In this paper a novel type of electrochemiluminescence (ECL) cell is described. The cells are thin‐layer compartments with transparent electrodes spaced by 10–100 μm. The filling of the cells consists of electrolyte‐free solutions of well‐known luminescors such as rubrene in solvents of low polarity, as for example 1.2‐dimethoxyethane. The cells can be operated on d‐c voltages, but the luminescence is observed at the anode only. The luminescence efficiency is about 1% (photons per electrons) and the lifetimes of the cells were found to be much longer than those of conventional electrolytic cells. Certain characteristics of the novel systems, such as the current‐voltage behavior, geometrical structures of the luminescence, and the transport mechanisms (diffusion, drift, and electrohydrodynamic convection) are discussed in some detail.
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Schaper et al. (1982) studied this question.