Abstract

The abnormal “roller coaster”-like thermal evolution of the ${\mathrm{Er}}^{3+}$ ion’s red photoluminescence (corresponding to the ${}^4{F}_{9/2}-{{}^{4}I}_{15/2}$ transition) in ${\mathrm{CaWO}}_4\text{:}{\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ phosphors is observed. This red emission suffers from a strong thermal quenching in the 293–573 K temperature range, followed by a sharp increase on further increasing the temperature. The mechanism behind this phenomenon is confirmed to be from the dynamic temperature-dependent multiple mechanisms imposed on the ${}^4{F}_{9/2}$ state. At relatively low temperatures, the two-photon upconversion mechanism plays a leading role while, with the increasing of temperature, the one-photon channel, ascribed to the thermal population from the lower ${}^4{I}_{9/2}$ state, gradually takes a dominant place.

© 2019 Optical Society of America

Optical thermometry based on the red upconversion fluorescence of Er³⁺ in CaWO₄:Yb³⁺/Er³⁺ polycrystalline powder

Leipeng Li, Longjiang Zheng, Wei Xu, Zhang Liang, Yuan Zhou, Zhiguo Zhang, and Wenwu Cao
Opt. Lett. 41(7) 1458-1461 (2016)

Wide-range ratiometric upconversion luminescence thermometry based on non-thermally coupled levels of Er in high-temperature cubic phase NaYF₄: Yb, Er

Raheel Ahmed Janjua, Umer Farooq, Rucheng Dai, Zhongping Wang, and Zengming Zhang
Opt. Lett. 44(19) 4678-4681 (2019)

Strategy for highly sensitive optical ratiometric temperature measurement

Leipeng Li, Feng Qin, Yangdong Zheng, and Zhiguo Zhang
Opt. Mater. Express 9(8) 3260-3267 (2019)

Excellent optical thermometry based on short-wavelength upconversion emissions in Er³⁺/Yb³⁺ codoped CaWO₄

Wei Xu, Zhiguo Zhang, and Wenwu Cao
Opt. Lett. 37(23) 4865-4867 (2012)

Steady-state and time-resolved upconversion photoluminescence in Yb³⁺-Er³⁺ co-doped transparent ceramics of YAG

Fei Tang, Haoqi Li, Kangzhen Tian, Jiqiang Ning, Honggang Ye, and Shijie Xu
Opt. Lett. 45(20) 5712-5715 (2020)