Efficient Dual Mode Emission in Ce3+/Yb3+/Er3+ Doped Yttrium Aluminium Gallium Garnet and Optical Thermometry

By utilizing the effective energy transfer from Ce 3+ to Yb 3+ , Er 3+ and from Yb 3+ to Er 3+ authors have achieved dual mode emission in Y 3 Al 4 GaO 12 activated with Ce 3+ /Yb 3+ /Er 3+ ions. The chemical state of the dopant ions was confirmed by the X-ray photoelectron spectroscopy (XPS). On excitation with 438 nm the prepared material has shown broad visible emission band around 511 nm due to the electronic transition of Ce 3+ ions. In addition to this sample has also shown NIR emission bands centered around 1024 nm and 1480 nm from Yb 3+ and Er 3+ ions, respectively. The emission band at 1024 nm could be due to the quantum cutting (QC) process. These emission bands take place owing to the energy transfer from Ce 3+ ions to Yb 3+ and Er 3+ ions, respectively. The energy transfer efficiency ( [[EQUATION]] from Ce 3+ ions to Yb 3+ -Er 3+ ions is found to be 27.30%. Furthermore, up-conversion (UC) emission spectra with the function of temperature and laser power were recorded under 980 nm excitation. The optical thermometry ability of the material was studied using luminescence intensity ratio of UC emission spectra. Studies suggest that the prepared material could be useful as dual mode emission phosphor