Dan H.K.,Kunming University of Science and Technology |
Dan H.K.,Science and Technology Center |
Zhou D.,Kunming University of Science and Technology |
Zhou D.,Key Laboratory of Advanced Materials in Rare and Precious and Non ferrous Metals |
And 10 more authors.
Materials Research Bulletin | Year: 2016
The effects of Mn2+ ions on the enhancement red upconversion emission intensity of Mn2+/Tm3+/Yb3+ tri-doped transparent glass-ceramics were investigated. The ratio I698nm/I478nm significantly increases about ten-fold with the increase of Mn2+ concentrations up to 4.0 mol.%. The red upconversion emission of Mn2+/Tm3+/Yb3+ tri-doped transparent glass-ceramics is greatly enhanced, due to constitution of the energy transfer bridge. The upconversion mechanism, the energy transfer and back energy transfer processes between the (1G4 → 3H6), (3F2 → 3H6) transitions of Tm3+ ions and the |2F7/2, 4T1〉 → |2F7/2, 6A1〉 transitions of Mn2+-Yb3+ dimer were discussed. © 2015 Elsevier Ltd. All rights reserved. Source
Yan D.,Kunming University of Science and Technology |
Yan D.,Key Laboratory of Advanced Materials in Rare and Precious and Non ferrous Metals |
Yan D.,Key Laboratory of Advanced Materials of Yunnan Province |
Qiu J.,Kunming University of Science and Technology |
And 21 more authors.
Optical Materials Express | Year: 2012
We present firstly the preparation of color tunable Al2Y4O9: Yb, Er inverse opal photonic crystal and influence of photonic bandgap on upconversion emissions of Er3+. The results show that Al2Y4O9: Yb, Er upconversion inverse opals were successfully prepared by a self-assembly technique in combination with a sol-gel method. The intensity of upconversion emission can be tuned by controlling the structure of the inverse opal. Significant suppression of the green or red upconversion emission in the Al2Y4O9: Yb, Er inverse opals was obtained if the photonic band-gap overlaps with the Er3+ ions emission band, resulting in color tunable upconversion Al2Y4O9 phosphors. This research not only realizes the colour modification of upconversion emission, but also opens the opportunity to control the propagation of photons. © 2012 Optical Society of America. Source