摘要
采用高温固相还原反应合成了新型单相荧光粉Ca_9NaZn(PO_4)_7(CNZP):Ce^(3+),Tb^(3+),并对样品的发光性能和能量传递过程进行分析。研究表明,在波长为310nm紫外光激发下,Ce^(3+)、Tb^(3+)双掺体系发射光谱同时包含Ce^(3+)的宽带和Tb^(3+)的线状发射光谱;在CNZP体系中,Ce^(3+)→Tb^(3+)间能量传递的临界距离Rc=1.216nm,为共振能量传递,机理被证实为四极子-四极子相互作用。从CIE色度坐标图可以看出,利用能量传递效果和改变CNZP:0.02Ce^(3+),yTb^(3+)中掺杂离子的相对浓度可实现颜色从蓝紫色到绿色的调控,表明所得荧光粉在WLED用紫外激发荧光粉中具有潜在的应用价值。
A series of novel single-phase Ca9NaZn（PO4）7：Ce^3＋,Tb^3＋phosphors are synthesized by a high temperature solid-state reaction method and the luminescence and energy transfer properties of the samples are studied in details.When excited by 310 nm,the Ce^3＋and Tb^3＋co-doped phosphor exhibits two emission parts,which are ascribed to 5 d→4 fand 5 D4→7 F3,4,5,6transitions of Ce^3＋and Tb^3＋,respectively.The results show that the energy transfer process between Ce^3＋and Tb^3＋belongs to a resonant type,the critical distance is calculated to be 1.216 nm,and the energy transfer mechanism is proved to be a quadrupole-quadrupole interaction.Ultimately,by utilizing the principle of energy transfer and appropriately tuning Ce^3＋and Tb^3＋concentrations,Ca9NaZn（PO4）7：0.02Ce^3＋,yTb^3＋can realize tunable emission color from the violet-blue to green region and have potential applications as a UV-convertible phosphor in white light-emitting diodes.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2015年第11期2148-2153,共6页
Journal of Optoelectronics·Laser
关键词
荧光粉
稀土
能量传递
颜色调控
phosphor
rare earth
energy transfer
tunable color
