- Single particle imaging of upconversion nanoparticles (UCNPs) has typically been realized using hexagonal (β) phase lanthanide-doped sodium yttrium fluoride (NaYF4) materials, the upconversion luminescence (UCL) of which saturates at power densities (P) of several hundred W cm−2 under 980 nm nearinfrared (NIR) excitation. Cubic (α) phase UCNPs have been mostly neglected because of their commonly observed lower UCL efficiency at comparable P in ensemble level studies. Here, we describe a set of sub-15 nm ytterbium-enriched α-NaYbF4:Er3+@CaF2 core/shell UCNPs doped with varying Er3+ concentrations (5–25%), studied over a wide P range of ∼8–105 W cm−2, which emit intense UCL even at a low P of 10 W cm−2 and also saturate at relatively low P. The highest upconversion quantum yield (ΦUC) and the highest particle brightness were obtained for an Er3+ dopant concentration of 12%, reaching the highest ΦUC of 0.77% at a saturation power density (Psat) of 110 W cm−2. These 12%Er3+-dopedSingle particle imaging of upconversion nanoparticles (UCNPs) has typically been realized using hexagonal (β) phase lanthanide-doped sodium yttrium fluoride (NaYF4) materials, the upconversion luminescence (UCL) of which saturates at power densities (P) of several hundred W cm−2 under 980 nm nearinfrared (NIR) excitation. Cubic (α) phase UCNPs have been mostly neglected because of their commonly observed lower UCL efficiency at comparable P in ensemble level studies. Here, we describe a set of sub-15 nm ytterbium-enriched α-NaYbF4:Er3+@CaF2 core/shell UCNPs doped with varying Er3+ concentrations (5–25%), studied over a wide P range of ∼8–105 W cm−2, which emit intense UCL even at a low P of 10 W cm−2 and also saturate at relatively low P. The highest upconversion quantum yield (ΦUC) and the highest particle brightness were obtained for an Er3+ dopant concentration of 12%, reaching the highest ΦUC of 0.77% at a saturation power density (Psat) of 110 W cm−2. These 12%Er3+-doped core/shell UCNPs were also the brightest UCNPs among this series under microscopic conditions at high P of ∼102–105 W cm−2 as demonstrated by imaging studies at the single particle level. Our results underline the potential applicability of the described sub-15 nm cubic-phase core/shell UCNPs for ensemble- and single particle-
level bioimaging.…
MetadatenAutor*innen: | M. Tan, Melissa-Jane Monks, D. Huang, Y. Meng, X. Chen, Y Zhou, S.-F. Lom, Christian WürthORCiD, Ute Resch-GengerORCiD, G. Chen |
---|
Dokumenttyp: | Zeitschriftenartikel |
---|
Veröffentlichungsform: | Verlagsliteratur |
---|
Sprache: | Englisch |
---|
Titel des übergeordneten Werkes (Englisch): | Royal Society of Chemistry |
---|
Jahr der Erstveröffentlichung: | 2020 |
---|
Organisationseinheit der BAM: | 1 Analytische Chemie; Referenzmaterialien |
---|
| 1 Analytische Chemie; Referenzmaterialien / 1.2 Biophotonik |
---|
Verlag: | Nanoscale |
---|
Jahrgang/Band: | 12 |
---|
Ausgabe/Heft: | 19 |
---|
Erste Seite: | 10592 |
---|
Letzte Seite: | 10599 |
---|
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
---|
| Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
---|
Freie Schlagwörter: | Brightness; Lanthanide; Lifetime; Nano; Nanomaterial; Photoluminescence; Photophysics; Quantum yield; Sensor; Single particle; Surface chemistry; Upconversion nanoparticle |
---|
Themenfelder/Aktivitätsfelder der BAM: | Chemie und Prozesstechnik |
---|
| Material |
---|
DOI: | 10.1039/d0nr02172e |
---|
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
---|
Datum der Freischaltung: | 22.06.2020 |
---|
Referierte Publikation: | Ja |
---|
Datum der Eintragung als referierte Publikation: | 22.06.2020 |
---|