Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
White light emitting materials at the nanoscale represent a research field of both fundamental interest as well as industrial relevance for lighting and display technologies and for biomedical imaging. Indeed, white organic emitters are currently investigated for their potential in new concept flexible light-weight plastic lighting sources and as promising light emitting components for optoelectronic devices. As a rule, white light can be obtained from combination of single emitters of the three fundamental colors (red, green, blue) or of two complementary colors (i.e. orange and blue), properly organized to control the energy transfer phenomena among the fluorophores. A promising route to obtain single white luminescent nanostructures can be the combination of organic and inorganic chromophores. In this perspective, silica nanobeads can represent a useful platform to host and assemble both light emitting molecules and QDs, resulting in new luminescent nanostructures with multiple color emission under single excitation for application in sensors, bio-labeling and emitting displays.
Here we propose the synthesis of single hybrid colloidal core-shell nanostructures, emitting in the white region, based on silica coated CdSe@ZnS QDs functionalized with oligofluorene molecules.
Such nanostructures are conveniently obtained via a synthetic strategy which enables a fine tuning of each distinct structural factor governing light emission properties. Namely, white light is achieved by a careful control of different parameters as i) the size dependent emission wavelength of CdSe@ZnS QDs, tuned to complement the blue emission of oligofluorene, ii) the amount of the QDs embedded into and iii) the relative amount of fluorene anchored onto the silica beads.
Therefore, engineering the size and chemistry of the quantum dots, the suitable molecular design of the organic dye and, finally, the possibility of tuning their relative amount represent the key advantages of the proposed strategy. This approach can be easily extended to the fabrication of an endless number of single hybrids luminescent nanostructures
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