On the design of new europium heteroaromatic carboxylates for OLED application

• Published in: Dyes and pigments Vol. 170; p. 107604
• Main Authors: Koshelev, Daniil S., Chikineva, Tatyana Yu, Kozhevnikova (Khudoleeva), Vladislava Yu, Medvedko, Alexey V., Vashchenko, Andrey A., Goloveshkin, Alexander S., Tsymbarenko, Dmitry M., Averin, Alexey A., Meschkov, Anna, Schepers, Ute, Vatsadze, Sergey Z., Utochnikova, Valentina V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2019
• Subjects: Benzothiazole; Benzoxazole; Carboxylates; Lanthanides; Luminescence; OLED; OLED; Lanthanides; Benzothiazole; Carboxylates; Luminescence; Benzoxazole
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2019.107604

The approach to the directed synthesis of lanthanide aromatic carboxylates – precursors to the electroluminescent materials, - was proposed, namely the conjugation length increase and heteroatom introduction in the appropriate position in combination with the neutral ligand introduction. This resulted in the isolation of a series of new lanthanide complexes, among which the highest electroluminescence efficiency was obtained for mixed-ligand europium benzothiazole-2-carboxylate with bathophenanthroline in a solution-processed OLED. The peculiarities of energy transfer processes allowed obtaining luminescence thermometer materials based on this system, which demontrated the sensitivity of 2.8%/K in the physiological range. [Display omitted] •New benzoxazolates and benzothiazolates of some lanthanides were obtained.•Complex properties are mainly independent on the second (O or S) heteroatom nature.•Mixed-ligand europium benzothiazolate with batophenanthroline was successfully used in solution-based OLED.•Bimetallic terbium-europium benzothiazolate demonstrates temperature-dependent luminescence with high sensitivity (2.8%/K).