LED用KZn_4(BO_3)_3∶Eu^(3+)荧光粉的合成与发光性能研究  

Synthesis and photoluminescence properties of KZn_4(BO_3)_3∶Eu^(3+) red-emitting phosphor

作　　者：孙雷[1] 张毅[2] 胡兴凯[2] 田浩[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]南开大学电子信息与光学工程学院,天津300071

出　　处：《液晶与显示》2014年第6期893-900,共8页Chinese Journal of Liquid Crystals and Displays

摘　　要：荧光粉转化法是目前制备白光LED的主流技术。但是商业化的荧光粉由于缺少红色部分或红色不稳定,使得制备出的LED灯泡颜色偏冷,因此研制低成本、性能稳定的红色荧光粉具有重要的意义。本项目以化学性质稳定、合成工艺温和的硼酸盐KZn4(BO3)3为基质,掺杂稀土离子来研究荧光粉的发光性能。通过高温固相法合成了一系列不同掺杂浓度的KZn4(BO3)3∶Eu3+,并测试了XRD衍射图谱,发射和激发光谱。研究表明Eu3+离子倾向于占据Zn2+格位。同时,KZn4(BO3)3∶Eu3+的最佳激发波长(393nm)位于近紫外波段,适于用近紫外LED芯片激发来制备LED。KZn4(BO3)3∶Eu3+的最强发射峰位于590nm,属于5 D0-7F1跃迁。当发生浓度猝灭时,Eu3+-Eu3+离子间的临界距离为3nm。该荧光粉的色坐标为(0.629 7,0.369 9),色饱和较高。该物质是一种潜在的可被用于LED照明用的红色荧光粉。Phosphor transformation is the main method of producing white-light LEDs.However,most phosphors in the market are lack of red component or color stability,because most commercial LEDs produce cool white light.Thus it is realistic to search for new red phosphors with high stability and low cost.In this regard,borates,chemical stable and easily productive,have attracted our attention.The structure and photoluminescence properties of KZn4（BO3）3doped with Eu^3＋are analyzed.We have synthesized a series of KZn4（BO3）3∶Eu^3＋with different doping concentration by solid state reactions.From the X-ray diffraction data,it is concluded that Eu^3＋ions are inclined to occupy Zn^2＋site in the structure of KZn4（BO3）3.And the PLE indicates that the best exciting wavelength（393nm）of KZn4（BO3）3∶Eu^3＋is near ultraviolet,which makes it suitable for near-UV LEDs.According to the PL,the strongest peak locates at 590 nm which is ascribed to the transition of ^5D0-^7F1.Inaddition,the quenching concentration of Eu^3＋is about 1.5%,and the critical distance is about 3nm.Finally,the CIE coordinates of KZn4（BO3）3∶Eu^3＋is（0.629 7,0.369 9）,which has high color saturation.The material is a potential red phosphor used for LEDs.

关 键 词：材料 发光二极管(LED) 荧光粉 稀土离子 发光性能 

分 类 号：O482.31[理学—固体物理]