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Title of Journal: J Mater Sci Mater Electron

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Abbravation: Journal of Materials Science: Materials in Electronics

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Springer US

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DOI

10.1007/s12013-016-0761-6

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1573-482X

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Enhanced frequency upconversion and noncolour tun

Authors: Mohd Azam Vineet Kumar Rai Pankaj Mishra
Publish Date: 2016/07/22
Volume: 27, Issue: 12, Pages: 12633-12641
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Abstract

TeO2–WO3–Pb3O4 glasses codoped with Er3+–Yb3+ ions have been prepared by melting and quenching process Judd–Ofelt analysis has been performed to calculate the various radiative parameters viz radiative lifetime branching ratio and stimulated emission crosssections by using the absorption spectra The nephelauxetic ratio bonding and covalency parameters have been determined to get the information about the nature of bonding between the rare earth ions and neighbouring oxygen atoms The near infrared NIR to visible frequency upconversion UC study upon excitations with 980 nm and 808 nm diode lasers has been performed The variations observed in the UC emission intensity arising from the Er3+ ions have been explained on the basis of efficient energy transfer Yb3+ → Er3+ ions and back energy transfer Er3+ → Yb3+ processes On codoping with Yb3+ ions the intensity of the UC emission bands observed in the codoped glass upon excitation at 980 nm has been enhanced by many folds and explained on the basis of the oscillator strengths UC emission crosssection and temporal evolution analysis No tuning in the colour emitted from the codoped glass upon excitation at 980 nm is reported The results suggested that the codoped glass may be suitable in making the NIR to visible upconverter and colour nontunable optical devicesAuthors are grateful to Science and Engineering Research Board SERB Department of Science and Technology DST New Delhi India for providing the financial assistant in the form of a research project EMR/2014/001273 One of the authors Mr Mohd Azam is also thankful to Indian School of Mines ISM Dhanbad for providing the fellowship

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