新型WLED荧光粉Ca_2MgSi_2O_7:Ce^(3+),Eu^(2+)的能量传递和光色研究

Energy Transfer and Emission Color Investigation of A New WLED Phosphor Ca_2MgSi_2O_7:Ce^(3+),Eu^(2+)

用高温固相法制备了Ca2MgSi2O7:Ce3+,Eu2+,并研究其发光特性。Ce3+的发射带峰值位于410 nm,对应于Ce3+的5d→4f跃迁;Eu2+的发射带峰值位于530 nm,对应于Eu2+的5d→4f跃迁。双掺样品的发射光谱表明两种离子间存在高效的电偶极-电偶极能量传递。当Ce3+和Eu2+浓度分别为2%和0.125%时,样品发射光谱(λex=360 nm)色坐标为(0.221,0.312),落在白光区。以上研究说明Ca2MgSi2O7:Ce3+,Eu2+是一种适用于近紫外芯片的新型WLED荧光粉,其光色可调谐。

Ca2MgSi2O7：Ce3＋,Eu2＋ samples were prepared by the solid-state reaction. The luminescent properties of samples were also investigated. The Ce3＋ -doped samples showed a broad emission band peaked at 410 nm which originated to the 5d→4f transition of Ce3＋, while the emission band of Eu2＋ doped ones centered at 530 nm was attributed to the 5d→4f transition of Eu2＋. The emission spectra of codoped samples implied that there was effective dipoledipole energy transfer from Ce3＋ to Ea2＋ in The CIE chromaticity coordinate of emission of the co-doped sample was x = 0. 221, y = 0. 312 when the concentrations of Cc3＋ and Eu2＋ were 2% and 0. 125% , respectively. All of the above indicated that Ca2MgSi2O7：Ce3＋,Eu2＋ was a new kind of color-tunable WLED phosphor suitable for the near ultraviolet chips.