Yb3+/Er3+ co-doped CaMoO4: a promising green upconversion phosphor for optical temperature sensing

Abstract In this work, Er3+/Yb3+:CaMoO4 upconversion phosphor is fabricated, and its temperature dependent luminescent performance is investigated. Using fluorescence intensity ratio of the Er3+ 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 emissions in CaMoO4 as thermometric index, the temperature sensitivity is found to be above 0.0095 K−1 in the whole temperature range of 303–873 K, while the maximum value reaches as high as 0.0143 K−1 at 573 K, revealing this phosphor to be a very promising optical temperature sensing material.