Red phosphor Li_2Mg_2(WO_4)_3: Eu~(3+) with lyonsite structure for near ultraviolet light-emitting diodes

摘要

A series of Eu~(3+)-activated Li_2Mg_2(WO_4)_3 (LMW) materials were synthesized by high temperature solid state reactions. The phosphor can be effectively excited by 394 nm near ultraviolet light and emit intense red light with high color purity. Prepared phosphors can be indexed to LMW with particular lyonsite structure. The occupation of Eu~(3+) in LMW is selective. Most of Eu~(3+) comes into ~1A sites without inversion symmetry. The present research suggests that LMW is a suitable host for luminescence applications and Eu~(3+)-activated LMW is a promising phosphor for phosphor-converted white light-emitting diodes.