Spectroelectrochemical studies have been perfomed on anodic oxidation of copper in 0.10MKOH using a near normal incidence reflectance spectroelectrochemical (NNMRS) technique, and the results are reported. The results indicate that the anodic oxidation product film formed on the electrode surface can be identified and that their chemical transformations can be followed by recording spectra in situ. It is shown by this technique that hydroxides of Cu(I) and Cu(II) are first formed by anodic oxidation at corresponding potentials, and they transform to oxides upon aging.

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A new polymer of polyester derivative (PE) blend with poly(N-vinycarbazole) (PVK) and compound of PBD at various weight ratio were used as emitter in unilayer electroluminescence (EL) devices with indium cathode. Analyses of fluorescence and EL spectra imply common emission energy states are formed in the blend films, by which to explain the possibility of maximum EL efficiency in blend films higher than that in either of PE and PVK. The PL and EL spectra show the maximum emission band shifts red slightly between 430 nm and 450 nm as increasing the ratio of PE, meanwhile the half width increases and a new peak around 525 nm appears. The new peak is confirmed originating from the dimer formed by coupling of interchains in polymer PE. Both of PE and PVK can give rise to PL emission under UV light. The origin of PL and EL emission is analysed.

019ChemInform Abstract (0.1 M KOH). -It is demonstrated that the anodic oxidation product film can be identified and that the chemical transformations of the initially formed products can be followed by recording the absorption spectra in situ with the near normal incidence reflectance spectroelectrochemical (NNIRS) technique (time required for recording a spectrum 3 min). The results indicate that hydroxides of Cu(I) and Cu(II) are first formed by anodic oxidation at corresponding potentials and transform to oxides upon aging.