Normalized-lifetime thermal-lens method for the determination of luminescence quantum efficiency and thermo-optical coefficients: Application to Nd³⁺-doped glasses

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C. Jacinto,¹ S. L. Oliveira,¹ L. A. O. Nunes,¹ J. D. Myers,² M. J. Myers,² and T. Catunda¹
¹Instituto de Física de São Carlos, Universidade de São Paulo - USP, CEP 13560-970, São Carlos - SP, Brazil
²Kigre Inc., 100 Marshland Road, Hilton Head Island, South Carolina 29926, USA

Received 29 November 2005; published 14 March 2006

Wepresent a new method based on thermal lens (TL) techniqueto determine the fluorescence quantum efficiency, eta , and thermo-optical coefficientsof fluorescent materials. These parameters can be obtained from thelinear dependence of the TL signal with the experimental lifetimesof a set of samples with different luminescent ion concentrations.The method was applied in Nd³⁺-doped materials (Q-98 Phosphate, fluorozirconate,and fluoroindate). The obtained values are in agreement with thosedetermined by other approaches based on TL methods and theratio between experimental and radiative lifetime values (Judd-Ofelt theory). Themethod hereafter presented is very simple and does not requirecomparison with a reference sample or the use of multipleexcitation wavelengths. In addition, the nature of concentration quenching takinginto account the achieved eta and tau values and respectiveenergy transfer microparameters, is discussed.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.125107
DOI:	10.1103/PhysRevB.73.125107
PACS:	78.20.Nv; 78.55.-m; 78.90.+t; 78.60.-b 78.20.Nv Thermooptical and photothermal effects (bulk materials/thin films) 78.55.-m Photoluminescence, properties and materials (condensed matter) 78.90.+t Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter (restricted to new topics in section 78) 78.60.-b Other luminescence and radiative recombination (condensed matter) YEAR: 2006
KEYWORDS:	neodymium compounds, fluoride glasses, Judd-Ofelt theory, fluorescence, thermal lensing, excited states, radiation quenching

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