[Preparation and luminescence characteristics of Ba1.97 Ca1-x (B3O6)2: Eu(0.03)2+, Mn(x)2+ phosphor for white LED].

The Ba1.97 Ca1-x (B3O6)2 : Eu2+, Mn(x)2+ (x = 0, 0.03, 0.06, 0.15) phosphors were synthesized by high temperature solid-state reaction, and their phase composition and luminescence properties were studied. In these phosphors, Eu2+ locates at the crystal sites of Ba2+ and Ca2+ ions. Under 317 nm UV light excitation, the 5d --> 4f transition of Eu2+ forms a broad blue emission band with a peak at 450 nm. With the energy transfer from Eu2+ ions, Mn2+ ions emit a broad red band with the peak at 600 nm. The mixture of the broad blue emission and a broad red emission forms an approximate white light with the CIE chromaticity (x = 0.371, y = 0.282). The phosphors can be excited effectively by UV light in the range of 250-400 nm, so they are the potential candidates for single white light-emitting phosphor excited by UV-LED.