The spray pyrolysis process was employed to synthesize the single host silicate phosphor

Ba

3

MgSi

2

O

8

:Eu

2+

Mn

2+

.It was found experimentally that

its three-colour emission peaks situated at 608

500 and 437 nm respectively under excitation of 375 nm irradiation.The phosphor particle is in the size of around 4.5 μm.The effects of Al addition to the host on the microstructure and emission spectroscopy were investigated in details.The addition of Al ion to the host leads to a substantial change of intensity ratio between blue to green emission while the intensity of red-emission remains unchanged.Consequently

the parameters related to the white emission such as CIE coordinate

colour temperature can be adjusted by changing the amount of Al addition.Based on the modification of host microstructure of the silicate

the intrinsic effects of Al addition on the coordination number

ionic occupation and energy transfer were discussed.Theoretically

it has been well established

from classical silicate science

that the modification of the tetrahedral microstructure of Si-O by Al-ion addition could result in a great change of the properties(i.e.PL in our case) of the silicate host.There is some disputation

however

of whether the charge compensation or atomic configuration plays a key role to change the priority of the lattice occupation

crystal field around the different cations.The experimental facts in this work greatly support the fact that the impact of Eu ions situated at different lattices of Ba ions on the emission spectroscopy due to the disturbance of Al ion to the silicate network.Hence

this three-colour emission feature of this cost-effective silicate phosphor may become one of the important candidates for future high luminous efficiency white LEDs applications.