Cyclovoltametric Methods for the Ionization Potential and Electron Affinity of Iridium ppy Derivatives

• 영문명: Cyclovoltametric Methods for the Ionization Potential and Electron Affinity of Iridium ppy Derivatives
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: Shin DongMyung Sohn ByoungChung
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제20권 제2호, 125~129쪽, 전체 5쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2003.06.30

영문 초록

The effects of molecular structure on the redox properties of the organic electroluminescent materials (Ir(ppy)3 Ir(m-ppy)3 Ir(p-toly)3) were studied using cyclic voltammetry and spectroscopy. These iridium complexes show reversible oxidation and reduction on the electrode, which produce the symmetric cyclic voltammogram. It indicates that these materials are very stable under repetitive oxidation/reduction cycles. The electrochemically determined ionization potentia/electron affinity values are 5.4OeV/3.02eV for Ir(ppy)3, 5.36eV/2.96eV for Ir(m-ppy)3, and 5.35eV/2.97eV for Ir(p-toly)3 from the SCE(Standard Calomel Electrode). The electrically determined band gaps are 2.38eV (521nm), Ir(ppy)3, 2.4OeV (517nm), Ir(m-ppy)3, and 2.38eV (521nm). Ir(p-toly)3, which are similar with the optical band gaps. The position of methyl group on 2-phenylpyridine (ppy) effects do not influence much on the ionization potential, electron affinity, and band gap of Ir(ppy)3 derivatives.

키워드

clic voltammetry ITO AI IP EA Electroluminescence Ir(ppy)3 Ir(m-ppy)3Ir(m-toly)3