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Novel fast color-converter for visible light communication using a blend of conjugated polymers

Sajjad, Muhammad T. and Manousiadis, Pavlos P. and Chun, Hyunchae and Vithanage, Dimali A. and Rajbhandari, Sujan and Kanibolotsky, Alexander L. and Faulkner, Grahame and O'Brien, Dominic and Skabara, Peter J. and Samuel, Ifor D.W. and Turnbull, Graham A. (2015) Novel fast color-converter for visible light communication using a blend of conjugated polymers. ACS Photonics, 2 (2). pp. 194-199. ISSN 2330-4022

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Abstract

Visible Light Communications (VLC) is a promising new technology which could offer higher data transmission rates than existing broadband RF/microwave wireless technologies. In this paper, we show that a blend of semiconducting polymers can be used to make a broadband, balanced color converter with a very high modulation bandwidth to replace commercial phosphors in hybrid LEDs for visible light communications. The resulting color converter exploits partial Förster energy transfer in a blend of the highly fluorescent green emitter BBEHP-PPV and orange-red emitting MEH-PPV. We quantify the efficiency of the photoinduced energy transfer from BBEHP-PPV to MEH-PPV, and demonstrate modulation bandwidths (electrical-electrical) of ∼200 MHz, which are 40 times higher than commercially available phosphor LEDs. Furthermore, the VLC data rate achieved with this blend using On-Off Keying (OOK) is many times (∼35) higher than that measured with a commercially available phosphor color converter.