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.






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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