| 摘要 |
A power-saving, highly-reversible optical device is provided. The transmittance through the device is well controlled within a visible ray range. The device has good spectral characteristics while shielded from light, and the electrodes in the device are prevented from being in overpotential condition. The device has a long life, and is protected from being discolored and deteriorated in cycle use. Also, an electrolytic solution to be used in the device is provided.The optical device comprises a solution as so put between working electrodes and a counter electrode that driving control of these electrodes brings about deposition or dissolution of silver. In this, the solution is prepared by dissolving a silver salt in a solvent, to which are added a supporting salt of an alkali metal halide such as LiBr or the like, and an alkanolamine, and optionally coumarin and a mercaptoalkylimidazole.
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