Abstract：Emission spectra

relative luminance and excitation spectra characteristics are important factors in the field of phosphors research. Measurement of emission spectra is relative simple

its precision and repeatability can be ensured within 1% more easily

but relative luminance and excitation spectra is difficult to have precision and repeatability of 1% affected by test method. In this article

one method that phosphors surface diffuse reflection intensity is measured to improve relative quantum efficiency accuracy of phosphors for PDP in UV-VUV range between 120nm to 300nm

the relative quantum efficiency measuring precision is below 1% and the comparative subtle excitation spectrum curve is obtained

the spectra resolution is 1nm. At last

the measurement of excitation spectrum of (BaMgAl10O17：Eu) blue phosphors and (LaPO4:Tb

LaPO4:CeTb

YPO4：Tb )three green phosphors is taken.