The emission rise time of BaY₂ZnO₅:Eu³⁺ for non-contact luminescence thermometry

Lanthanide-based luminescence thermometry, superior to conventional invasive thermometers, has evoked considerable interest in the field of temperature evaluation for practical applications. Herein, the emission rise time of the ⁵D₀ level in Eu³⁺ doped BaY₂ZnO₅ phosphor was verified to be temperature dependent in a wide range from 330 K to 510 K with a high sensitivity. It exhibited a tremendous decrease with temperature elevating, varying from 207 μs at 330 K to 16 μs at 510 K, and the absolute sensitivity was about −1.1 μs K⁻¹, while the highest relative sensitivity could reach 2.2% K⁻¹ at 490 K. Furthermore, the detailed mechanism was carefully discussed with the experimental data, and this strong temperature dependence was explained in terms of thermal quenching. These results indicate that the accurate temperature evaluation can be realized by singly monitoring the emission rise time of the ⁵D₀ state, and BaY₂ZnO₅:Eu³⁺ phosphor has the specific advantage of being applicable in luminescence thermometry. - Highlights: • The luminescence thermometry based on rise time is a reliable method. • The rise time of the ⁵D₀ state is temperature dependent in range of 330–510 K. • The highest relative sensitivity could reach 2.2% K⁻¹ at 490 K. • BaY₂ZnO₅:Eu³⁺ has advantage of being applicable in luminescence thermometry.