Luminescence properties of CaMoO4 nanoparticles embedded borate composite glass

Bhimireddi, R and Jaschin, PW and Mishra, K and Ansari, AA (2021) Luminescence properties of CaMoO4 nanoparticles embedded borate composite glass. In: Journal of Solid State Chemistry, 302 .

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Abstract

Transparent glasses of the 1.2CaO�0.2MoO3�B2O3 system were fabricated using the conventional melt-quenching technique. The glasses were heat-treated above the glass transition temperature (Tg) to yielded nanocrystalline composites of CaMoO4 (CMO) and CaB2O4 (CBO). The structural characterization of as-quenched and heat-treated glasses corroborated the crystallites of CaMoO4 and CaB2O4 using powder X-ray diffraction (XRD) and Raman spectroscopy. The various morphologies of the samples were studied using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Optical transmittance spectrum for as-quenched glass shows, approximately, 77 transparency (uncorrected for the reflection losses) from 2600 �nm to 325 �nm with a lower cut-off wavelength at 324 �nm. The optical band gap (Eg) and refractive index (η) of the as-quenched transparent glass were found to be 3.43 �eV and 1.615, respectively. Room-temperature photoluminescence properties of the as-quenched and glass nanocrystal composites (GNC) exhibit broad blue emission with UV excitation wavelengths (using laser and Xe lamp). Such distribution of CMO crystallites of nano-dimensions embedded in borate glass matrix could be used for various PL applications. © 2021 Elsevier Inc.

Item Type:	Journal Article
Publication:	Journal of Solid State Chemistry
Publisher:	Academic Press Inc.
Additional Information:	The copyright for this article belongs to Academic Press Inc.
Keywords:	Crystallites; Energy gap; Glass; Glass transition; High resolution transmission electron microscopy; Laser excitation; Luminescence; Nanocrystals; Refractive index; Scanning electron microscopy; Ultraviolet lasers; Uranium metallography; Vanadium metallography, Cutoff wavelengths; Luminescence properties; Melt quenching techniques; Nanocrystalline composite; Optical transmittance spectrum; Powder X ray diffraction; Room-temperature photoluminescence; Structural characterization, Calcium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	09 Dec 2021 09:29
Last Modified:	09 Dec 2021 09:29
URI:	http://eprints.iisc.ac.in/id/eprint/69584

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