- AutorIn
- Alexandra Raevskaya
- Dr. Vladimir Lesnyak
- Dr. Danny Haubold
- Dr. Volodymyr Dzhagan
- Dr. Oleksandr Stroyuk
- Prof. Dr. Nikolai Gaponik
- Prof. Dr. Dr.h.c. Dietrich R.T. Zahn
- Prof. Dr. Alexander Eychmüller
- Titel
- A Fine Size Selection of Brightly Luminescent Water-Soluble Ag-In-S and Ag-In-S/ZnS Quantum Dots
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa-226647
- Quellenangabe
- The journal of physical chemistry C, Nanomaterials and interfaces (2017), 121(16). S. 9032-9042. ISSN 1932-7455. DOI: 10.1021/acs.jpcc.7b00849.
- Abstract (EN)
- A size-selected series of water-soluble luminescent Ag–In–S (AIS) and core/shell AIS/ZnS QDs were produced by a precipitation technique. Up to 10–11 fractions of size-selected AIS (AIS/ZnS) QDs emitting in a broad color range from deep-red to bluish-green were isolated with the photoluminescence (PL) quantum yield reaching 47% for intermediate fractions. The size of the isolated AIS (AIS/ZnS) QDs varied from ~2 nm to ~3.5 nm at a roughly constant chemical compo- sition of the particles throughout the fractions as shown by the X-ray photoelectron spectroscopy. The decrease of the mean AIS QD size in consecutive fractions was accompanied by an increase of the structural QD imperfection/disorder as deduced from a notable Urbach absorption “tail” below the fundamental absorption edge. The Urbach increased from 90–100 meV for the largest QDs up to 350 meV for the smallest QDs, indicating a broadening of the distribution of sub-bandgap states. Both the Urbach energy and the PL bandwidth of the size-selected AIS QDs increased with QD size reduction from 3–4 nm to ~2 nm and a distinct correlation was observed between these parameters. A study of size-selected AIS and AIS/ZnS QDs by UV photoelectron spectroscopy on Au and FTO substrates revealed their valence band level EVB at ~6.6 eV (on Au) and ~7 eV (on FTO) and pinned to the Fermi level of conductive substrates resulting in a masking of any possible size- dependence of the valence band edge position.
- Andere Ausgabe
- DOI: 10.1021/acs.jpcc.7b00849
- Link zum Artikel, der zuerst in der Zeitschrift "The journal of physical chemistry C, Nanomaterials and interfaces" erschienen ist.
Link: http://dx.doi.org/10.1021/acs.jpcc.7b00849 - Freie Schlagwörter (DE)
- water-soluble luminescent Ag–In–S (AIS), core/shell AIS/ZnS quantum dots (QDs)
- Freie Schlagwörter (EN)
- water-soluble luminescent Ag–In–S (AIS), core/shell AIS/ZnS quantum dots (QDs)
- Klassifikation (DDC)
- 540
- Klassifikation (RVK)
- VA 1120
- Verlag
- American Chemical Society, Washington DC.
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa-226647
- Veröffentlichungsdatum Qucosa
- 11.08.2017
- Dokumenttyp
- Artikel
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis