Abstract
Cooperative emission has been observed in sol-gel derived nano-powders doped with yitterbium 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 cooperative emission mechanism. The emission intensities of each nano-powder increased when the pressure was increased from 0.01 mbar to 1 atm with the observation of the bright blue emission. When the powders were subject to very low pressure at 0.01 mbar, the blue emission intensities decreased and green emission intensities increased. The CIE coordinates (x, y) for YSY1 were found to be (0.187, 0.196) under 1 atm. with a color rendering index (CRI) of 67 under the 950 nm laser diode excitation.
| Original language | English |
|---|---|
| Pages (from-to) | 1501-1506 |
| Number of pages | 6 |
| Journal | Ceramics International |
| Volume | 42 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2016 |
Bibliographical note
Publisher Copyright:© 2015 Elsevier Ltd and Techna Group S.r.l. 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
- Cooperative emission
- Pressure effect
- Sol-gel
- Yttrium silicate