Highly Emissive and Color‐Tunable CuInS 2 ‐Based Colloidal Semiconductor Nanocrystals: Off‐Stoichiometry Effects and Improved Electroluminescence Performance
The off‐stoichiometry effects and gram‐scale production of luminescent CuInS 2 ‐based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS 2 nanocrystals can be significantly influenced by control...
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Veröffentlicht in: | Advanced functional materials 2012-05, Vol.22 (10), p.2081-2088 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | The off‐stoichiometry effects and gram‐scale production of luminescent CuInS
2
‐based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS
2
nanocrystals can be significantly influenced by controlling their [Cu]/[In] molar ratio. A simple model adapted from the bulk materials is proposed to explain their off‐stoichiometry effects. Highly emissive and color‐tunable CuInS
2
‐based NCs are prepared by a combination of [Cu]/[In] molar ratio optimization, ZnS shell coating, and CuInS
2
–ZnS alloying. The method is simple, hassle‐free, and easily scalable to fabricate tens of grams of nanocrystal powders with photoluminescence quantum yields up to around 65%. Furthermore, the performance of high‐quality CuInS
2
‐based NCs in electroluminescence devices is examined. These devices have lower turn‐on voltages of around 5 V, brighter luminance up to approximately 2100 cd m
−2
and improved injection efficiency of around 0.3 lm W
−1
(at 100 cd m
−2
) in comparison to recent reports. |
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ISSN: | 1616-301X 1616-3028 |
DOI: | 10.1002/adfm.201102496 |