Electroluminesent properties of phenothiazyl derivatives having aromatic moieties

Abstract This paper reports the synthesis and electroluminescent properties of new aromatic compounds as hole‐transporting materials based on phenothiazine, such as 1,4‐diphenothiazyl‐benzene [DPtzB], 1,4‐diphenothiazyl‐xylene [DPtzX] and 9,10‐diphenothiazyl‐anthracene [DPtzA]. DPtzB thin film exhibited photoluminescence (PL) maximum emission peak and emission shoulder at 450 and 475 nm, and a maximum emission at 447 nm without emission shoulder was obtained in DPtzX thin film. When DPtzA was excited by incident light of 359 nm, DPtzA showed strong PL emission at 417 nm and weak emission at 600 nm. Luminance efficiency of DPtzB, DPtzX and DPtzA‐based electroluminescence (EL) devices was 3.57, 3.46 and 0.47 cd/A, and power efficiency of DPtzB, DPtzX and DPtzA‐based EL devices was 1.48, 1.26 and 0.20l m/W.