Environmental impact on the excitation path of the red upconversion emission of nanocrystalline NaYF4:Yb3+,Er3+
- The mechanism for red upconversion luminescence of Yb−Er codoped materials is not generally agreed on in the literature. Both two-photon and three-photon processes have been suggested as the main path for red upconversion emission. We have studied β-NaYF4:Yb3+,Er3+ nanoparticles in H2O and D2O, and we propose that the nanoparticle environment is a major factor in the selection of the preferred red upconversion excitation pathway. In H2O, efficient multiphonon relaxation (MPR) promotes the two-photon mechanism through green emitting states, while, in D2O, MPR is less effective and the three-photon path involving back energy transfer to Yb3+ is the dominant mechanism. For the green upconversion emission, our results suggest the common two-photon path through the 4F9/2 energy state in both H2O and D2O.
| Autor*innen: | Iko Hyppänen, Niina Höysniemi, Riika Arppe, Michael Schäferling, Tero Soukka |
|---|---|
| Dokumenttyp: | Zeitschriftenartikel |
| Veröffentlichungsform: | Verlagsliteratur |
| Sprache: | Englisch |
| Titel des übergeordneten Werkes (Englisch): | Journal of Physical Chemistry C |
| Jahr der Erstveröffentlichung: | 2017 |
| Herausgeber (Institution): | American Chemical Society |
| Verlag: | ACS Publications |
| Jahrgang/Band: | 121 |
| Ausgabe/Heft: | 12 |
| Erste Seite: | 6924 |
| Letzte Seite: | 6929 |
| DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
| Freie Schlagwörter: | Excitation intensity; Multiphonon relaxation; Photon upconversion; Three photon excitation |
| DOI: | 10.1021/acs.jpcc.7b01019 |
| URL: | http://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.7b01019 |
| ISSN: | 1932-7447 |
| ISSN: | 1932-7455 |
| Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
| Datum der Freischaltung: | 21.04.2017 |
| Referierte Publikation: | Ja |
| Datum der Eintragung als referierte Publikation: | 28.04.2017 |

