Abstract
Excited by a 980 nm laser, upconversion emissions centered at 384 () and 408 nm () in codoped polycrystalline were successfully obtained. The and states of were verified to be thermally coupled levels, which can emit the shortest wavelength emissions for optical thermometry known so far. Based on the change of their intensity ratio with temperature, an excellent optical thermometer can be designed, which can provide accurate temperature measurement from room temperature up to 873 K. More importantly, the sensitivity achieved here is much higher than reported temperature sensors based on green luminescence.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Wei Xu, Qiutong Song, Longjiang Zheng, Zhiguo Zhang, and Wenwu Cao
Opt. Lett. 39(16) 4635-4638 (2014)
Leipeng Li, Longjiang Zheng, Wei Xu, Zhang Liang, Yuan Zhou, Zhiguo Zhang, and Wenwu Cao
Opt. Lett. 41(7) 1458-1461 (2016)
Wei Xu, Xiaoyang Gao, Longjiang Zheng, Zhiguo Zhang, and Wenwu Cao
Opt. Express 20(16) 18127-18137 (2012)