A novel charge transfer blue-emitting phosphor: BaY 2 Si 3 O 10

Abstract A novel charge transfer blue-emitting phosphor BaY 2 Si 3 O 10 has been synthesized by the conventional solid state reaction method. The results of XDR patterns demonstrate that the single-phase BaY 2 Si 3 O 10 was formed with P 2 1 /m symmetry. The excitation spectrum of BaY 2 Si 3 O 10 consists of two bands centered at 294 and 333 nm, which are associated with the 1 A 1 → 1 T 2 and 1 A 1 → 1 T 1 charge transfer between oxygen 2 p orbital and the 3 d orbital of Si 4+ 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 3 T 2 → 1 A 1 and 3 T 1 → 1 A 1 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 BaY 2 Si 3 O 10 particles with a better light yield. The CIE chromaticity coordinates of as-prepared BaY 2 Si 3 O 10 are (0.181, 0.148) for air-calcined sample and (0.161, 0.090) for H 2 -N 2 calcined one, respectively.