A fluorescence intensity ratio (FIR) thermometer based
on inorganic
luminescence materials is a new-type temperature sensor with potential
and significance. However, research based on single transition metal
ions dual-emission fluorescence ratio thermometer is very rare. Especially,
a FIR thermometer based on Mn2+ ions has never been reported.
Here, we successfully control the site-selective occupancy of Mn2+ ions in Li5Zn8Al5Ge9O36 by controlling the synthesis atmosphere conditions.
Mn2+ ions form [MnO4] tetrahedrons with a weak
crystal field and [MnO6] octahedrons with a strong crystal
field corresponding to synthesis atmospheres of N2 and
O2, respectively. In addition, a novel FIR thermometer
Mn2+-doped material Li5Zn8Al5Ge9O36:Mn2+ based on different
dependences of Mn2+ ions in different crystal fields on
temperature is prepared in 50%N2+50%O2 conditions.
The thermometer has high sensitivity in the range of 303–383 K
including absolute sensitivity (S
a) and
relative sensitivity (S
r) (the S
a maximum is 0.476 K–1 at
373 K and the Sr maximum is 8.489% K–1 at 323 K) with low uncertainty (lower 0.1 K). Our researches have
added a new and excellent member into optical thermometer materials
and provided a valuable reference for exploring a new ratiometric
optical thermometer.
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