reduction and their applicability as photonic materials was assessed in detail. Non-linear optical (NLO) measurements were performed using a Z-scan approach in the wavelength range of 700-1000 nm. The open aperture Z-scan signatures for the Eu3+-containing glasses embedded with and without the Au NPs established a reverse saturable absorption (RSA) at all of the studied wavelengths ascribed to the two-photon absorption (2PA). Surprisingly, the nonlinear optical absorption switched to a saturable absorption (SA) with an increase in the concentration of AuCl3. With the incorporation of the Au NPs, the UV excited photoluminescence (PL) intensity of the Eu3+-doped glasses increased first as a consequence of the local field enhancement by the Au NPs, and subsequently decreased at a higher concentration of AuCl3 due to the reverse energy transfer from the Eu3+ ion to the Au-0 NPs. The electronic polarization effect of the host glass enhanced the D-5(0) -> F-7(4) transition intensity on the incorporation of the gold NPs owing to the gold NP-embedded glasses showing a deep-red emission. The NLO and PL studies suggested that the investigated glasses containing a 0.01 mol% of AuCl3 is practically appropriate for photonic applications.

Item Type:	Article
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	08 Feb 2021 09:34
Last Modified:	08 Feb 2021 09:34
URI:	http://cgcri.csircentral.net/id/eprint/4971

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