摘要
采用高温固相法合成了3/2-Al6Si2O13/蒙脱土∶Eu,Al复相基质蓝色发光材料。探讨基质中Al6Si2O13与蒙脱土比例、激活剂Eu浓度以及Al掺杂浓度对发光性能的影响。实验结果表明,相对于Al6Si2O13单一体系,复相体系的发射光谱产生红移,Stokes位移和FWHM均变大,发光强度显著增强,Eu的最佳含量为8mol%。在350nm激发下,样品的发射光谱为主峰位于450nm及位于483nm的肩峰组成的宽带峰,对应于Eu2+的4f65d→4f7宽带发射。Eu2+-Eu2+之间出现能量传递,能量传递临界距离Rc为1.75nm,传递方式为电多级相互作用。Al可增加基质禁带宽度,掺杂Al的量为5mol%的样品发光性能最好。
Blue phosphors of di-phase matrix of Al6 Si2O13/ montmorillonite： Eu, Al were synthesized by a solid state reaction. The effects of the ratio between Al6 Si2 O13 and montmorillonite and compositions of Eu and Al on the luminescent properties were investigated, respectively. The results reveal that emission spectrum of the di-phase matrix demonstrates a red-shift, a luminous intensity increase and a Stokes shift as well as a widened FWHM. It is found that the optimum content of Eu is 8 tool %. Under the excitation of 350nm, the emission spectrum of phosphors consist of two emission bands （at 450nm and 483nm respectively）, which are ascribed to the 4f65d→4f7 transition of Eu^2＋ ions. The mechanism analysis shows that the energy transfer occur between Eu^2＋-EC＋ by an electric multipolar interaction and the critical distance for energy transfer （Re） is considered about 1.75nm. The band gap could increase with adding Al, and the best luminescence performance is found with Al doping for 5mol%.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2015年第2期193-196,256,共5页
Journal of Materials Science and Engineering
