CHIRALITY OF POLYMERS IN EXCITED STATES

Description Fluorescent and phosphorescent organic polymers are an important class of materials for organic light-emitting diodes (OLEDs) based on their advantages that emission properties can be modified through molecular designs, that they are inherently light and flexible, and that they can be readily fabricated by solution processes. Among various polymers of this class, those emitting circularly polarized light (CPL) are of particular interest because of their potential for photonic devices such as 3D displays and energy-efficient backlights for LC displays. We have synthesized two types of CPL-emitting chiral polymers, i.e., a hyperbranched fluorenevinylene polymer (1) and poly[2,7-bis(4-tbutylphenyl)dibenzofulvene] (2). 1 and 2 emits green CPL and white CPL, respectively. It should be noted that 1 emits CPL at a high efficiency (anisotropy) in an amorphous film without any detectable inter-chain alignment. 1 may take a highly anisotropic structure in excited states that largely differs from the chiral structure in the ground state.
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