Ln(3+) (Ln = Eu, Dy) - doped Sr2CeO4 fine phosphor particles: Wet chemical preparation, energy transfer and tunable luminescence


The Sr2CeO4:Ln(3+) (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 Ln(3+) into Sr2CeO4 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 Sr2CeO4, with the increase of Eu(3+-)doping concentration, the blue light emission band with the maximum at 468 nm originating from a Ce4+ -> O2- charge transfer of the host decreases obviously and the characteristic red light emission of Eu3+ (D-5(0)-> F-7(2) transition at 618 nm) is enhanced gradually. Simultaneously, the fluorescent lifetime of the broadband emission of Sr2CeO4 decreases with the doping of Eu3+, indicating an efficient energy transfer from the host to the doping Eu3+ ions. The energy transfer efficiency from the host to Eu3+ was investigated in detail, and the emitting color of Sr2CeO4:Eu3+ can be easily tuned from blue to red by varying the doping concentration of Eu3+ ions. Moreover, the luminescence of Dy3+-doped Sr2CeO4 was also studied. Similar energy transfer phenomenon can be observed, and the incorporation of Dy3+ into Sr2CeO4 host leads to the characteristic emission of F-4(9/2) -> H-6(15/2) (488 nm, blue light) and F-4(9/2) -> H-6(13/2) (574 nm, yellow light) of Dy3+. The Sr2CeO4:Ln(3+) fine particles with tunable luminescence are quite beneficial for its potential applications in the optoelectronic fields. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.



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Gao, N; Yang, YF; Shi, SK; Wang, JY; Wang, SP; Li, JB; Fu, LS



Project supported by National Natural Science Foundation of China (51972097).

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