白光LED用新型红色荧光粉Sr_5(BO_3)_3Cl:Eu^(3+)的制备与发光特性  

Synthesis and Luminescence Properties of a Novel Red Sr_5(BO_3)_3Cl:Eu^(3+) Phosphor

作　　者：杨志平[1] 宋延春[1] 韩月[1] 潘飞[2] 刘鹏飞[1] 赵引红[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]河北大学电子信息工程学院,河北保定071002

出　　处：《材料工程》2013年第6期72-76,共5页Journal of Materials Engineering

基　　金：国家自然科学基金(50902042);河北省自然科学基金(F2009000217)

摘　　要：采用高温固相法合成了Sr5(BO3)3Cl:Eu3+新型红色发光材料,并对其结构和发光特性进行了研究。X射线衍射测试表明合成材料为纯相Sr5(BO3)3Cl晶体。材料的主发射峰位于587,596,613nm和626nm,对应Eu3+的5 D0→7F1,7F2辐射跃迁。监测626nm发射峰,激发光谱主峰位于392nm,可被InGaN管芯有效激发。通过时间分辨光谱测得Eu3+离子5 D0能级的荧光寿命约为2.28ms。研究了Eu3+离子掺杂浓度对Sr5(BO3)3Cl:Eu3+发光性能的影响,结果随着Eu3+离子浓度的增大,样品的发光强度先增大后减小,最佳掺杂浓度为16%(摩尔分数)。计算了Eu3+离子浓度猝灭的临界距离为1.46nm。测量了不同Eu3+浓度样品的色坐标,均位于色品图红光区,符合NTSC标准。A novel red phosphor Sr5（BO3）3Cl：Eu3＋ was prepared by high temperature solid state reac- tion method. Its luminescence properties and structure were studied. X-ray power diffraction show that the fabricated samples are pure phase crystals. The emission spectra of the Sr5（BO3）3Cl：Eu3＋ phosphors consist of some sharp emission peaks of Eua＋ ions, which centered at 587, 596, 613nm and 626nm, corresponding to the 5D0→7F1, 7F2 typical transitions of Eua＋ respectively. Monitoring emission at 626nm, the strongest excitation spectra appears at 392nm, which indicate that this phosphor can be excited effectively by InGaN. The decay time of 5D0 level in Eua＋ is 2. 28ms. The effect of Eu3＋ concentration on the emission spectrum intensity of Sr5 （BOa）3C1.Eua＋ was investigated. The resuits show that the emission spectrum intensity increase with raising Eua＋ concentration until reach the maximum value at 16 % （mole fraction）, then it decrease. The critical distance of Eu3＋ was calculated as 1.46nm. The CIE coordinates of Sr5（BO3）3Cl：Eu3＋ were measured, which were very close to the NTSC standard.

关 键 词：发光 Sr5(BO3)3Cl 光谱 浓度猝灭 荧光粉 

分 类 号：O482.31[理学—固体物理]