A new yellowish green luminescent material SrMoO4:Tb3+

A novel yellowish green phosphor tervalent terbium (Tb3+) doped strontium molybdate (SrMoO4) Was synthesized by conventional solid-state reaction method and its crystal structure and luminescent properties are investigated in this paper. The X-ray diffraction patterns (XRD) showed that the phosphor sintered at 750 degrees C for 3 h was a pure SrMoO4 phase. The excitation spectrum consisted of two bands and the two excitation peaks located at 375 nm and 488 nm respectively. The emission spectrum was composed of four narrow bands, in which the strongest emission was located at 548 nm. The particle size analysis indicated that the median particle size D-50 = 2.89 mu m and range of particle size distribution was narrow. These results showed that the SrMoO4:Tb3+ phosphor was a promising yellowish green phosphor for ultraviolet light emitting diode (UVLED) and blue LED based white LED. The appropriate concentration of Tb3+ was 5 mol% for the highest emission intensity at 548 nm. Natrium ion (Na+) was found to be a promising charge compensator for SrMoO4:Tb3+ phosphor. (C) 2009 Elsevier B.V. All rights reserved.