4. Conclusion
A series of BMP:Eu2+, Mn2+ phosphors were synthesized by a coprecipitation
method, then their optical properties and morphologies
were investigated. Particles prepared by a co-precipitation
method have a smaller size in diameter than that prepared by conventional
solid-state reaction method. A broad blue and yellow
emission band was detected in the emission spectra of Eu2+Mn2+
co-doped Ba2Mg(PO4)2 phosphor, which corresponds to the 5d–4f
transition of Eu2+ ions and the 4T1(4G)?6A1(6S) transition of Mn2+
ions, respectively. The fact of the overlap between Eu2+ emission
band and Mn2+ excitation band proves the existense of energy
transfer from Eu2+ to Mn2+. Due to energy transfer efficiency formula,
emitting color of the BMP:Eu2+, Mn2+ phosphor could be
tuned by adjusting relative contents of Eu2+ and Mn2+. In addition,
the excitation spectra of BMP:Eu2+, Mn2+ covers the range of
250–400 nm, thus, these blue and yellow double color emitting
phosphors have potential applications in near-UV white LED.