CAJ | 학술논문

采用共沉淀法制备了不同Eu3+掺杂浓度的Gd2(WO4)3纳米发光材料.测量了纳米材料样品的X射线衍射谱(XRD)和场发射扫描电镜,对样品的结构和形貌进行了表征.测量了各样品的发射光谱和激发光谱(声子边带光谱),绘制了浓度猝灭曲线,确定了最佳的掺杂浓度为20 mol%.通过声子边带光谱计算了不同掺杂浓度样品的黄昆因子.测量了不同浓度样品的荧光寿命,利用Auzel模型对Eu3+5D0能级荧光寿命数据进行了拟合,确定了5D0能级的固有寿命和猝灭过程中生成的声子数.本文还根据荧光寿命数据计算了Eu3+之间的能量传递速率,确定了能量传递速率与浓度的关系.
채용공침정법제비료불동Eu3+참잡농도적Gd2(WO4)3납미발광재료.측량료납미재료양품적X사선연사보(XRD)화장발사소묘전경,대양품적결구화형모진행료표정.측량료각양품적발사광보화격발광보(성자변대광보),회제료농도졸멸곡선,학정료최가적참잡농도위20 mol%.통과성자변대광보계산료불동참잡농도양품적황곤인자.측량료불동농도양품적형광수명,이용Auzel모형대Eu3+5D0능급형광수명수거진행료의합,학정료5D0능급적고유수명화졸멸과정중생성적성자수.본문환근거형광수명수거계산료Eu3+지간적능량전체속솔,학정료능량전체속솔여농도적관계.
In this paper, Gd2(WO4)3:Eu nanophosphors with different Eu3+concentrations were synthesized through co-precipitation. The crystal structure and morphology of the nanophosphors were characterized by means of XRD and field emission scanning electron microscopy. Emission and excitation spectra (phonon sideband spectra) of each sample were measured, and concentration quenching curves were also drawn. The optimal doping concentration was confirmed to be 20 mol%. Huang-Rhys factor for each sample of different doping concentration was calculated by the phonon sideband spectra. Fluorescence lifetimes of the samples with different Eu3+doping concentrations were measured. By fitting the fluorescence lifetime data of Eu3+ 5D0 level within the Auzel’s model, the intrinsic lifetime for 5D0 level was determined and the generated phonon number in the quenching process was measured. The energy transfer rate of Eu3+ was derived from the fluorescence lifetime data, and the relationship between the energy transfer rate and the concentration was also given.