Abstract
Relationships between molecular structures of three types of europium complexes and solubility in hexane and fluorinated media were investigated. The solubility of europium complexes with β-diketones (type-1) was correlated to the substituents of β-diketones. Introducing bulky substituents was effective for enhancing solubility. On the other hand, europium complexes with β-diketones and phenanthroline (type-2) were scarcely soluble in either solvent. Among europium complexes with β-diketones and phosphine oxides (type-3), complex 16 which has bulky substituents at β-diketones and two different phosphine oxides, was found to be highly soluble even in a fluorinated medium. Thermal properties of europium complexes were correlated to the molecular structures and solubility. ΔHf of 16 is characteristically small compared with similar type-3 complexes. The transparent fluorescent solid in which complex 16 was dissolved plays an important role as a fluorescent layer of light-emitting diodes (LEDs) for realizing large luminous flux (over 870 mlm when 20 mA of direct current was applied to the ultraviolet (maximum wavelength: 402 nm) LED chip).
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