Ultraviolet upconversion emissions around 314 nm from 6P J states of Gd3+ ions have been observed in Y 1.98 - xGdxHo0.02O3 (x = 0.02, 0.10, 0.20, and 0.30) oxide ceramics under the excitation of a continuous-wave 532-nm laser. We found that the energy transfer process from Ho3+ to Gd3+ plays an important role in populating the 6P J states of Gd3+. The doping of Gd3+ ions does not affect 5G4 and 5G5 states but only the 3D3 state of Ho3+. The emissions from 3D3 state decrease with the increase of Gd3+ concentration. Power dependence curves and time-resolved spectra have been measured to identify the proposed upconversion mechanism.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering