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A novel photochromic system of europium with nicotinic acid (HL) and 1,10-phenanthroline (phen) was studied. The color of the system turns from yellow to green with a broad absorption band appearing in the range 550–830 nm under the irradiation by a mercury lamp. The pH value of the system plays an important role in the photochromic behavior. It is observed that a higher pH value is favorable to photochromism...
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