Thiazolo[5,4- d ]thiazoles with a spirobifluorene moiety as novel D–π–A type organic hosts: design, synthesis, structure–property relationship and applications in electroluminescent devices

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Novel D–π–A type organic small-molecules with thiazolo[5,4- d ]thiazole and spirobifluorene units. Optoelectronical properties suggests their applications in materials. Electroluminescent devices containing the novel TzTz-based derivatives 4b, 5b show affinitive emission.