Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 123, Issue 2, Pages 667-670Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2006.10.002
Keywords
Er3+ doped Al2O3; optical temperature sensor; green up-conversion emissions; fluorescence intensity ratio
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Er (3+) doped Al2O3 has been prepared by a non-aqueous sol-gel method using aluminum isopropoxide as precursor, acetylacetone as chelating agent, nitric acid as catalyzer, and hydrated erbium nitrate as a dopant in an isopropanol environment. The fluorescence intensity ratio (FIR) of the green up-conversion emissions at the wavelengths of about 523 and 545 nm in the Er3+ doped Al2O3 was studied as a function of temperature over a wide temperature range of 295-773 K, using a 978 mit semiconductor laser diode (LD) as an excitation source. The maximum sensitivity and the temperature resolution derived form the FIR of the green up-conversion emissions are approximately 0.0052 K-1 and 0.3 K, respectively. It is demonstrated that the prototype optical high temperature sensor based on the FIR technique from the green up-conversion emissions in the Er 3, doped Al2O3 is promising for applications in high temperature measurement. (C) 2006 Elsevier B.V. All rights reserved.
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