Abstract
A series of K0.3Bi0.7F2.4:Eu3+@xg-C3N4 composites were synthesized via use of a typical self-assembly method so as to obtain highly-efficient thermosensitive materials. The phase structure, morphology, light harvest ability, thermal stability and luminescence properties of the final compounds were studied. Under 393 nm irradiation, the featured emissions of g-C3N4 and Eu3+ arising from K0.3Bi0.7F2.4:Eu3+ nanoparticles are simultaneously obtained in the prepared composites. Through adjusting the g-C3N4 content, color-tunable emissions from white to cyan are realized in the resultant composites. Furthermore, via use of the fluorescence intensity ratio (i.e., FIR) technology to analyze the temperature-dependent emission intensities of g-C3N4 and K0.3Bi0.7F2.4:Eu3+ NPs, the thermometric behaviors of K0.3Bi0.7F2.4:Eu3+@xg-C3N4 composites are investigated. It is found that the sensitivities of the developed composites are able to be tuned via manipulating the g-C3N4 content. In particular, the maximum relative and absolute sensitivities of K0.3Bi0.7F2.4:Eu3+@1.5%g-C3N4 composites are 2.127% K−1 and 0.004 K-1, respectively. These final results demonstrate that K0.3Bi0.7F2.4:Eu3+@xg-C3N4 composites with multicolor emissions and good temperature sensing properties are promising luminescent candidates for optical thermometers.
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