Ln³⁺（Ln=Eu,Dy）-doped Sr₂CeO₄ fine phosphor particles:Wet chemical preparation,energy transfer and tunable luminescence

Na Gao¹，Yanfei Yang¹，Shikao Shi¹，Jiye Wang¹，Shuping Wang¹，Jibiao Li¹，Lianshe Fu²

1. Key Laboratory of Inorganic Nanomaterials of Hebei Province,College of Chemistry and Materials Science,Hebei Normal University2. Physics Department and CICECO-Aveiro Institute of Materials,University of Aveiro

摘 要：The Sr₂ CeO₄:Ln³⁺（Ln=Eu,Dy） fine phosphor particles were prepared by a facile wet chemical approach,in which the consecutive hydrothermal-combustion reaction was performed.The doping of Ln3+into Sr₂ CeO₄ has little influence on the structure of host,and the as-prepared samples display wellcrystallized spherical or elliptical shape with an average particle size at about 100-200 nm.For Eu³⁺ions-doped Sr₂ CeO₄,with the increase of Eu³⁺-doping concentration,the blue light emission band with the maximum at 468 nm originating from a Ce⁴⁺→O^2-charge transfer of the host decreases obviously and the characteristic red light emission of Eu³⁺（⁵ D₀→⁷ F₂ transition at 618 nm） is enhanced gradually.Simultaneously,the fluorescent lifetime of the broadband emission of Sr₂ CeO₄ decreases with the doping of Eu³⁺,indicating an efficient energy transfer from the host to the doping Eu3+ions.The ene rgy transfer efficiency from the host to Eu3+was investigated in detail,and the emitting color of Sr₂ CeO₄:Eu³⁺ can be easily tuned from blue to red by varying the doping concentration of Eu³⁺ ions.Moreover,the luminescence of Dy³⁺-doped Sr₂ CeO₄ was also studied.Similar energy transfer pheno menon can be observed,and the incorporation of Dy³⁺ into Sr₂ CeO₄ host leads to the characteristic emission of ⁴ F_9/2→⁶ H_15/2（488 nm,blue light） and ⁴ F_9/2→⁶ H_13/2（574 nm,yellow light） of Dy³⁺.The Sr₂ CeO₄:Ln3+fine particles with tunable luminescence are quite beneficial for its potential applications in the optoelectronic fields.

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