Yb3+/Er3+ co-doped upconversion materials are widely used for luminescence intensity ratio (LIR)
thermometry, where the relative intensity ratio of the green luminescence transitions (2H11/2
4I15/2 and 4S3/2 4I15/2 ) of Er3+ dopant ions changes with temperature. In this work we
report on the impact of an additional transition from the 2H9/2 level to the intermediate 4I13/2
level, which overlaps with the green luminescence normally used for LIR thermometry. The
2H9/2 4I13/2 emission overlaps extensively with the 4S3/2 4I15/2 emission and is more sensitive
to pump power. The wavelength intervals used to integrate both 2H11/2 4I15/2 and 4S3/2 4I15/2
luminescence need be selected carefully in order to achieve accurate temperature readouts.
Published: June 18, 2021
Citation
Xia X., A. Volpi, J.D. Roh, M.C. De Siena, D.R. Gamelin, M.P. Hehlen, and P. Pauzauskie. 2021.The impact of 2H9/2 ->4I13/2 emission from Er3+ ions on ratiometric optical temperature sensing with Yb3+/Er3+ co-doped upconversion materials.Journal of Luminescence 236.PNNL-SA-160779.doi:10.1016/j.jlumin.2021.118006