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Open Access Intense red upconversion emission and temperature sensing in Er3+/Yb3+ co-doped Ba5Gd8Zn4O21 phosphor

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Zincate Ba5Gd8Zn4O21 phosphors with various Er3+ and Yb3+ concentrations were prepared via a simple solid state reaction, and their crystal structures were examined by means of X-ray diffraction (XRD). Pumped by 980 nm, the zincate phosphors exhibit intense red upconversion emission corresponding to the 4F9/24I15/2 transition. Tested under the same condition, it was found that the upconversion emission of zincate phosphor was intenser than that of commercial Y2O3:Er3+/Yb3+ phosphor. Hence, it is believed that Ba5Gd8Zn4O21 is a favorable host material for high efficient upconversion luminescence. Based on the change of their intensities ratio of 2H11/2 and 4S3/2 emissions with temperature, the temperature sensing behavior of the phosphor was studied, in which the maximum sensor sensitivity was deduced to be 0.0024 K–1. Moreover, with the increase of temperature, the emission colors of the phosphor can be adjusted from red to yellow-green. Therefore, this phosphor may have potential application for temperature sensor as well as for warning function to ambient temperature.
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Keywords: BA5GD8ZN4O21:ER3+/YB3+ PHOSPHORS; LUMINESCENCE; SOLID STATE REACTION; TEMPERATURE SENSING; UPCONVERSION

Document Type: Research Article

Publication date: September 1, 2013

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