Abstract
A set of germanate garnet phosphors containing Tb3+ and Eu3+ were adequately synthesized using the high-temperature solid-state technique. The structural properties, photoluminescence characteristics, fluorescence lifetimes, and temperature-sensing capabilities of the phosphors were thoroughly investigated. X-ray diffraction confirms the crystalline structure of the phosphors, while photoluminescence spectra reveal a colour shift attributed to the transfer of energy from Tb3+ to Eu3+ as the concentration of Eu3+ increases. The phosphors excited by UV light display a transition in colour from green to yellow, and subsequently to red, which can be used as a colour tunable phosphor in white light-emitting diode (w-LED) applications. As a novel temperature sensing material, the maximum relative sensitivity of Ca3Sc2Ge3O12: Tb3+, Eu3+ phosphor is 0.1044 K–1 (298 K), highlighting its potential for applications in temperature sensing.
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