| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1486916 | Materials Research Bulletin | 2016 | 4 Pages |
•An efficient Ba5Zn4Y8O21:Er3+,Yb3+ up-conversion phosphor was synthesized.•1550 nm LD with great penetrability was used for luminescence research.•Much stronger red emission with great color purity and stability was obtained.•The intensity ratio of red and green emission can reach 62.28.
A novel Ba5Zn4Y8O21:Er3+,Yb3+ up-conversion phosphor was synthesized via solid-state reaction method. The up-conversion luminescence properties of the phosphor excited by 1550 nm laser diode were investigated. Results showed that the characteristic emission peaks of Er3+ were located at 530, 550, 675, and 810 nm, which correspond to the transitions of 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, 4F9/2 → 4I15/2, and 4I9/2 → 4I15/2, respectively. The up-conversion mechanisms were systematically studied through concentration and laser power dependence of the up-converted emissions. An evident tuning effect of Yb3+ on the luminescence of the phosphor was observed. An efficient red emission with high purity was obtained through the Er3+ → Yb3+ → Er3+ energy transfer process, and the intensity ratio of the red and green emissions could reach 62.28. Therefore, Ba5Zn4Y8O21:Er3+,Yb3+ can be an excellent up-conversion red emitter.
Graphical abstractHighly efficient and stable oxide up-conversion materials, especially the materials with high-purity red, green or blue up-conversion emission, can adequately meet the demand for many applications, such as phosphors, up-conversion lasers, and solar cells. In this study, a novel Ba5Zn4Y8O21:Er3+,Yb3+ up-conversion phosphor was synthesized by solid-state reaction method. The up-conversion luminescence properties of the phosphor under 1550 nm (so-called eye-safe wavelength) excitation were researched in detail for the first time. The phosphor exhibits extremely weak green emission and a much stronger red emission with great color purity and stability. The intensity ratio of red and green emission can reach 62.28. These results indicate that the Ba5Zn4Y8O21:Er3+,Yb3+ can be an excellent up-conversion red emitter. Moreover, the obtained results can be used as theoretical and experimental basis for the application of up-conversion luminescence caused by 1550 nm excitation.Figure optionsDownload full-size imageDownload as PowerPoint slide
