Fu Yue, Cong Yan, Yang Yang, Xiao Yu, He Yang-yang, Wang Li-mei, Dong Bin
Guang Pu Xue Yu Guang Pu Fen Xi. 2015 Nov;35(11):3032-5.
Under different Eu³⁺ concentration, Eu³⁺ doped CeO₂ was prepared by co-precipitation method, and the structure and luminescent properties were studied through XRD, excitation and emission spectra. The PLE spectrum shows a broad charge- transfer band from 300-400 nm, and a week excitation line at 467 arise from 7F₀--⁵D₂ transition in Eu³⁺. The red emission arise from ⁵D₀--⁷F₁ (592 nm) and ⁵D₀--⁷F₂ transitions of Eu³⁺ has a great increase by high concentration doping under 467 nm excitation. The wavelength at 467 nm is nicely fitting in with the widely applied emission wavelengths of blue LED chips. It is indicated that the CeO₂:Eu³⁺ phosphor emits efficiently red emission under the blue light which makes it possible to create white light from a combination of a blue LED chip.
采用共沉淀法制备了不同铕离子（Eu³⁺）浓度掺杂的Eu³⁺掺杂二氧化铈（CeO₂），并通过X射线衍射（XRD）、激发光谱和发射光谱研究了其结构和发光性能。激发光谱（PLE）显示在300 - 400 nm有一个宽的电荷转移带，467 nm处有一条弱激发线，源于Eu³⁺中7F₀--⁵D₂跃迁。在467 nm激发下，Eu³⁺的⁵D₀--⁷F₁（592 nm）和⁵D₀--⁷F₂跃迁产生的红色发射通过高浓度掺杂有很大增强。467 nm的波长与广泛应用的蓝色发光二极管（LED）芯片的发射波长很好地匹配。结果表明，CeO₂:Eu³⁺荧光粉在蓝光下能有效发射红色光，这使得通过蓝色LED芯片组合产生白光成为可能。
