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The Control of Conjugation Lengths and Steric Hindrance to Modulate Aggregation‐Induced Emission with High Electroluminescence Properties and Interesting Optical Properties
Author(s) -
Xue MiaoMiao,
Xie YueMin,
Cui LinSong,
Liu XiangYang,
Yuan XiaoDong,
Li YongXi,
Jiang ZuoQuan,
Liao LiangSheng
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201503041
Subject(s) - electroluminescence , steric effects , molecule , fluorescence , chemistry , photochemistry , aggregation induced emission , materials science , stereochemistry , nanotechnology , organic chemistry , optics , physics , layer (electronics)
A series of novel AIE‐active (aggregation‐induced emission) molecules, named SAF‐2‐TriPE, SAF‐3‐TriPE, and SAF‐4‐TriPE, were designed and synthesized through facile reaction procedures. We found that incorporation of the spiro‐acridine‐fluorene (SAF) group, which is famous for its excellent hole‐transporting ability and rigid structure, at different substitution positions on the phenyl ring affected the conjugation lengths of these compounds. Consequently, we have obtained molecules with different emission colors and properties without sacrificing good EL (electroluminescence) characteristics. Accordingly, a device that was based on compound SAF‐2‐TriPE displayed superior EL characteristics: it emitted green light with η c, max =10.5 cd A −1 and η ext, max =4.22 %, whereas a device that was based on compound SAF‐3‐TriPE emitted blue‐green light with η c, max =3.9 cd A −1 and η ext, max = 1.71 %. These compounds also displayed different AIE performances: when the fraction of water in the THF solutions of these compounds was increased, we observed a significant improvement in the Φ F of compounds SAF‐2‐TriPE and SAF‐3‐TriPE; in contrast, compound SAF‐4‐TriPE showed an abnormal phenomenon, in that it emitted a strong fluorescence in both pure THF solution and in the aggregated state without a significant change in Φ F . Overall, this systematic study confirmed a relationship between the regioisomerism of the luminophore structure and its AIE activity and the resulting electroluminescent performance in non‐doped devices.