The second group metal tungstates have attracted particular attention because they have practical importance as laser host materials in quantum electronics and scintillators in medical applications. The luminescence of SrWO

4

which can be excited by short-wavelength ultraviolet radiation

X-rays

cathode rays etc.

mainly shows a blue emission spectrum. It is generally agreed that a thin film phosphor has superior resolution compared to powders because of its smaller grain size and less lateral scattering. Less extensive investigation has been made on the preparation of the SrWO

4

films. A variety of physical and chemical deposition methods including sputtering deposition

electron beam evaporation and electrochemical method have been reported for the preparation of SrWO

4

films. In addition to these techniques

spray pyrolysis method is very interesting because of its advantages of no vacuum

simple instrumentation and low cost. In this paper

SrWO

4

films were prepared on glass substrates by spray pyrolysis. The effects of preparation conditions and monovalent

bivalent and trivalent cation doping on cathodoluminescence (CL) properties of the films were studied. Polycrystalline SrWO

4

films formed a scheelite structure after being annealed above 300℃. They exhibited cathodoluminescence consisting of a blue emission band at 448nm and a blue-green emission band at 488.6nm. The blue and blue-green emission intensities increased with annealing temperature. Annealing atmosphere and doping with Ag

+

and La

3+

did not influence the characteristics of the blue and blue-green emissions

whereas Eu

3+

did. The results indicated both the blue and blue-green emissions originated from the charge transfer transition of WO

4

2-

groups.