The impact of Eu3+ concentration on charge transfer and f-f transitions in KLa1−xEuxP4O12 nanocrystals

The spectroscopic properties KLa1−xEuxP4O12 nanocrystals were investigated. Time-resolved and steady-state emission spectra were recorded. The excitation spectra measurements reveal decreasing of the charge transfer band intensity with Eu3+ concentration. This effect is due to the concentration quenching of the charge transfer emission intensity due to the overlap of the CT state and the f-f transitions of Eu3+ ions. The influence of Eu3+ concentration on the kinetics of 5D0, 5D1 and CT states was investigated.