Red emitting Ba2LaNbO6: Mn4+ phosphor for the lifetime-based optical thermometry
Wei-Hao Wang, Quanfeng Li, Liyan Chen, Yanhui Wang, Rubing Zhong, Huiwan Dong, Yijun Qiu, Y. Hu, Xiulian Zhang
Abstract
The Ba 2 LaNbO 6 : Mn4+ phosphor is synthesized through high-temperature solid-state method and characterized its crystal structure through X-ray powder diffraction. The value of D q , the Racah parameters B and C , and the nephelauxetic effect parameter β 1 of Ba 2 LaNbO 6 : Mn4+ have been calculated by its luminescent spectra. The temperature-dependent spectra of Mn4+ emission illustrated the thermal quenching of Ba 2 LaNbO 6 : Mn4+ phosphors. Additionally, the fluorescence lifetime-based optical temperature measurement value has been analyzed. According to the work, the maximum S a value is 0.0024 msK-1 at 354 K and the maximum S r is 2.77 %K-1 at 397 K. These results proved that the Ba 2 LaNbO 6 : Mn4+ phosphor has prospective potential in optical thermometry.