Abstract
Main observation and conclusionThree new deep blue light emitters, bearing quinoxaline with different substituents (biphenyl/pyrene) at the 1‐ or 2‐position, were synthesized by a Pd‐catalysed coupling reaction in high yields, and were fully characterized by 1H/13C NMR spectroscopy, single crystal X‐ray diffraction, and high‐resolution mass spectrometry (HRMS). The designed molecules exhibit good thermal stability (Tg > 452 oC). Single crystal X‐ray diffraction indicated the compounds containing pyrene units exhibiting π‐π stacking, and thus this family of compounds exhibited intramolecular charge transfer (ICT) and non‐typical and aggregation‐induced enhanced emission (AIEE) characteristics, possessing blue emission both in solution and in the aggregation (solid) state. Furthermore, a selected deep blue emitter was utilized as the emitting layer for the fabrication of doped organic light‐emitting diode (OLED) devices, which afforded a deep blue electroluminescence (EL) peak at 428 nm with a narrow full width at half maximum (FWHM) of 57 nm, and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.15, 0.06).
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