Ce3+/Mn2+共掺Ca3Y（PO4）3红色荧光粉的制备及其能量传递  

Preparation and energy transfer of Ce3+/Mn2+ co-doped Ca3Y（PO4）3 red phosphors

作　　者：冯宁宁 阳结根 杨子諓 张佩雪 王春兰[1] FENG Ningning;YANG Jiegen;YANG Zijian;ZHANG Peixue;WANG Chunlan(School of Science,Xi′an Polytechnic University,Xi′an 710048,China;College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]西安工程大学理学院,陕西西安710048 [2]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《纺织高校基础科学学报》2019年第3期270-275,共6页Basic Sciences Journal of Textile Universities

基　　金：国家自然科学基金(11604252);陕西省自然科学基金(2017JQ1015)

摘　　要：为了改善白光LED荧光粉中红光的缺失,采用高温固相法制备Ce^3+/Mn^2+共掺Ca3Y(PO4)3的新型红色荧光粉。通过X射线衍射(XRD)分析,证明在1350℃下煅烧10h,反应结束后应迅速降温才能合成所需样品。在波长325nm光激发下,Ca3Y(PO4)3∶Ce^3+,Mn^2+样品存在2个发光中心,即383nm和620nm,分别对应于Ce^3+的5d-4f和Mn^2+的4T1(4G)-6A1(6S)的电子跃迁。随着Mn^2+离子浓度的增加,样品的发光颜色从蓝光逐渐向红光区域移动,直到Mn^2+离子浓度达到0.12mol时,样品的色度坐标为(0.406,0.221),位于红光部分。原因在于Ce^3+→Mn^2+间的能量传递,能量传递机理为电四极-电四极相互作用。由于Mn^2+离子发光中心周围的晶体场环境受到Mn^2+掺杂浓度的影响而发生改变,使其中心波长从615nm红移到627nm。成功合成了一种新型的单一基质的Ca3Y(PO4)3∶Ce^3+/Mn^2+红色荧光粉,在荧光粉转换白光LED的方案中拥有潜在的应用价值。In order to improve the red light loss in wite LED phosphors,a novel single-phase Ce^3+/Mn^2+ co-doped Ca 3Y(PO 4) 3 red-phosphor was successfully prepared via a high temperature solid-state method.The study shows that after calcining at 1 350 ℃ for 10 h, the required samples could be synthesized only by the condition of rapid cooling, which can be demonstrated by X-ray diffraction (XRD) analysis.Upon 325 nm excitation, the emission spectra of Ca 3Y(PO 4) 3∶Ce^3+, Mn^2+ samples have two emitting centers at about 383 nm and 620 nm, respectively, corresponding to the electron transition of 5d-4f of Ce^3+ as well as 4T 1( 4G)- 6A 1( 6S) of Mn^2+.As Mn^2+-doping concentration increases, the luminescent colour of the sample gradually moves from blue light to red light, until the concentration of Mn^2+ ion reaches 0.12 mol, and the chromaticity coordinate of the sample is (0.406, 0.221) in the red light part, which is due to the energy transfer of Ce^3+→Mn^2+ ions, whose energy transfer mechanism is the electric quadrupole-quadrupole interaction.Moreover, the crystal field environment at the Mn^2+ luminescence center is changed because of the influence of Mn^2+ doping concentration, resulting in the red shift of its emitting center from 615 to 627 nm.Based on the above analysis, a novel single-phase Ca 3Y(PO 4) 3∶Ce^3+, Mn^2+ red phosphor is synthesized, which owns potential application value in the phosphors-converted white light-emitting-diodes (LEDs).

关 键 词：Ca3Y(PO4)3 红色荧光粉 能量传递 高温固相法 色度坐标 白光LED 

分 类 号：O469[理学—凝聚态物理]