Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-09-01

Journal: CHINESE PHYSICS B

Included Journals: Scopus、ISTIC、EI、SCIE

Volume: 21

Issue: 9

ISSN: 1674-1056

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

Abstract: 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.