| dc.creator | HAGGEO DESIRENA ENRRIQUEZ | |
| dc.creator | LUIS ARMANDO DIAZ TORRES | |
| dc.creator | ELDER DE LA ROSA CRUZ | |
| dc.date | 2014-09 | |
| dc.date | info:eu-repo/date/embargoEnd/2019-09-30 | |
| dc.date.accessioned | 2023-07-21T15:15:09Z | |
| dc.date.available | 2023-07-21T15:15:09Z | |
| dc.identifier | http://cio.repositorioinstitucional.mx/jspui/handle/1002/754 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7725533 | |
| dc.description | 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. | |
| dc.format | application/pdf | |
| dc.rights | info:eu-repo/semantics/embargoedAccess | |
| dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0 | |
| dc.subject | info:eu-repo/classification/cti/1 | |
| dc.subject | info:eu-repo/classification/cti/1 | |
| dc.title | Photoluminescence characterization of porous YAG: Yb3+–Er3+ nanoparticles | |
| dc.type | info:eu-repo/semantics/article | |
