Phase transition, structural and spectroscopic properties of Ba3Y(BO3)3 phosphor

Eu3+-doped Ba3Y(BO3)(3) phosphors were synthesized by high temperature solid-state reaction. This study emphasizes the microstructural and spectroscopic properties of Eu3+ doped Ba3Y(BO3)(3) phosphors. Two different crystal structures alpha-Ba3Y(BO3) and beta-Ba3Y(BO3)(3), have been achieved by controlling the sintering temperature. alpha-Ba3Y(BO3)(3) was attained through solid phase transition from beta phase by increasing sinter temperature from 1100 to 1200 degrees C . Under the UV excitation, the dominant emission peak of Eu3+ ions shifts from 593 nm to 611 nm when the phase transmits from beta phase to alpha phase, which indicates that site symmetries of two different phases are quite different. The crystallographic sites for Eu3+ ions were identified in the F-7(0) --> D-5(0) excitation spectra by using a pulsed, tunable, and narrowband dye laser to detect the microstructure and crystallographic surrounding of Eu3+ ions in alpha-Ba3Y(BO3)(3) and beta-Ba3Y(BO3)(3). The microstructures of Eu3+ doped in alpha-Ba3Y(BO3)(3) and beta-Ba3Y(BO3)(3) were discussed on the basis of crystal structure and luminescence spectra. (C) 2015 Elsevier B.V. All rights reserved.