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Letters to Nature
Nature 420, 800-803 (19 December 2002) | doi:10.1038/nature01217; Received 22 July 2002; Accepted 14 October 2002
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Electroluminescence from single monolayers of nanocrystals in molecular organic devices
Seth Coe1,2,
Wing-Keung Woo2,3,
Moungi Bawendi3
&
Vladimir Bulovi
1
- Laboratory of Organic Optoelectronics, Department of Electrical Engineering and Computer Science,
- Center for Materials Science and Engineering, Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- These authors contributed equally to this work
Correspondence to: Vladimir Bulovi
1 Correspondence and requests for materials should be addressed to V.B. (e-mail: Email: bulovic@mit.edu).
Abstract
The integration of organic and inorganic materials at the nanometre scale into hybrid optoelectronic structures enables active devices1, 2, 3 that combine the diversity of organic materials with the high-performance electronic and optical properties of inorganic nanocrystals4. The optimization of such hybrid devices ultimately depends upon the precise positioning of the functionally distinct materials. Previous studies5, 6 have already emphasized that this is a challenge, owing to the lack of well-developed nanometre-scale fabrication techniques. Here we demonstrate a hybrid light-emitting diode (LED) that combines the ease of processability of organic materials with the narrow-band, efficient luminescence of colloidal quantum dots7 (QDs). To isolate the luminescence processes from charge conduction, we fabricate a quantum-dot LED (QD-LED) that contains only a single monolayer of QDs, sandwiched between two organic thin films. This is achieved by a method that uses material phase segregation between the QD aliphatic capping groups and the aromatic organic materials. In our devices, where QDs function exclusively as lumophores, we observe a 25-fold improvement in luminescence efficiency (1.6 cd A-1 at 2,000 cd m-2) over the best previous QD-LED results5. The reproducibility and precision of our phase-segregation approach suggests that this technique could be widely applicable to the fabrication of other hybrid organic/inorganic devices.
- Laboratory of Organic Optoelectronics, Department of Electrical Engineering and Computer Science,
- Center for Materials Science and Engineering, Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- These authors contributed equally to this work
Correspondence to: Vladimir Bulovi
1 Correspondence and requests for materials should be addressed to V.B. (e-mail: Email: bulovic@mit.edu).
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