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The characteristic saturation phenomenon of upconversion luminescence in holmium–ytterbium-co-doped oxyfluoride glass Ho(0.1)Yb(5):FOG
The upconversion luminescence of holmium Ho 3+ ion sensitized by ytterbium Yb 3+ ion in Ho 3+Yb 3+-co-doped oxyfluoride glass Ho(0.1)Yb(5):FOG is investigated in this paper. A plenty of upconversion luminescence lines are measured out. The upconversion mechanism of Ho(0.1)Yb(5):FOG, when excited by...
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Published in: | Physica. B, Condensed matter Condensed matter, 2008-11, Vol.403 (21), p.3847-3852 |
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Main Authors: | , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The upconversion luminescence of holmium Ho
3+ ion sensitized by ytterbium Yb
3+ ion in Ho
3+Yb
3+-co-doped oxyfluoride glass Ho(0.1)Yb(5):FOG is investigated in this paper. A plenty of upconversion luminescence lines are measured out. The upconversion mechanism of Ho(0.1)Yb(5):FOG, when excited by 960
nm laser, is the energy transfer from Yb
3+ to Ho
3+ ion. A very weak 795.5
nm common photoemission fluorescence is detected, which is recognized as the
5I
4→
5I
8 fluorescence transition based on careful measurement, calculation and analysis. And moreover, a novel characteristic upconversion luminescence saturation phenomenon is found. It is that the log
F–log
P curve of upconversion fluorescence vs. pumping laser power is a straight line, and meanwhile the slopes of these double-logarithmic
F–
P plots are smaller than normal multi-photon relation clearly. When pumping laser spot is increased, the slopes of these double logarithmic
F–
P plots could be enhanced noticeably from small value to near the normal multi-photon relation value. The mechanism of this characteristic saturation phenomenon is the energy expansion resulted from energy resonant migration among Yb
3+ ions. |
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ISSN: | 0921-4526 1873-2135 |
DOI: | 10.1016/j.physb.2008.05.003 |