• 作者： 楊吉水，顏巨倫
• 作者服務機構： Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, R.O.C.
• 中文摘要： The synthesis, electronic spectra, and thermal and electrochemical properties of two triptycene-capped trans-4,4￠-diaminostilbenes (1Me and 1Ph) are reported in order to evaluate their applicability as blue light-emitting materials in organic light-emitting diodes (OLEDs). For comparison, the fluorescence properties of the planar analogs 2Me and 2Ph are also investigated. High fluorescence quantum yields (0.72-0.78) are observed for 1Me and 1Ph in THF, presumably due to a large barrier for the nonradiative double-bond torsion reaction in the singlet excited state. In the spin-cast thin films, the fluorescence quantum efficiencies become lower (0.15-0.26) and the fluorescence spectra are red-shifted. Compared to 1Me and 1Ph, 2Me and 2Ph display even larger fluorescence shifts and fluorescence quenching, which can be attributed to their more planar structures that favor intermolecular p-stacking in the solid state. The glass transition temperatures for 1Me and 1Ph are 113 and 120 ℃, respectively, and the decomposition temperatures 341 and 375 ℃, respectively. Cyclic voltammograms of 1Me and 1Ph show two reversible redox waves, corresponding to two monoelectronic oxidation processes of the amino groups forming radical cation and dication species.
• 英文摘要： --
• 中文關鍵字： Triptyene; Diaminostilbene; OLED; Cyclic voltammogram.
• 英文關鍵字： --