A novel charge transfer blue-emitting phosphor: BaY2Si3O10

A novel charge transfer blue-emitting phosphor BaY2Si3O10 has been synthesized by the conventional solid state reaction method. The results of XDR patterns demonstrate that the single-phase BaY2Si3O10 was formed with P21/m symmetry. The excitation spectrum of BaY2Si3O10 consists of two bands centered at 294 and 333 nm, which are associated with the 1A1→1T2 and 1A1→1T1 charge transfer between oxygen 2p orbital and the 3d orbital of Si4+ ions, respectively. Strong emission with the peak position at 426 nm and with the decay time in ns range is revealed. The blue emission is corresponding to the superposition of 3T2→1A1 and 3T1→1A1 charge transfer under the near-ultraviolet excitation of 333 nm. The enhancement of the blue luminescence calcining in different atmospheres suggests that a reductive atmosphere is better to form BaY2Si3O10 particles with a better light yield. The CIE chromaticity coordinates of as-prepared BaY2Si3O10 are (0.181, 0.148) for air-calcined sample and (0.161, 0.090) for H2-N2 calcined one, respectively.