Abstract
The opto-electronic devices, for example light - emitting diodes, photovoltaic cells and optical sensors fabricated from conjugated polymers (CPs) are far less costly than inorganic semiconductor based devices. The efficiency of intrachain and interchain transport of excitation energy determines the performance of CP based opto-electronic devices. At this juncture, it is important to realize the strong correlation between the optical properties of CPs and, the degree of defects and disorder along a CP chain [1]. The single molecule experiments carried on poly[2-methoxy-5-(20-ethylhexyl)oxy-1,4-phenylenevinylene] (MEH-PPV) have explored this correlation and suggested the existence of a photochemical funnel in the photophysics of CPs [2]. The conformational and/or chemical defects along the polymer chain leads to length distribution of chromophores along the chain [3]. Efficient non-radiative energy transfer among these chromophore segments is considered to be the origin of photochemical funnel. To establish the existence of photochemical funnel, we studied excitation energy dynamics along PPV chains [4].
© 2015 Japan Society of Applied Physics, Optical Society of America
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