Long duration phosphor for a fiber-optic thermometer

Abstract

The intensity of afterglow phosphorescence and lifetime from the fiber-optic thermometer using long duration phosphor, SrAl₂O₄: Eu²⁺, Dy³⁺, have been evaluated. In the long phosphorescent sensor head, the intensity of afterglow phosphorescence increases greatly and linearly with the temperature ranging from 270 K to 320 K with the temperature coefficient of 1.3 %·K^-1. Temperature coefficient of the afterglow intensity is found to be more sensitive than that of PL lifetime.