Abstract
AbstractHighly oriented light‐emitting blend films containing poly(9,9‐dioctylfluorene) (PFO), PFO with one fluorenone unit (PFF), and ultrahigh‐molecular‐weight polyethylene (U‐PE) are prepared by using a tensile deformation technique. A high dichroic ratio of 36 in photoluminescence from the oriented film is obtained. The photophysical properties of the PFF/PFO blend are investigated in the blend films. In particular, the origin of the green band (‘g‐band’) that often undesirably appears from PFO used in air, is discussed in such a highly oriented circumstance. The experimental results powerfully demonstrate that the g‐band originates from the mono‐chain fluorenone moieties, rather than the fluorenone‐based excimer.magnified image
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