发光学报, 2017, 38 (11): 1429, 网络出版: 2017-12-25
通过改变基质阳离子半径使O2-→Eu3+电荷迁移带红移
Red shift of 2-→Eu3+ Charge Transfer Band by Changing The Host Cationic Radiu
摘要
采用高温固相法在1 300 ℃合成了A0.98Nb2O6∶Eu0.02(A=Ca,Sr,Ba)荧光粉。X射线衍射(XRD)的结果表明烧结后得到的产物为纯相。利用稳态荧光光谱(PL)和漫反射光谱(DRS)对A0.98Nb2O6∶Eu0.02(A=Ca,Sr,Ba)的发光性质进行了研究。结果表明A0.98Nb2O6∶Eu0.02(A=Ca,Sr,Ba)荧光粉可以发射Eu3+的特征红光, 光强度按CaNb2O6>SrNb2O6>BaNb2O6从大到小排列。激发光谱中可以观察到Eu3+离子的电荷转移跃迁(CT)和f-f跃迁吸收。其中CT吸收峰因基质阳离子半径的增大而发生了较大程度的红移, 从270 nm红移到了330 nm。
Abstract
The phosphors with general molecular formula A0.98Nb2O6∶Eu0.02(A=Ca, Sr, Ba) were prepared by the high-temperature solid state reaction technique. X-ray diffraction (XRD) results reveal that the obtained products are pure phase. The luminescence properties of A0.98Nb2O6∶Eu0.02(A=Ca, Sr, Ba) were investigated by photoluminescence spectra(PL) and diffuse reflection spectra(DRS). A0.98Nb2O6∶Eu0.02(A=Ca, Sr, Ba) phosphors can exhibit the characteristic red emission of Eu3+, and PL intensities of A0.98Nb2O6∶Eu0.02are in the order of CaNb2O6>SrNb2O6>BaNb2O6. The charge transfer transition(CT) and f-f transition absorption of Eu3 + can be observed in the excitation spectra. With the increase of the host cationic radius, the CT band shows large red shift from 270 to 330 nm.
王洪杰, 吕玲玲, 张粟, 冯婧, 庞然, 姜丽宏, 李达, 李成宇. 通过改变基质阳离子半径使O2-→Eu3+电荷迁移带红移[J]. 发光学报, 2017, 38(11): 1429. WANG Hong-jie, LYU Ling-ling, ZHANG Su, FENG Jing, PANG Ran, JIANG Li-hong, LI Da, LI Cheng-yu. Red shift of 2-→Eu3+ Charge Transfer Band by Changing The Host Cationic Radiu[J]. Chinese Journal of Luminescence, 2017, 38(11): 1429.