Eu-doped (Y

Gd)BO

3

:Eu phosphor with spherical particle morphology

small size

high crystallinity and good photoluminescence (PL)intensity was prepared by co-precipitation method. Ultrafine precursor powders were obtained by controlling the solution concentration of Y

3+

Gd

3+

Eu

3+

and temperature of system

the precursor is amorphous and soft when the system temperature maintain from 50℃ to 70℃.The phosphor particle size is influenced by the solution concentration

and the mean size of the (Y

Gd)BO

3

:Eu particles decreased from 2.3m to 0.8m when the solution concentration changed from 0.2 mol/L to 0.5mol/Land shifted to the larger size with the further increase of the solution concentration. Conventional solid state reaction require higher sintering temperature above 1200℃ for pure (Y

Gd)BO

3

:Eu phase. However

the co-precipitation allows a significant decrease of sintering temperature and the phosphor sintered at 800℃ have pure orthorborate phase already. The X-ray diffraction peak intensities increased with increasing temperature. The phosphors prepared at different temperature 800

1000

1200 and 1300℃ were characterized by X-ray diffraction

SEM

particle size determination and photoluminescence. In addition

the characteristics of the particle were compared with those of a commercial product. Crystallinity

particle size and luminescence intensity are dependent on sintering temperature. The morphology and size of synthesized particles are strongly effected by sintering temperature. The phosphor particles prepared at 1200℃ have the best characteristics

such as completely spherical shape

filled morphology

fine particle size

no-aggregation

and the commercial product prepared by conventional solid state reaction has a irregular shape with aggregation

the particles began to agglomerate and the particle size became larger at an firing temperature of 1300℃. The luminescence intensities of the phosphors increase with the sintering temperature and the brightness of phosphor increase with increasing temperatures due to favorable crystallization and has a maximum values at 1200℃ when excited with UV light. The particles sintered at 1200℃ exhibited better morphology than those of a commercial product.