The synthesis, crystal structures, aggregation-induced emission and electroluminescence properties of two novel green-yellow emitters based on carbazole-substituted diphenylethene and dimesitylboron

• Published in: Organic electronics Vol. 33; pp. 78 - 87
• Main Authors: Shi, Heping, Xin, Dehua, Bai, Sheng-Di, Fang, Li, Duan, Xin-E, Roose, Jesse, Peng, Huiren, Chen, Shuming, Tang, Ben Zhong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2016
• Subjects: Aggregation-induced emission; Carbazole; Dimesitylboron; Diphenylethene; Electroluminescence; Diphenylethene; Electroluminescence; Dimesitylboron; Aggregation-induced emission; Carbazole
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2016.03.003

Introducing the hole-transporting carbazole moiety into an aggregation-induced emissive tetraarylethene skeleton and attaching electron-transporting dimesitylboron groups to the periphery, we obtain two novel electroluminescent materials. Their structures are fully characterized by elemental analysis, mass spectrometry, NMR spectroscopy and X-ray crystallography. Furthermore, their thermal, electrochemical, as well as photophysical properties including AIE-behavior are systematically investigated not only by experimental methods but also by DFT computation. Thereby, we show that the two compounds possess high thermal and electrochemical stability with a remarkable AIE-behavior. X-ray crystal analyses aided by DFT calculations provide insights in the origin of the luminescent properties and AIE features. Ultimately, two non-doped OLEDs (Device A and Device B) were fabricated by using PDPBCE and BDPBCE as light-emitting layer, respectively. Device A showed yellowish-green light with a turn-on voltage of 3.8 V, a maximum brightness of 59130 cd m−2 and a maximum current efficiency of 6.43 cd A−1. Device B exhibited greenish-yellow light with a turn-on voltage of 3.0 V, a maximum brightness of 67,500 cd m−2 and a maximum current efficiency of 11.2 cd A−1. [Display omitted] •Two compounds based on diphenylethene framework were synthesized and characterized by single crystal X-ray diffraction.•They exhibit aggregation-induced emission (AIE) properties.•Efficient multi-layer non-doped electroluminescent devices fabricated with them show good electroluminescent performances.