Highly efficient cyan-red emission in self-activated Sr9In(VO4)7:xEu3+phosphors for applications in W-LEDs and optical thermometry
JOURNAL OF ALLOYS AND COMPOUNDS(2024)
摘要
Optical thermometry based on fluorescence intensity ratio (FIR) has garnered much attention as it pushes beyond the limitations of traditional thermometers. Here, we present a new strategy for FIR thermometry using dual emissions from Sr9In(VO4)7:xEu3+ (SIVO:xEu3+) phosphors by a single activation. A series of color tunable SIVO: xEu3+ phosphors was successfully synthesized, and their luminescent properties were investigated. The phosphors emit broadband from VO43- groups as well as sharp emissions from Eu3+ ions upon ultraviolet excitation (320 nm) with high thermal stability and little to no concentration quenching of Eu3+. Meanwhile, the SIVO:0.8Eu3+ phosphor demonstrates a high quantum efficiency of 49%. The emitting color could be modulated from cyan to red via regulating the energy transfer efficiency from VO43- to Eu3+ ions by adjusting Eu3+con- centration. A prototype LED device based on SIVO:xEu3+ phosphors produces a bright white light with low color temperatures (2967-3741 K) and high color rendering indices (87-88.4%). Moreover, optical thermometry measurements using fluorescence intensity ratio of VO43- and Eu3+ emissions demonstrated optimum absolute sensitivity and relative sensitivity of 0.0975 K-1 and 1.26% K-1, respectively. Regulating the energy transfer between the host and activator proved to be a feasible strategy to modulate the emission color and achieve optical thermometry in a single-phase phosphor. The reported results also provide insights into designing multifunctional materials for both White -LED (W -LED) and thermometry applications.
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关键词
Tunable photoluminescence,Whitlockite-type vanadate,Energy transfer,Optical thermometry,W-LED
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