1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China 2. Dalian Luminglight Sciences and Technology Co., Ltd, Dalian 116025, China 3. Optoelectronic Technology Institute, Dalian Maritime University, Dalian 116026, China
Abstract：Series of novel broad excitation band phosphors M2MgSi2O7∶Eu, Dy(M=Ca, Sr) were prepared by a high temperature solid-state reaction method. The crystal structure of compound was characterized. And the effects of part substitution of alkaline-earth on crystal structure, photoluminescence spectra and luminescence properties were also investigated. It is found that the excitation band of silicate luminescent materials extend to visible region and they exhibit yellow, green and blue long afterglow luminescence after excited by ultraviolet or visible light. Ca2MgSi2O7∶Eu, Dy luminescent materials can be excited effectively under the 450-480 nm range and exhibit a strong emission at 536 nm, nicely combining with blue light emitted by InGaN chips to produce white light. This promises the silicate luminescent materials a potential yellow phosphor for white LED.
Key words：Silicate;Broad excitation band;Rare earth;Long afterglow phosphor;White LED
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