%0 Journal Article
%T Fluorescence intensity ratio technique and its reliability.
%A Kesarwani V
%A Rai VK
%A Kesarwani V
%A Rai VK
%J Methods Appl Fluoresc
%V 10
%N 3
%D May 2022 26
%M 35580603
%F 3.849
%R 10.1088/2050-6120/ac70ab
%X The present article reports the optical absorption and upconversion (UC) studies of 1.0 mol% Er3+/2.0 mol% Yb3+doped/codoped glasses prepared by melt-quenching technique. The elements present and the composition of the prepared glass have been confirmed from XPS and XRF analysis respectively. Judd-Ofelt intensity parameters have been calculated using the absorption spectrum which is further utilized to predict the nature of Er_O bond, the transition probabilities, branching ratios and radiative lifetimes. The CIE study shows non-colour tunable and highly pure green emission (94.2%). The temperature-dependent UC emission spectra of the 2.0 mol% Yb3+sensitized glass have been recorded at three different pump power densities to establish a reliable FIR based temperature scale. Furthermore, the Arrhenius fitting of the temperature-dependent spectra reveals low thermal quenching of green luminescence in the codoped glass.