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http://cio.repositorioinstitucional.mx/jspui/handle/1002/754| Photoluminescence characterization of porous YAG: Yb3+–Er3+ nanoparticles | |
| HAGGEO DESIRENA ENRRIQUEZ LUIS ARMANDO DIAZ TORRES ELDER DE LA ROSA CRUZ | |
| En Embargo | |
| 30-09-2019 | |
| Atribución-NoComercial-SinDerivadas | |
| Yb3+/Er3+ codoped yttrium aluminium garnet (YAG) porous nanocrystals were prepared by glycolate method assisted with poly-vinyl alcohol (PVA) and urea. The typical cubic structure for YAG was confirmed from XRD with crystallite average size of ~40 nm, calculated from Scherrer formula and corroborated by TEM. Strong green and red upconversion emissions are observed readily with the naked eyes, and the color coordinates were obtained from emission spectra. A theoretical model to calculate CIE coordinate as a function of donor (Yb3+) and acceptors (Er3+) concentration is proposed. The eye-safe near infrared emitted signal and fluorescence lifetime were also measured and results show lifetime as large as 8.5 ms. The maximum energy transfer efficiency from Yb3+ to Er3+ was 72% for 20 mol% of Yb2O3. The proposed mechanisms for signal emitted are explained in terms of direct and energy back transfer processes, and cross relaxation. | |
| 2014-09 | |
| Artículo | |
| CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA | |
| Aparece en las colecciones: | Articulos Arbitrados 2014 |