Down-conversion from blue to near infrared (NIR) has been demonstrated in Tm3+-Yb3+ codoped Y2O3 transparent ceramics. Upon the 464-nm excitation, the energy transfer (ET) mechanisms consisted of the Tm3+ : 1G4→ 2Yb 3+ : 2F5/2 cooperative down-conversion and the phonon assisted Tm3+ : 1G4+Yb3+ : 2F7/2 → Tm3+ : 3H5 + Yb3+ : 2F5/2 cross relaxation. The low quantum yield of the latter process, together with the low absorption cross section of Tm3+ at 464 nm and the low quenching concentration of Yb3+ in the Y2O3 host, made the Yb3+ 1030-nm NIR emission too weak for practical application.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering