Abstract
Dy(NO3)3 was dissolved in water–ethanol complex solvent, and the obtained solution was used to fabricate composite films wherein Dy compound particles were embedded in a transparent urethane resin. All the resulting composite films exhibited photoluminescence properties attributed to the Dy-based compounds. When the composite films were prepared by varying the water/ethanol ratio of the raw material solution, the PL intensity was stronger when the water content of the composites was higher. Further ultraviolet irradiation of the resulting films caused the disappearance of the Dy–OH bonds and decrease in the PL intensity of the films. The increase in the PL intensity with increasing water content was attributed to the presence of Dy–OH bonds in the films. In addition, we investigated the presence and PL properties of Dy–OH bonds in Dy-based particle composite films.
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