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论文类型：期刊论文

发表时间：2012-09-01

发表刊物：CHINESE PHYSICS B

收录刊物：SCIE、EI、ISTIC、Scopus

卷号：21

期号：9

ISSN号：1674-1056

关键字：Yb3+/Dy3+ co-doped Al2O3 nanopowders; non-aqueous sol-gel method; photo- luminescence spectra; up-conversion emission

摘要：Yb3+/Dy3+ co-doped Al2O3 nanopowders have been prepared by the non-aqueous sol gel method and their up-conversion photoluminescence spectra are measured under excitation by a 980-nm semiconductor laser. The results show that there are comparatively abundant spectra of up-conversion emissions centered at 378, 408, 527 and 543, and 663 nm, corresponding to (4)G(9/2) -> H-6(13/2), (4)G(9/2) -> H-6(11/2), I-4(15/2) -> H-6(13/2), and F-4(9/2) -> H-6(11/2) transitions of Dy3+, respectively. Two-photon and three-photon processes are involved in ultraviolet, violet, green, and red up-conversion emissions. The energy transition between Yb3+ and Dy3+ is discussed.