[Spectroscopic Properties of CeO₂: Eu³⁺ for White LEDs]

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.