摘要
通过离子交换一步法合成了K2SiF6∶xMn4^+,yTi4^+系列红色荧光粉,研究了Mn4^+、Ti4^+掺杂量对荧光粉结构及发光性能的影响。采用X射线衍射仪表征了荧光粉的晶体结构,发现少量Mn4^+、Ti4^+掺杂对荧光粉的空间结构未产生显著的影响,制备的红色荧光粉呈立方体面心结构。荧光光谱分析表明,位于353nm和455nm处的激发峰分别属于Mn4^+(3d^3)的^4A2→^4T1和^4A2→^4T2的电子跃迁。以波长455nm的蓝光作为激发光源,Mn4^+掺杂量为1%(摩尔分数)的K2SiF6∶1%Mn4^+荧光粉在580~750nm范围内出现3个尖峰,分别位于616nm、634nm、650nm处,对应于Mn4^+的^2Eg→^4A2跃迁,Ti 4^+的掺杂使得荧光粉在634nm处的发射强度提高了7倍左右。当温度上升至420K时,K2SiF6∶1%Mn4^+荧光粉在634nm处的发射强度仅仅降至室温时的65.8%,表现出优良的热稳定性。
K2SiF6∶Mn4^+red phosphors co-doped with Ti4^+were synthesized using ion exchange method.X-ray power diffraction,temperature-dependent luminescence,and photoluminescence analysis were used for characterizing the phosphors.The phosphors doped with various concentrations of Mn4^+and Ti 4^+had identical well-formed face center cubic of K2SiF6.For phosphors of K2SiF6∶1%Mn4^+,excitation peaks located at 353nm and 455nm correspond to electron transition of^4A2→^4T1 and^4A2→^4T2,respectively.The peaks showed in the emission spectra(616nm,634nm,650nm)belong to the^2Eg→^4A2 transition of Mn4^+.Otherwise,the doping of Ti 4^+in phosphors resulted in the maximum luminous intensity of phosphors at peak of 634nm increasing by about 7times,comparing to the K2SiF6∶1%Mn4^+phosphors.At the temperature of 420K,the emission intensity of K2SiF6∶1%Mn4^+fell to 65.8%compared to that at room temperature,showing good thermal stability.
作者
莫福旺
陈秋娟
杨幸玲
胡丽君
韦晓贤
Mo Fuwang;Chen Qiujuan;Yang Xingling;Hu Lijun;Wei Xiaoxian(Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization,Hezhou 542899;College of Materials and Chemical Engineering,Hezhou University,Hezhou 542899)
出处
《化工新型材料》
CAS
CSCD
北大核心
2020年第9期128-132,共5页
New Chemical Materials
基金
广西壮族自治区中青年教师基础能力提升项目(2017KY0653)
贺州学院博士科研启动基金(HZUBS201504)
大学生创新创业训练计划(201711838093)
广西高等教育本科教学改革工程项目(2018JGB318)。
关键词
荧光粉
晶体结构
发光性质
热稳定性
phosphor
crystal structure
luminescence property
thermal stability
