The development of new temperature-dependent phosphor particles for high temperature thermometry is presented. To develop the phosphor material that can be applied to the intensity ratio method, the photoluminescence of Y_2O_3:Tb,Tm was investigated with elevating temperature. As a result, Y_2O_3:Tb,Tm phosphor shows that the peak intensity at 456 nm is still strong at more than 1100 K whereas the other peak intensities decrease due to the thermal quenching. Thus, the intensity ratio I_(543nm)/I_(456nm) has a high gradient and linearity over a wide temperature range, and it is confirmed that Y_2O_3:Tb,Tm provides a higher resolution in temperature measurement than Y_2O_3:Tb and Y_2O_3:Tm. Also, since this phosphor changes its emission color from green to blue with increasing temperature, it is possible to measure temperature not only by analyzing the intensity ratio but also by observing the color change in appearance. It can, therefore, be expected to use as a Visual Thermo-Sensor (VTS).
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