Abstract:

A series of new phosphorescent 2-(phenyl)-benzothiazolate derivatives iridium(Ⅲ) acetylacetonate complexes are synthesized from benzoyl-chloride and substituted benzoyl-chloride, 2-aminothiophenol and iridium trichloride anhydrate via three-step-reaction. All these complexes are characterized by ¹H NMR, FTIR, mass spectrometry and elemental analysis. The solubility, thermogravitometric analysis, UV-Vis absorption, photoluminescence and quantum efficiencies of these complexes are investigated. The results indicate that all these complexes have better solubility in common organic solvents such as dimethyl-sulfoxide and chloroform. The TGA thermograms show that the decomposition temperature of all these complexes are stable up to 338—360 ℃, all the complexes have excellent performance in thermostability, and they can be easily sublimed that makes them suitable for high-vacuum thermal evaporation films. The UV-Vis absorption spectra of these complexes show intense high energy transitions π-π* from 250 to 350 nm, singlet metal to ligand charge-transfer(¹MLCT) from 400 to 450 nm and the triplet metal to ligand charge-transfer(³MLCT) from 450 to 530 nm. A series of strong yellow photoluminescence(in the range of 560 to 600 nm) and high quantum efficiencies of these complexes are also observed at room temperature.

Key words: Iridium(Ⅲ) complex, Organic phosphorescent material, Thermostability