【作者】 洪广言； 尤洪鹏； 陈四海；

【Author】 HONG Guang-yang;YOU Hong-peng;CHEN Si-hai Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022; Huazhong Science and Technology University, Wuhan, 430074, China

【机构】 中国科学院长春应用化学研究所稀土化学与物理开放实验室； 华中理工大学；

【摘要】 采用固相反应法合成了InBO₃:Re（Re=Eu,Tb,Ce）,研究了InBO₃基质中稀土离子的光谱特性,观察到电荷迁移带位于255 nm附近,Eu³⁺离子在InBO₃ 中产生极强的⁵D₀→⁷F₁ 的跃迁表明Eu³⁺离子在该基质中占据对称性格位。Tb³⁺的4f-5d 允许跃迁位于240 nm附近,而4f-5d 禁戒跃迁位于267 nm附近,Tb³⁺离子呈现出极强的⁵D₄→⁷F₅ 发射。Ce³⁺离子在InBO₃ 中不发光。更多还原

【Abstract】 InBO₃: Re （Re = Eu, Tb, Ce） phosphors were synthesized by heating at a optimum temperature of 1200℃ for4 hours. The investigation on the excitation and emission spectra of Eu³⁺ ions indicate that the charge transfer band is atabout 255 nm and strongest emission line at about 589 nm under 255 nm excitation, indicating that Eu³⁺ ions occupythe central symmetry site. The excitation spectrum of the ⁵D₄→⁷F₅ emission consists of broad bands peaking at about240 nm, 267nm and lines below 300 nm. The broad bands peaking at 240 nm and 267 nm are ascribed to the 4f-5dtransition of Tb³⁺ ions. The lines correspond to the absorption of the for bidden f-f transitions. The emission spectrumunder 240 nm excitation consists of four groups of emission lines located at about 485 nm, 543 nm, 586 nm and 620nm. The four groups are due to the ⁵D₄→⁷F_J （J = 6, 5, 4, 3） transitions, respectively. The Ce³⁺ ions do not luminesce inInBO₃.更多还原