A novel charge transfer blue-emitting phosphor: BaY₂Si₃O₁₀

Abstract

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