Er3+/Yb3+-doped NaGdF4 crystal-implanted
fiber (CIF) is synthesized by the electrospinning technique, which
possesses excellent crystal dispersibility, glorious flexibility,
and high crystal utilization, realizing temperature sensing in complex
and harsh environments. The combination of main and auxiliary sensing
endows CIF with self-calibration functionality to realize accurate
temperature measurement. Serving as the main thermal response signal
for a noninvasive nanothermometer, the absolute and relative sensitivities
for effective green emissions are up to 0.446% K–1 at 423 K and 1.018% K–1 at 303 K, respectively.
Further, the introduction of a blue emission peak is to participate
in the thermal response as an auxiliary indicator to inspect the accuracy
of the main thermal sensing data where the absolute and relative sensitivities
reach 28.473 and 1.522% K–1 at 313 and 303 K, respectively.
The flexible CIF with cooperative response thermometry possesses a
broad prospect in nanodomain optical thermometers, which present extraordinary
potential in nondestructive temperature monitoring and flexible temperature
sensing elements.