Mn ions were co-doped in yttrium aluminum garnet doped cerium (YAG:Ce) phosphors as a co-activator and host lattice element using the co-precipitation method. These ions broadened the emission spectra of the pure YAG:Ce phosphor, which is caused by the 2 E- 4 A 2 , 5 E- 5 T 2 or 1 T 2 - 5 T 2 transition. From our X-ray diffraction results, we observed that Ce 3+ (1.032 Å) was substituted at the Y 3+ (0.900 Å) site, and Mn 4+ (0.538 Å) and Mn 3+ (0.67 Å) were substituted at the Al 3+ (0.535 Å) site. The chromaticity color co-ordinates of YAG:Ce 0.06 is (0.203, 0.167), and the indices of YAG:Ce 0.06 , Mn 0.04 and YAG:Ce 0.06 , Mn 0.08 are (0.249, 0.181) and (0.233, 0.194), respectively. The manganese co-doped yttrium aluminum garnet doped cerium blended with the YAG:Ce phosphor showed improved white light emission.
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Zhao et al. (2011) studied this question.