Optical temperature sensing properties of Stokes fluorescence-based high color-purity green-emitting Sr₂Gd₈(SiO₄)₆O₂:Er³⁺ phosphors

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Fluorescence intensity ratio (FIR)-based optical thermometry has attracted a great deal of attention because it allows accurate and reliable temperature measurements with high spatial resolution and real-time monitoring. Herein, we report the novel Sr<SUB>2</SUB>Gd<SUB>8</SUB>(SiO<SUB>4</SUB>)<SUB>6</SUB>O<SUB>2</SUB>:Er<SUP>3+</SUP> (SGSO:Er<SUP>3+</SUP>) phosphor as an optical thermometry material. The sol-gel method is used to synthesize the oxyapatite structured SGSO:Er<SUP>3+</SUP> phosphors, which exhibits a rod-like morphology. The photoluminescence spectra of SGSO:Er<SUP>3+</SUP> phosphors displays two distinct green emission bands corresponding to the electronic transitions <SUP>2</SUP>H<SUB>11/2</SUB> → <SUP>4</SUP>I<SUB>15/2</SUB> and <SUP>4</SUP>S<SUB>3/2</SUB> → <SUP>4</SUP>I<SUB>15/2</SUB>. The temperature-induced variations in the FIR result in a maximum sensitivity of 3.4 × 10<SUP>−3</SUP> K<SUP>−1</SUP> at 463 K. Further, the CIE chromaticity coordinates do not shift from the green region when the temperature is increased from 303 to 483 K and the color purity only decreasing from 77.6 to 71.4%. The SGSO:2Er<SUP>3+</SUP> phosphor exhibits the color-purity of 93.5% when excited with low-energy electron beam. These results suggest that the SGSO:2Er<SUP>3+</SUP> phosphor is a promising material for optical temperature sensors and display devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Green-emitting Sr<SUB>2</SUB>Gd<SUB>8</SUB>(SiO<SUB>4</SUB>)<SUB>6</SUB>:Er<SUP>3+</SUP> is reported as a novel multifunctional material. </LI> <LI> Sr<SUB>2</SUB>Gd<SUB>8</SUB>(SiO<SUB>4</SUB>)<SUB>6</SUB>:Er<SUP>3+</SUP> phosphor exhibits a maximum sensitivity of 3.4 × 10<SUP>−3</SUP> K<SUP>−1</SUP> at 463 K. </LI> <LI> Green color-purity destruction under elevated thermal condition is only about 6%. </LI> <LI> Under low electron-beam excitation, phosphor unveil 93.5% green color-purity. </LI> </UL> </P>