Abstract
Self-calibrated optical luminescent thermometers were prepared based on Eu3+/Mn2+ co-doped Zn2GeO4 phosphors with controllable morphology via a facile hydrothermal synthesis process. The co-doped concentration of Eu3+ ions in Zn2GeO4:Mn2+ played important roles in the evolution of the morphology and the formation of the dual luminescent emission mode. Depending on different excitation wavelengths ranging from 260 to 360 nm, the dual emission centers located at about 534 nm and 612 nm were ascribed to d-d transition derived from 4T1-6A1 of Mn2+ ions and f-f transition originated from 5D0-7F2 of Eu3+ ions, respectively, which gave rise to the excellent self-calibrating temperature sensing functions. The related luminescent and sensing mechanism of the Eu3+/Mn2+ co-doped Zn2GeO4 phosphors are also proposed. The as-obtained Eu3+/Mn2+ co-doped Zn2GeO4 phosphors had a high relative sensitivity (Sr) of 1.96% ºC−1 between 20 and 80 °C, as well as stable reusability, demonstrating its superiority as a ratiometric luminescent thermometer for temperature sensing applications.
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