【作者】 李艳琴； 王育华；

【Author】 Yanqin Li Yuhua Wang (Department of Materials Science,School of Physical Science and Technology,Lanzhou University,Lanzhou, 730000,People’s Republic of China)

【机构】 兰州大学物理科学与技术学院材料科学系；

【摘要】 采用高温固相法首次合成了新型橙黄色长余辉发光材料Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺,采用XRD、荧光光谱、余辉衰减曲线、余辉光谱和热释光曲线对其进行表征。XRD测试表明所制备的Sr₃Al₂O₅Cl₂.Eu²⁺,Tm³⁺为单相。荧光光谱测试表明,该材料的激发光谱为200～450nm的宽带;其发射光谱为主峰位于620nm的宽带谱,属于典型的Eu²⁺的4f⁶5d¹→4f⁷跃迁。其中,没有观测到典型的Tm³⁺的发射峰。在紫外光的激发下,Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺的余辉时间可达4h,余辉初始亮度接近5000mcd/m².余辉光谱的测试表明,该材料的余辉发射光谱与其发射光谱的峰形和峰宽完全一致,表明余辉发射也属于Eu²⁺的4f⁶5d¹→4f⁷跃迁,通过余辉光谱计算其色坐标为（0.52,0.46）,表明余辉颜色为橙黄色。最后,通过对热释光曲线的分析解释了Tm³⁺掺杂显著改善Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺余辉性能的原因。该材料的研制提供了一种新的长余辉发光基质材料,同时丰富了现有长余辉发光材料的余辉颜色。更多还原

【Abstract】 An orange-yellow emitting Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺ material with bright and long-lasting phosphorescence（LLP） has been newly developed.Its photoluminescence properties were investigated by XRD, fluorescence spectra,phosphorescence decay curve,phosphorescence emission spectra and thermoluminescence curves.XRD results indicate that the samples studied are free from impurities.The incorporation of Tm³⁺ into the Sr₃Al₂O₅Cl₂:Eu²⁺ as an auxiliary activator dominates the phosphorescence and thermoluminescence characteristics of the material to a large extent.The emissions in Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺ for both fluorescence and LLP are due to the 5d→4f transitions of Eu²⁺.The orange-yellow phosphorescence with the chromaticity coordination of（0.52,0.46） can persist for nearly 220 min at recognizable intensity level（≥0.32 mcd/m²）. The investigation of LLP material Sr₃Al₂O₅Cl₂:Eu²⁺,Tm³⁺ produces a novel host material for LLP and enriches the color of LLP.It may have potential application in various displays and signing applications.更多还原