Three primary colors upconversion phosphors and combined white upconversion luminscence in Y2O2S matrix

Abstract Three primary colors upconversion phosphors in Y 2 O 2 S matrix of Y 2 O 2 S:Er, Y 2 O 2 S:Yb/Er, Y 2 O 2 S:Yb/Ho, Y 2 O 2 S:Yb/Eu and Y 2 O 2 S:Yb/Tm were prepared by flux method. SEM, XRD, UPL and CIE were used to characterize the particle morphology, phase composition, luminescent properties and the emitting light color. Through the optimization of active ion doping concentration, upconversion luminescent properties were promoted. The upconversion luminescent colors of the obtained phosphors were green/red for Y 2 O 2 S:Er and Y 2 O 2 S:Yb/Er, green for Y 2 O 2 S:Yb/Ho, red for Y 2 O 2 S:Yb/Eu and blue/red for Y 2 O 2 S:Yb/Tm. Different combinations of three primary colors upconversion phosphors were investigated to obtain white upconversion luminescence.