Photoluminescent compounds are described having no-ligand. These have formula (I) in which Ln represents a lanthanide ion, each of X, Y, and Z, which may be the same or different, represents hydrogne, an optionally substituted aromatic group or an optionally substituted aliphatic or cycloaliphatic group, such that at least one of X, Y and Z represents a said aromatic group which is conjugated with the pyrazolone ring system and such that when X or Y represents a said group, said group can optionally be attached via a hetero atom. These compounds possess useful electroluminescent properties such that they can be used in electroluminescent devices.
本文描述了无
配体的荧光化合物,其
化学式为(I),其中Ln代表
镧系离子,X、Y和Z分别表示
氢原子、可选取代的芳香基团或可选取代的
脂肪族或环状
脂肪族基团,其中至少一个X、Y或Z代表与
吡唑酮环系统共轭的芳香基团,且当X或Y代表该基团时,该基团可通过杂原子连接。这些化合物具有有用的电致发光特性,因此可以用于电致发光器件中。