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http://cio.repositorioinstitucional.mx/jspui/handle/1002/595| UP-CONVERTED LUMINESCENT PROPERTIES OF RARE-EARTH DOPED ZrO2 NANOCRYSTALS | |
| David Solís | |
| ELDER DE LA ROSA | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| ER, YB, HO, TM, UP-CONVERSION, ZrO2, EMISSION TUNNING, LUMINESCENCE | |
| "ZrO2 nanocrystalline samples doped with different concentrations of Erbium, Holmium and Thulium ions, using Ytterbium as a sensitizer, were prepared by sol-gel and solvothermal chemical methods and annealed applying determined temperature routes as well as surface supplemental modifiers. Concentration ranges for each ion were established for producing high emission intensity samples, along with an analysis of the crystalline structure and crystallite size of the host. The structural and morphological characterization showed that the introduction of different ion concentrations affect the crystalline structure stability. The samples were pumped at 970 nm with a semiconductor laser source, thus the up-converted luminescence and the change in the peak intensities of the measured bands were studied. According to experimental results, there is a strong influence of both Yb3+ and Er3+ ion concentrations over the red/green ratio mainly due to the cross-relaxation, process that is theoretically interpreted in this work. Green UC emission from Ho3+ presented the highest efficiency, with a decay constant of 360 μs, for the 2/0.001 mol% Yb/Ho composition. This yields a chromatic coordinate of (0.289, 0.699) with a maximum luminance of 8.7 × 10−3 lm. The blue UC emission from Tm3+ is presumably and favorably affected by similar crossrelaxation channel as well. The strong increase in blue signal for very low concentration of Tm3+ can be attributed to the reduction of inter-ionic cluster interactions. It is clear that the excitation dynamics is a relevant part on the luminescent processes and the effect by material preparation. From the results, a procedure for color emission tuning is proposed, as well as the feasibility of obtaining white light emission from a combination of several rare-earth ions concentrations. The viability of strong and tunable color emission signals make these nanocrystals very attractive for luminescence labeling in biomedical applications." | |
| 2010-12 | |
| Tesis de doctorado | |
| Inglés | |
| León, Guanajuato | |
| Público en general | |
| Solís Santana, (2010)."Up-converted Luminescent Properties of Rare-earth doped ZrO2 Nanocrystals". Tesis de Doctorado en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 173 pp. | |
| ÓPTICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | DOCTORADO EN CIENCIAS (ÓPTICA) |
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