Naphthyridine-based emitters simultaneously exhibiting thermally activated delayed fluorescence and aggregation-induced emission for highly efficient non-doped fluorescent OLEDs. Issue 22 (5th April 2019)

• Record Type: Journal Article
• Authors: Zhou, Xue; Yang, Hannan; Chen, Zhanxiang; Gong, Shaolong; Lu, Zheng-Hong; Yang, Chuluo
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 22(2019)
• Page Start: 6607
• Page End: 6615
• Publication Date: 2019-04-05
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc00346k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Two naphthyridine-based emitters are demonstrated to be TADF and AIE emitters to afford superior EL efficiencies in non-doped OLEDs. Abstract : Luminescent materials simultaneously exhibiting superior luminescence efficiency, thermally activated delayed fluorescence (TADF) and aggregation-induced emission (AIE) properties in the solid state are eagerly required for highly efficient non-doped organic light-emitting diodes (OLEDs). Herein, two new emitters, namelyND-AC andCND-AC, featuring a naphthyridine or cyano-naphthyridine segment as the electron acceptor and an acridine unit as the electron donor were designed, synthesized and investigated. The nearly orthogonal molecular configuration of the target emitters not only endows them with small energy differences between singlet and triplet states for ensuring TADF character but also affords a remarkable AIE feature. Due to the high photoluminescence quantum yields, and excellent TADF and AIE characteristics, the doped and non-doped OLEDs based onND-AC exhibit outstanding performances with maximum external quantum efficiencies of 16.8% and 12.0%, respectively. These results demonstrate that the naphthyridine-based emitters have a promising application in OLEDs.