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Issue 5, 2017
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Red emitting Eu:ZnO nanorods for highly sensitive fluorescence intensity ratio based optical thermometry

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Abstract

Here, we report the synthesis of Eu:ZnO nanorods by a hydrothermal method and their use as fluorescence intensity ratio (FIR) based optical temperature sensors. The as-prepared nanorods show band to band UV emission along with Eu3+ emissions accompanied by broad intense visible host defect related emissions under UV (355 nm) excitation, whereas only Eu3+ related emissions are observed under visible (532 nm) excitation. The emissions corresponding to 5D1, 5D07F1 and 5D1, 5D07F2 under 532 nm excitation are considered for FIR based temperature sensing as 5D1 and 5D0 bands are very close to each other and can possess a thermal equilibrium between them. The intensity ratio between these transitions follows a Boltzmann type distribution function. The sensitivity obtained by fitting the intensity ratio is very high (3013/T2 K−1 for 5D1, 5D07F2) as compared to the reported values for Eu3+ based sensors and can be applied in a wide range of temperatures (83–493 K). The sensitivity is highly influenced by the doping concentration of Eu, increases with doping up to a certain extent and then decreases.

Graphical abstract: Red emitting Eu:ZnO nanorods for highly sensitive fluorescence intensity ratio based optical thermometry

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Publication details

The article was received on 03 Oct 2016, accepted on 20 Dec 2016 and first published on 20 Dec 2016


Article type: Paper
DOI: 10.1039/C6TC04296A
J. Mater. Chem. C, 2017,5, 1074-1082

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    Red emitting Eu:ZnO nanorods for highly sensitive fluorescence intensity ratio based optical thermometry

    S. Senapati and K. K. Nanda, J. Mater. Chem. C, 2017, 5, 1074
    DOI: 10.1039/C6TC04296A

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