Abstract

White-light light-emitting diodes (LEDs) are of interest in terms of energy efficiency and practical advantages compared to conventional bulbs of phosphorescent tubes. Such LEDs may be based on blue LEDs, which are coated with a yellow phosphor, YAG:Ce^{3 +}. [1]. Another approach is the use of ultraviolet (UV) LEDs fitted with mixed color emission phosphor(s). Most attentions have been paid on the development of the ternary silicates as the phosphors for UV LEDs, such as Sr₃MgSi₂O₈:Eu²⁺, Mn²⁺ and Ba₃MgSi₂O₈:Eu²⁺, Mn²⁺[2,3]. Here, we reported a new phosphate white LED phosphors, Eu²⁺, Mn²⁺ co-doped Ca₈MgY(PO₄)₇ phosphors, which show tunable emission from blue, blue-white, warm-white and deep red.

© 2009 IEEE