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

• 作者: Jibiao Li Jiye Wang Lianshe Fu Na Gao Shikao Shi Shuping Wang Yanfei Yang
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 1273-1280
• 页数: 8页
• 语种: 英文

摘要

The Sr2CeO4: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 Sr2CeO4 has little influence on the structure of host, and the as-prepared samples display well-crystallized spherical or elliptical shape with an average particle size at about 100-200 nm. For Eu3+ions-doped Sr2CeO4, with the increase of Eu3+-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+(5D0/7F2 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 lumi-nescence 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 4F9/2 / 6H15/2 (488 nm, blue light) and 4F9/2/ 6H13/2 (574 nm, yellow light) of Dy3+. The Sr2CeO4:Ln3+fine particles with tunable luminescence are quite beneficial for its potential applications in the optoelectronic fields. ? 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.