NDLI: Star-shaped fluorene–BODIPY oligomers: versatile donor–acceptor systems for luminescent solar concentrators

Content Provider	Royal Society of Chemistry (RSC)
Author	Greenham, Neil C. MacQueen, Rowan W. Cortizo-Lacalle, Diego Skabara, Peter J. Jones, Saul T. E. Davis, Nathaniel J. L. K. Orofino-Pena, Clara Taylor, Rupert G. D. Credgington, Dan
Copyright Year	2017
Abstract	Luminescent solar concentrators (LSCs) are waveguides doped with luminescent centers that can spectrally and spatially concentrate sunlight. They can reduce the cost of photovoltaic energy production and are attractive prospects for photobioreactors and building-integrated applications. Reabsorption, caused by non-zero overlap between the absorption and emission spectra of the light-emitting centers, often limits LSC efficiency. Donor–acceptor energy-transfer complexes are one method to mitigate reabsorption by shifting the emission away from the main absorption peak. Here we introduce versatile star-shaped donor–acceptor molecules based on a central BODIPY energy acceptor with oligofluorene donor side units. Varying the oligofluorene chain length alters the relative oscillator strengths of the donor and acceptor, changing the severity of reabsorption for a given donor density, but also changing the luminescence yield and emission spectrum. We performed comprehensive device measurements and Monte Carlo ray tracing simulations of LSCs containing three oligofluorene–BODIPY donor–acceptor systems with different oligofluorene chain lengths, and then extended the simulation to study hypothetical analogs with higher donor–acceptor ratios and different terminal acceptors. We found that the measured structures permit waveguide propagation lengths on a par with state-of-the-art nanocrystalline emitters, while the proposed structures are viable candidates for photobioreactor and energy production roles and should be synthesized.
Starting Page	1952
Ending Page	1962
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	5
Issue Number	8
Journal	Journal of Materials Chemistry C
DOI	10.1039/c6tc05298c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	LSC Monte Carlo Luminescent solar concentrator Solar cell Reabsorption BODIPY Luminescence Emission spectrum Monte Carlo method Ray tracing Waveguide Photobioreactor
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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