Abstract
-doped solid-solution (SS) phosphors were fabricated to explore their possible application in fluorescence lifetime-based temperature sensing. The present samples exhibited R-line emissions associated with phonon sideband emissions of in the wavelength range of 600–850 nm upon the excitation of visible light. Through modifying the Al/Ga ratio in the SS hosts, the crystal field was easily tuned from intermediate to strong, being beneficial to modulate an energy gap between and thermally coupled emitting states. As a result, linearly temperature-sensitive fluorescence lifetime was achieved in the -doped SSs with a high Al/Ga ratio, enabling us to conveniently and accurately determine a temperature with a high relative sensitivity of .
© 2017 Optical Society of America
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