Compatibility of Photoluminescence Properties in ScPO₄:Eu3+, Tb3+ Phosphor for White Light Emitting Diodes.

Abstract

ScPO₄:Eu³⁺, Tb³⁺ phosphors with tuned emission color were prepared through high temperature solid-state reaction. The structure, morphology and photoluminescence properties of the title samples were collected by XRD, SEM and fluorescence spectrophotometer, respectively. Co-doping Eu³⁺ and Tb³⁺ in ScPO₄ does not change the body-centered tetragonal structure of the host. And the morphology remains essentially unchanged except for slight agglomeration. Changing the ratio of Tb³⁺/Eu³⁺, the tuned emission can be achieved, the color could be adjusted from green through yellow to orange-red. The ScPO₄:0.03Tb³⁺, 0.03Eu³⁺ phosphor with high thermal stability as the single matrix phosphor can be suitable for the NUV-pumped white LED. The white LED with a color rendering index of 86.5 and a correlated color temperature of 3470 K has been generated by packaging BAM:Eu²⁺ with ScPO₄:0.03Tb³⁺, 0.03Eu³⁺ on an NUV-InGaN chip.