Preparation and Site Selective Luminescence of Eu3+ in Triclinic GdBO3

Low(temperature phase of GdBO3with triclinic form was prepared by Sol(Gel process, while only pseudo(vaterite form could be obtained from the conventional solid state reaction. The triclinic form will change to pseudo(vaterite structure when being heated at higher than 1000℃. Luminescence of the triclinic GdBO3:Eu indicated the existence of two different sites of the cations in the host, which were denoted as A and B in the work. Then site selective luminescence of the sample was investigated. The influences of concentration and temperature on the luminescence properties were reported. For high Eu3+concentration, a very strong interaction took place between the dopants. Emissions from the two sites were both strong and could not be separated. At low temperature and with a low concentration, selective luminescence from the two sites was obtained. Different energy transfer rates of site A→B and B→A were also observed.