Defect band enhanced Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Sr 2+ phosphor upconversion luminescence for multimode optical temperature measurement

The Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Sr 2+ phosphor has excellent upconversion luminescence. In addition, 4 F 9/2 / 4 I 9/2 , 2 H 11/2 / 4 S 3/2 and 2 H 11/2 / 4 F 9/2 optical temperature measurement exhibits accurate and stable temperature measurement performance.