Upconversion Luminescence and Temperature Sensing Properties of High Thermal Stabilized CaGdAlO4∶Er3+/Yb3+Phosphors
Obtaining non-contact optical temperature sensing materials with good thermal stability and luminescent properties is one of the current research hotspots.In this work,Er3+/Yb3+co doped CaGdAlO4∶Erx,Yb0.10(x=0.006,0.008,0.010,0.012,0.014)single-phase phosphors were prepared by high-temperature solid-state method.For CaGdAlO4:Erx,Yb0.10 powders with different Er3+doping concentrations,the particle sizes range from 0.6 μm to 4.2 μm.When the samples are under 980 nm laser excitation,there exists two emission bands in the 500～575 nm range and one emission band in the 630～690 nm.The two stronger green emission bands located at 528 and 550 nm,and they could be attributed to2H11/2→4I15/2 and 4S3/2→4I15/2 transitions,while the weaker red emission band at 663 nm could be attributed to4F9/2→4I15/2 transition of Er3+.The optimal upconversion luminescence intensity was obtained from CaGdAlO4∶Er0.010,Yb0.10.In the temperature range of 300～573 K,based on fluorescence intensity ratio FIR528/550 parameters,the absolute sensitivity SA increases from 44.4 ×10-4 K-1(@300 K)to 52.0 × 10-4 K-1(@445 K),and then decreases to 49.0 × 10-4 K-1(@573 K).The relative sensitivity SR decreases monotonically from 0.95 × 10-2 K-1(@300 K)to 0.27 × 10-2 K-1(@573 K).Furthermore,the heating-cooling cycling experiment shows that the thermal repeatability of temperature sensing for the phosphor is better than 98％o.The results demonstrate that CaGdAlO4∶ Er0.010,Yb0.10 phosphors have potential applications in the field of optical temperature sensing.
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