The authors have demonstrated white light emission of rare earth (RE)-free Mn-doped $\mathrm{SnO}\text{-}\mathrm{ZnO}\text{-}{\mathrm{P}}_2{\mathrm{O}}_5$ glass. The RE-free glass shows white light emission with a high value of quantum efficiency (QE) comparable to conventional crystalline phosphor. It is notable that the high QE value is attained for RE-free transparent glass, and the broad emission can be continuously tuned by both the amount of activator and the composition of the glass. Since this glass possesses low-melting property, we emphasize that the glass phosphor will lead to the development of a novel inorganic white-light-emitting device in combination with a solid state UV light-emitting source.