Effect of Yb3+ concentration on Er3+ luminescence properties of sol-gelderived silica-alumina xerogels
K. Tran Ngoc , H. Pham Thanh , C. Nguyen Duc , C. Armellini , A. Chiasera , M. Ferrari , Y. Jestin , M. Montagna , E. Moser , S. Pelli , G. C. Righini
Optoelectronics Letters ›› 2006, Vol. 2 ›› Issue (5) : 354 -357.
Effect of Yb3+ concentration on Er3+ luminescence properties of sol-gelderived silica-alumina xerogels
Er3+ / Yb3+ co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm. The Yb/Si content was varied from 0 to 4 000 ppm Densification of the samples was achieved by thermal treatment in air at 950 °C for 120 hours with a heating rate 0.1 °C/min. Photoluminescence spectroscopy was used to obtain information about the effective excitation efficiency of Er3+ ions by co-doping with Yb3+ ions. The infrared-to-visible up-conversion luminescence has been investigated upon continuous wave excitation at 980 nm. The samples exhibit red, green and blue up-conversion emission. It is found that the intensity of up-conversion luminescence increases with increasing Yb3+ doping concentration. An opposite behavior is observed for the4l13/2 luminescence of the Er3+ ions.
| [1] |
|
| [2] |
S. Sakka, Handbook of Sol-Gel Science and Technology Processing, Characterization and Applications, Kluwer Acad. Publ, 2005. |
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
/
| 〈 |
|
〉 |