NaYbF4@NaYF4 as near infrared light excited inorganic optical sensors for oxygen-undisturbed temperature detecting
The luminescence and temperature response characteristics of NaYF4 containing 15% NaYBF4 were investigated. NaYbF4@NaYF4 has good thermal stability and excellent response characteristics in the temperature in the range from 300 to 500 K, which significantly increases the upper limit of temperature detection of ytterbium temperature sensor. A self-calibration relationship between the reciprocal of temperature and the natural logarithm ratio of luminescent intensity has been discovered.