Abstract
White up conversion emission has been observed in sol-gel derived α-Y2Si2O7 nano powders activated with ytterbium and erbium ions when excited with the 950 nm emission of a laser diode. Measurements of the sample emission intensity dependence on the pumping power under atmospheric pressure condition were performed to provide possibly an explanation for the UC mechanism. The emission intensities of each Er3+ transition decreased when the pumping power was increased from 1.7 to 2.5 W with the observation of the bright wide band under atmospheric pressure condition. When the sample was subject to very low pressure at 0.03 mbar and the pumping power was set from 0.9 to 2.5 W, the white emission brightness increased. The CIE coordinates (x, y) for YSYE were found to be (0.330, 0.300 (1.7 W-0.3 mbar)) and (0.339, 0.304 (2.5 W-atmospheric pressure)) under the 950 nm laser diode excitation.
| Original language | English |
|---|---|
| Pages (from-to) | 260-264 |
| Number of pages | 5 |
| Journal | Optical Materials |
| Volume | 46 |
| DOIs | |
| Publication status | Published - 1 Aug 2015 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2015 Elsevier B.V. All rights reserved.
Funding
This study was financially supported by the Scientific Research Projects Unit (BAPKO) of Marmara University with the Project number FEN-B-150513-0170. One of the authors (Murat Erdem) would like to thank the Scientific and Technological Research Council of Turkey (TUBITAK) for its support
| Funders | Funder number |
|---|---|
| Marmara Üniversitesi | FEN-B-150513-0170 |
| Firat University Scientific Research Projects Management Unit |
Keywords
- Sol-gel
- Up-conversion
- Yttrium silicates