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http://cio.repositorioinstitucional.mx/jspui/handle/1002/346| LUMINESCENCE PROPERTIES OF ZRO2: YB3+-ER3+ NANOCRYSTALS | |
| David Solís | |
| ELDER DE LA ROSA | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| NANOCRYSTALS, NANOPARTICLES, LUMINESCENCE PROPERTIES, SYNTHESIS AND CHARACTERIZATION METHODS | |
| "Sixteen ZrO2 nanocrystalline samples, single and co-doped, with different concentrations of Erbium and Ytterbium ions were synthesized by sol-gel method and annealed for 5h at 1000ºC. ZrO2: The strongest measured Yb3+ (2%), Er3+ (1%) co-doped sample presented 100% tetragonal phase with a crystallite size of ~ 78nm. The structural and morphological characterization showed that the introduction of different ion concentrations affect the crystalline structure stability. The samples were pumped at 968nm with a semiconductor laser source. The up-converted luminescence properties and the change in the peak intensities of the measured green and red bands were studied. These bands can be ascribed to the 2H11/2 + 4S3/2 Æ 4I15/2 and 4F9/2 Æ 4I15/2 Erbium transitions. With this research work it is expected to have control of the intensity variations of the peaks by changing the Yb3+ and Er3+ dopant concentrations. Thus, the strongest red emission signal was obtained for the ZrO2: Yb3+ (4%), Er3+ (1%) codoped sample and the red and green emission bands had a relationship of 636:100. The ZrO2: Yb3+ (10%), Er3+ (1%) sample was suitable for almost pure red emission, with a ratio value of 13.56 times the green emission. Unfortunately the total emission was 80% weaker compared with the strongest measured ZrO2: Yb3+ (2%), Er3+ (1%) sample. In co-doped samples the red/green ratio is dominated by cross relaxation (CR) process, i.e. (2H11/2 + 4S3/2 Æ 4I9/2) + (4I15/2 Æ 4I13/2). For the red enhancement we found that the dopant concentration ratio value was not unique, that is, we found that more than one dopant concentration value ratio for different red enhancement. Therefore we proved that it is possible to control the red/green emission ratio in ZrO2:Yb3+, Er3+ nanophosphors and get enhancement of the red emission." | |
| 2006-08 | |
| Tesis de maestría | |
| Inglés | |
| León, Guanajuato | |
| Público en general | |
| Solís Santana, (2006). "Luminescence Properties of ZrO2:Yb3+– Er3+ Nanocrystals". Tesis de Maestría en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 106 pp. | |
| ÓPTICA | |
| Aparece en las colecciones: | MAESTRIA EN CIENCIAS (ÓPTICA) |
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| 11451.pdf | Texto completo/Full text | 2.35 MB | Adobe PDF | Visualizar/Abrir |