Synthesis of Tb3+-Yb3+ coactivated CeO2 phosphors for two-photon assisted quantum cutting applications
Journal
Chemical Physics Letters
Journal Volume
748
Date Issued
2020
Author(s)
Abstract
Rare earth co-activated CeO2 phosphors are synthesized via hydrothermal process. Tb3+ and Yb3+ ions are deliberately incorporated in CeO2 host to convert high-energy photons into two near infrared photons with low energy for quantum cutting applications. The observed broad excitation ranging from 260 to 300 nm is associated with f-d transitions of Tb3+ ions. A strong green emission at 540 nm for Tb3+ ions along with typical Yb3+ emission band ranging from 950 to 1100 nm are observed under UV excitation. The PL intensity of Tb3+ ions starts to reduce with increase in Yb3+ emission as Yb3+ concentration increased, indicating an efficient energy transfer from Tb3+ to Yb3+. Photoluminescence decay times of CeO2:Tb3+/Yb3+ phosphors show reduction in lifetime from 2.32 to 0.83 ms with elevation of Yb3+ concentration from 0 to 12.5 mol%. Obtained results reveal the suitability of present phosphors in near-infrared quantum cutting applications.
SDGs
Type
journal article