Long-UV excited white-emitting phosphors

摘要

In this work we have developed white-emitting phosphors that can be activated at long UV wavelengths. A blend of EuAlO_3:Eu~(3+) (red), EuAlO_3:Eu~(2+) (green) and Y_2SiO_5:Ce~(3+) (blue), prepared by the combustion synthesis technique, yielded a white luminescence spectrum that can be stimulated with long wavelength UV photons. White emission from rare earth doped single-host yttrium oxyorthosilicates, has been also investigated. (Y_(0.9625)Ce_(0.0075)Tb_(0.03))_2SiO_5 exhibits an efficient, nearly D_(65), white emission with chromaticity x=0.225, y=0.320 due to a non-radiative (inductive) energy transfer between Ce~(3+) and Tb~(3+).