| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1529135 | Materials Science and Engineering: B | 2011 | 4 Pages |
Near-infrared (NIR) quantum cutting luminescent materials Li2TeO4 doped with Pr3+ and Yb3+ were synthesized by solid-state reaction method. The dependence of Yb3+ doping concentration on the visible- and NIR-emissions, decay lifetime, and quantum efficiencies of the phosphors are investigated. Quantum cutting down-conversion involving 647 nm red emission and 960–1050 nm broadband near-infrared emission for each 487 nm blue photon absorbed is realized successfully in the resulting phosphors, of which the process of near-infrared quantum cutting could be expressed as 3P0(Pr3+) → 2F5/2(Yb3+) + 2F5/2(Yb3+). The maximum quantum cutting efficiency approaches up to 166.4% in Li2TeO4: 0.3 mol%Pr3+, 1.8 mol%Yb3+ sample corresponding to the 66.4% value of energy transfer efficiency.
► We synthesize near-infrared quantum cutting Li2TeO4: Pr3+, Yb3+ phosphors. ► We investigate the photoluminescence properties on the dependence of Yb3+ doping concentration. ► We assume a cooperative downconversion route for this energy transfer efficiency. ► We calculate the maximum quantum cutting efficiency approaches up to 166.4%.
