Abstract
We successfully fabricated core/shell-type composite QDs based on the ternary-CuInSe 2. For the CuInSe 2/ZnSe core/shell QDs, an enhanced photoluminescence (PL) emission intensity, such as 16% of the photoluminescence quantum yield (PLQY), and a blue-shift in the emission after the ZnSe coating, were observed. The increase in the PLQY was the result of an exchange of the surface capping ligand from the organic hexadecylamine to the inorganic ZnSe and the smoothing of the confining profile due to the alloying. The blue-shift was attributed to the shrinkage of the effective size of the core-CuInSe 2 region due to the partial alloying of the core-CuInSe 2 with the ZnSe-shell around their interfaces. For the inverted core/shell QDs, i.e., the nominally ZnSe/CuIn5Se8 core/shell QDs, they showed a red emission at 619 nm. The emission wavelength is the shortest among the previously reported QDs in Cu-In-Se system
Original language | English |
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Pages (from-to) | 4815-4823 |
Number of pages | 9 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 11 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2011 |
Externally published | Yes |
Keywords
- Colloidal Nanocrystals
- CuInSe
- Luminescence
- Quantum Dot
- Quantum Size Effect
ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics