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Synthesis and Characterization of Non-Conjugated Polymers with Hole-Conductor and Red-Emitter in Side-Chain  

Shim, Na-Young (Department of Chemistry, Sogang University)
Lee, Hoo-Sung (Department of Chemistry, Sogang University)
Publication Information
Polymer(Korea) / v.29, no.5, 2005 , pp. 486-492 More about this Journal
Abstract
Into a no-conjugated polymer chain we have introduced side chains with a styrene-linked triphenylamine segment as a $\pi-electron$ donor, styrene-]inked aminobenzaldehyde segment as a tunable reactive -CHO group, and PM (4-(dicyanomethylene)-2-(tert-butyl)-4H-pyran) moiety as a $\pi-electron$ acceptor for red emitting materials. The thermal stability and the optical properties of the statistical copolymers have been studied. All the polymers were electrochemically active and showed electroluminescent emission at around 700nm. The EL device of P5-PM based on the sturcture of $ITO/PPV/polymer/BCP/Alq_3/Al$ showed a maximum brightness of $120cd/m^2\;at\;50mA/cm^2$ with an external quantum efficiency of $0.67\%$. It was possible to enhance the external quantum efficiency by balancing the charge recombination. A red-emitting polymer with high external quantum efficiency was developed by incorporating bifunctionality.
Keywords
polymer light emitting diode; non-conjugated polymer; red emitter; hole conductor.;
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