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Sakura, Japan

Ghosh B.,Japan International Center for Materials Nanoarchitectonics | Masuda Y.,Japan National Institute of Advanced Industrial Science and Technology | Wakayama Y.,Japan International Center for Materials Nanoarchitectonics | Imanaka Y.,Japan National Institute of Materials Science | And 9 more authors.
Advanced Functional Materials | Year: 2014

A novel design of white light emitting diodes (WLEDs) emerges to meet the growing global demand for resource sustainability while preserving health and environment. To achieve this goal, a facile method is developed for the chemical synthesis of a luminescent silicon nanocrystal (ncSi) with a large Stokes shift between absorption and emission. The WLED is prepared by a simple spin-coating method, and contains a hybrid-bilayer of the ncSi and luminescent polymer in its device active region. Interestingly, a well-controlled ultrathin ncSi layer on the polymer makes possible to recombine electrons and holes in both layers, respectively. Combining red and blue-green lights, emitted from the ncSi and the polymer layers, respectively, produces the emission of white electroluminescence. Herein, a hybrid-WLED with a sufficiently low turn-on voltage (3.5 V), produced by taking advantages of the large Stokes shift inherent in ncSi, is demonstrated. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA. Source

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