A saturated red color converter for visible light communication using a blend of star-shaped organic semiconductors

Muhammad Tariq Sajjad, Pavlos Manousiadis, Clara Orofino, Alexander Kanibolotsky, Neil Findlay, Sujan Rajbhandari, Chiranthika Dimali Amarasinghe Vithanage, Hyunchun Chun, Graham Faulkner, Dominic O'Brien, Peter Skabara, Graham Alexander Turnbull, Ifor David William Samuel

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Abstract

We report a study of blends of semiconducting polymers as saturated red color converters to replace commercial phosphors in hybrid LEDs for visible light communication (VLC). By blending two star-shaped organic semiconductor molecules, we found a near complete energy transfer (> 90% efficiency) from the green-emitting truxene-cored compound T4BT-B to the red-emitting boron dipyrromethene (BODIPY) cored materials. Furthermore, we have demonstrated the capability of these materials as fast color converters for VLC by measuring their intrinsic optical modulation bandwidth and data rate. The measured 3 dB modulation bandwidth of blends (~55 MHz) is more than 10 times higher than commercially available LED phosphors and also higher than the red-emitting BODIPY color converter alone in solution. The data rate achieved with this blend is 20 times higher than measured with a commercially available phosphor based color converter.
Original languageEnglish
Article number013302
Number of pages4
JournalApplied Physics Letters
Volume110
Issue number1
Early online date6 Jan 2017
DOIs
Publication statusPublished - Jan 2017

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