Insights into different photoluminescence mechanisms of binary and ternary aqueous nanocrystals from the temperature dependence: A case study of CdSe and Ag-In-S

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Oleksandr Stroyuk - , Chemnitz University of Technology, National Academy of Sciences of Ukraine (Author)
  • Volodymyr Dzhagan - , Kyiv National Taras Shevchenko University (Author)
  • Alexandra Raevskaya - , TUD Dresden University of Technology (Author)
  • Felix Spranger - , TUD Dresden University of Technology (Author)
  • Nikolai Gaponik - , TUD Dresden University of Technology (Author)
  • Dietrich R. T. Zahn - , Chemnitz University of Technology (Author)

Abstract

A comparative study of the temperature dependences of the photoluminescence (PL) of aqueous CdSe and silver-indium-sulfide (AIS) nanocrystals (NCs) in a broad range of 10-310 K is reported. Gelatin-incorporated CdSe (and core/shell CdSe/ZnS) NCs reveal both direct (excitonic) and trap-state-mediated PL components with different temperature dependences of the PL band maximum and spectral width. Glutathione-capped AIS (and core/shell AIS/ZnS) NCs emit a single broad PL band resembling the trap-related PL of CdSe NCs but showing nevertheless a temperature PL dependence typical for excitonic PL. In combination with previously reported results, these special features allow the PL emission of ternary AIS (AIS/ZnS) NCs to be explained based on the recombination of self-trapped excitons.

Details

Original languageEnglish
Article number116630
Number of pages8
JournalJournal of luminescence
Volume215
Publication statusPublished - Nov 2019
Peer-reviewedYes
Externally publishedYes

External IDs

Scopus 85069741306
ORCID /0000-0002-8827-2881/work/142232977

Keywords

Keywords

  • Cadmium selenide, Silver indium sulfide, Quantum dots, Self-trapped exciton, SELF-TRAPPED EXCITONS, WHITE-LIGHT EMISSION, QUANTUM DOTS, SEMICONDUCTOR NANOCRYSTALS, LUMINESCENCE, NANOPARTICLES, ENERGY, SURFACE, FLUORESCENCE