Improved Thermal Stability of Dye-Based Optical Discs: Effect of Hydrogen Bonding

概要

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To improve the stability of dye-based optical discs during long-term storage, we examined the effect of hydrogen bonding in the dye layer with the expectation that the strong networks of hydrogen bonds would suppress the migration of chemical species, thereby preventing changes in the properties of the amorphous dye films. Intermolecular hydrogen bonding was compared in six dyes, which were composed of a combination of an indodicarbocyanine-dye cation and six colorless naphthalenedisulphonate anions with zero to two hydroxyl groups. Accelerated temperature/humidity testing revealed that the introduction of hydroxyl groups on the colorless anions improved the stability of the cyanine-dye-based optical discs. The error rate was very low, particularly when a thermally stable network of hydrogen bonds involving the hydroxyl (–OH) groups was present, as confirmed by variable-temperature IR spectroscopy. This stabilization due to hydrogen bonding affords a new guideline for designing dyes for optical discs.
2009-04-25