The phosphor BaSi

2

O

5

:Pb

2+

has been widely used in manufacturing of black light lamps.However

the detailed information about its preparation can not be found in the literature.The aim of this research is to work out the optimum conditions for preparing BaSi

2

O

5

:Pb

2+

having efficient emission in ultraviolet.A solid state reaction between barium carbonate and silicic acid in the presence of activating agent PbO

2

and some fluxes was studied with the aid of orthogonalizing method of the experimental design.The optimum reaction conditions are found to be as follows.The excess silicic acid must be used to inhibit the formation of other barium silicates so as to ensure the product being of a sanbornite structure.The mole ratio of SiO

2

/BaCO

3

is 2.3-2.8.The activating agent

lead oxide

should be added in a large amount.The mole ratio of PbO

2

/BaCO

3

is 0.04-0.17.Because of the volatility of lead oxide at high firing temperature.some loss of lead occurs.The actual concentration of divalent lead remained in the phosphor is determined to be about 0.8 mole by atomic emission spectroscopy.The addition of fluxes BaF

2

BaC

l2

and BaSO

4

promote the solid reaction.Firing should be proceeded at the temperature above 1100℃The excitation and emission spectra of BaSi

2

O

5

:Pb

2+

obtained in our laboratory are studied and they are as same as the commercial products.Furthermore

its integration intensity of luminescence is higher than that of the commercial phosphors and is evaluated to be 108% of that of Toshiba phosphor SPD-8S.