Temperature sensing technique across a wide range using phosphorescence intensity ratio of Dy3+-Doped YAG/YAP

To address the need for precise temperature measurement across an extended temperature range, we successfully synthesized a temperature-sensitive phosphorescent material using a high-temperature solid-state method. This material involves the incorporation of dysprosium dopant into the yttrium aluminum garnet/yttrium aluminum perovskite (YAG/YAP) phosphor matrix. Our primary objective was to leverage the phosphorescence intensity ratio of Dy3+ energy level transitions (4F9/2 -> 6H15/2, 4I15/2 -> 6H15/2) in response to temperature fluctuations, enabling temperature measurements within the 100-1300 degrees C range. Throughout our investigation, we observed shifts in the peak wavelengths "a" and "b" attributable to thermally coupled energy level transitions as temperature increased. Specifically, at 1000 degrees C, the peak wavelength "a" shifted from 457.4 nm to 457.8 nm, while at 750 degrees C, peak wavelength "b" shifted from 497.6 nm to 497.2 nm. Subsequently, we assessed the temperature sensitivity and measurement error of the sample. Impressively, the temperature sensitivity remained consistent across various single-pulse excitation powers and even after 50 h of continuous operation. The maximum absolute sensitivity exceeded 11.21 x 10-4 degrees C- 1, and the relative sensitivity surpassed 2.78 x 10-2 %degrees C- 1. The minimum temperature measurement error was approximately +/- 2 degrees C. As a result, the phosphorescent YAG/YAP: Dy3+ powder demonstrates significant potential for applications within the 100-1300 degrees C temperature range.