摘要
采用溶胶-凝胶法成功制备出系列Eu^(3+)掺杂和Li^(+)、Eu^(3+)共掺杂Gd_(2)ZnTiO_(6)红色荧光粉,并研究Li^(+)、Eu^(3+)掺杂对样品的晶体结构、微观形貌及发光性能的影响。结果显示,所制备的Gd_(2)ZnTiO_(6)∶Eu^(3+),Li^(+)(GZT∶Eu^(3+),Li^(+))荧光粉为双钙钛矿结构,属于单斜晶系(空间群:P2_(1)/n),大小为10μm的无规则形状的颗粒。在395 nm近紫外光的激发下,GZT∶Eu^(3+)的发射光谱展示出典型的Eu^(3+)线状特征光谱,发射峰中心位于615 nm处,归属于Eu^(3+)的^(5)D_(0)→^(7)F_(2)跃迁。Eu^(3+)的最佳掺杂浓度为0.07(摩尔分数),样品显示明显的浓度猝灭效应,其机制为电偶极子-电偶极子(d-d)相互作用。此外,研究还发现,Li^(+)掺杂对样品的晶体结构、微观形貌没有影响,但是一定量的Li^(+)掺杂可以显著增强样品的荧光强度。当Li^(+)浓度为0.05时,荧光粉发射主峰强度增强程度最大,提高至原来的4.3倍,说明通过Li^(+)、Eu^(3+)共掺杂可以获得高亮度的GZT红色荧光粉。GZT∶0.14Eu^(3+),0.05Li^(+)荧光粉的CIE色坐标为(0.6311,0.3753)与标准红光色坐标(0.670,0.330)较为接近,是一种潜在的LED用红色荧光粉。
A series of Eu^(3+)doped and Li^(+),Eu^(3+)co-doped Gd_(2)ZnTiO_(6)(GZT)red-emitting phosphors were successfully prepared by sol-gel method.The effects of Li^(+)and Eu^(3+)ions doping on the crystal structure,microstructure and luminescent properties of the samples were studied.Results show that the obtained double perovskite Gd_(2)ZnTiO_(6)∶Li^(+),Eu^(3+)(GZT∶Li^(+),Eu^(3+))phosphors crystallized in the monoclinic space group P2_(1)/n and are composed of irregular particles with the size of 10μm.Under the excitation of 395 nm near ultraviolet light,the emission spectrum of GZT∶Eu^(3+)shows a typical linear characteristic spectrum of Eu^(3+)ions.The center position of the emission peak is located at 615 nm,which belongs to the ^(5)D_(0)→^(7)F_(2) transition of Eu^(3+).The optimum doping concentration of Eu^(3+)is 0.07(mole fraction).The obtained samples show obvious concentration quenching effect,and its mechanism can be identified as the electric dipole-dipole interactions(d-d).In addition,it is also found that Li^(+)doping has no effect on the crystal structure and micro morphology of the samples,but a certain amount of Li^(+)doping can significantly enhance the fluorescence intensity of the samples.When the concentration of Li^(+)is 0.05,the intensity of the main emission peak of the phosphor is the largest,which is 4.3 times of the original,indicating that high brightness GZT red-emitting phosphor can be obtained by co-doping Li^(+)and Eu^(3+).The CIE color coordinates of GZT∶0.14Eu^(3+),0.05Li^(+)phosphor is located at(0.6311,0.3753)close to the standard red color coordinates(0.670,0.330),which is a potential red-emitting phosphor for LED.
作者
张王曦月
周琦
周恒为
蒋小康
ZHANG Wangxiyue;ZHOU Qi;ZHOU Hengwei;JIANG Xiaokang(Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics, College of Physical Science and Technology, Yili Normal University, Yining 835000, China)
出处
《人工晶体学报》
CAS
北大核心
2021年第12期2269-2275,2331,共8页
Journal of Synthetic Crystals
基金
新疆维吾尔自治区高校科研计划(XJEDU2017S049)
伊犁师范大学科研项目(2021YSYB101)。
