Issue 26, 2016

A pyridine based meta-linking deep-blue emitter with high conjugation extent and electroluminescence efficiencies

Abstract

We designed and synthesized a bipolar deep-blue emitter 2,6-bis(4-(1-(4-(tert-butyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)pyridine (26BTPIPy) based on a meta-linking D–π–A–π–D structure. Compared to its para-linking analogue (25BTPIPy), the meta-linking in 26BTPIPy effectively shortens molecular conjugated length and restricts intramolecular charge transfer. Interestingly, unlike most other meta-linking emitters, a high fluorescence yield can be maintained in 26BTPIPy. This may be attributed to a relatively planar structure at the benzene–pyridine–benzene joint in 26BTPIPy leading to considerable overlapping of its frontier molecular orbitals. These suitable combinations of properties endow 26BTPIPy with efficient deep-blue emission and good bipolar carrier transporting characteristics. An organic light-emitting device using 26BTPIPy as an emitter shows a low turn-on voltage (2.8 V), deep-blue emission with a color index of (0.15, 0.09) and high current and external quantum efficiencies (4.16 cd A−1 and 5.15%). Besides, a bilayer device using 26BTPIPy as both an emitting and electron-transporting material also gives high performance with a current efficiency of 4.22 cd A−1 and a color purity of (0.15, 0.11).

Graphical abstract: A pyridine based meta-linking deep-blue emitter with high conjugation extent and electroluminescence efficiencies

Supplementary files

Article information

Article type
Paper
Submitted
26 Apr 2016
Accepted
30 May 2016
First published
01 Jun 2016

J. Mater. Chem. C, 2016,4, 6249-6255

A pyridine based meta-linking deep-blue emitter with high conjugation extent and electroluminescence efficiencies

Z. Zhu, W. Chen, L. Zhang, X. Liu, Q. Tong, F. Wong, F. Lu and C. Lee, J. Mater. Chem. C, 2016, 4, 6249 DOI: 10.1039/C6TC01689H

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