Voltammetric Investigation for Electron-Transfer Characteristics of Organic Semiconductors

초록

Two voltammertic techniques, cyclic voltammetry (CV) and chronocoulometry (CC), were employed to investigate the redox characteristics of two organic semiconductors in organic light-emitting diodes (OLED), fac-tris(2-phenylpyridine)iridium (Ir(ppy)(3)) and N, N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (NPB). The electron-transfer characteristics including of oxidation formal potentials (E-o'), diffusion coefficients (D-o), electron-transfer rate constants (k(o)') were estimated by the combination of CV and CC measurements. The energy level of the highest-occupied molecular-orbital (E-HOMO) was also found by quantitative relationship between the oxidation potential and the ionization energy.

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