Y_(6)TeO_(12):Eu^(3+)红色荧光粉的制备与发光特性研究  

Preparation and Luminescent Properties of Red-emitting Y_(6)TeO_(12):Eu^(3+)Phosphor

作　　者：李荣青 周薇薇 童悦 郑庆华 吕兆承 赵旺 夏峥嵘 刘芳芳 LI Rongqing;ZHOU Weiwei;TONG Yue;ZHENG Qinghua;LV Zhaocheng;ZHAO Wang;XIA Zhengrong;LIU Fangfang(School of Electrical Engineering,Huainan Normal University,Huainan 232038,China)

机构地区：[1]淮南师范学院电子工程学院,淮南232038

出　　处：《光子学报》2023年第2期279-290,共12页Acta Photonica Sinica

基　　金：安徽高校自然科学重点研究项目(No.KJ2020A0639);安徽省自然科学基金(No.2108085MB53);校级科研项目(No.2020XJYB003)。

摘　　要：利用高温固相法在1200℃制备了一系列红色荧光粉(Y_(1-x))_(6)TeO_(12):xEu^(3+)(x=0.1~0.5)材料。对样品进行了X射线衍射、形貌特征、激发和发射光谱、浓度猝灭、热稳定性、荧光衰减曲线以及发光二极管封装与光色电性能等方面的分析与探究。结果表明:该红色荧光粉样品能被近紫外光(393 nm处)和蓝光(464 nm处)有效激发,在632 nm处表现出较强的红光发射。根据荧光强度与掺杂浓度的变化趋势,确定出最佳Eu3+掺杂量为x=0.3,更多的掺杂量引起浓度猝灭。进一步分析激活剂Eu^(3+)间能量传递类型,得出电偶极-电偶极作用导致了浓度猝灭。(Y_(0.7))_(6)TeO_(12):0.3Eu^(3+)在150℃时积分发光强度是室温的76.5%,热激活能为0.1969 eV。该样品的荧光寿命为813μs,色坐标值为(0.6376,0.3431),并基于板上芯片工艺进行了发光二极管封装,对光色电性能进行了表征。(Y_(1-x))_(6)TeO_(12):xEu^(3+)荧光粉表现出了良好的发光特性、发光热稳定性及色纯度,在白光发光二极管中具有潜在的应用价值。The industry of white light-emitting diodes,next-generation illumination sources,has become an interesting field for their superior advantages such as energy savings,high efficiency,long operating lifetime as well as environmental friendliness.By far,the most effective white light-emitting diode is a combination of a near-ultraviolet chip and yellow-emitting phosphors.However,this type of phosphor converted white light-emitting diode has some disadvantages,it suffers from the weakness of low color rending index and high correlated color temperature because of the deficiency of red component.Thus,to overcome this problem,a large number of red phosphors,especially the trivalent Eu3+doped phosphor,have been widely studied.Eu3+ion is an important red activator in most of the commercial red phosphors,which can provide an efficient and narrow band emission due to characteristic 4f-4f transitions.Especially,Eu^(3+)ions can be used to prove the point group symmetry of the substituted site in the host.When Eu3+ions occupy noncentrosymmetric lattice sites,Eu3+can emit intense red emission,benefiting to improve the overall efficiency of the white light-emitting diodes.So the host can affect the intensity of emission peaks of Eu3+ion.Tellurate exhibits excellent properties in the optical,physical,and chemical fields.Given the low phonon energy of tellurate,this material can avoid the competitive non-radiative decay for the Eu3+ions doped.Therefore,tellurate is suitable for hosting matrices used in phosphors.We report herein,the preparation and luminescent properties of red-emitting(Y_(1-x))_(6)TeO_(12):xEu^(3+)phosphor.The(Y_(1-x))_(6)TeO_(12):xEu^(3+)phosphors were prepared through the high-temperature solid-state reaction at 1200°C for 20 h.The(Y_(1-x))_(6)TeO_(12):xEu^(3+)phosphors were prepared in this way for seven different concentrations of Eu3+(x=0.1,0.2,0.3,0.4 and 0.5).The samples(Y_(1-x))_(6)TeO_(12):xEu^(3+)were analyzed in detail by XRD,excitation and emission spectra,concentration quenching,thermal stability,l

关 键 词：(Y_(1-x))_(6)TeO_(12):xEu^(3+) 发光特性 浓度猝灭 热稳定性 白光发光二极管 

分 类 号：O482.31[理学—固体物理]