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Indexed by:期刊论文

Date of Publication:2017-04-19

Journal:TETRAHEDRON LETTERS

Included Journals:SCIE、Scopus

Volume:58

Issue:16

Page Number:1579-1584

ISSN No.:0040-4039

Key Words:TADF; Donor-acceptor structure; meta-Position connection; OLED

Abstract:A novel compound was designed and synthesized by connecting a dicyanobenzene acceptor and two 9,9-dimethyl-9,10-dihydroacridine donors to the 1,3,5-position of a phenyl ring by meta-position connection. This compound, which is a novel emitter for OLED devices, exhibits preferable heat stability. Moreover, the energy gap between its singlet and triplet states is as small as 0.04 eV, resulting in this molecule possesses thermally activated delayed fluorescence. Therefore, the corresponding device showed efficient electroluminescent performances. The maximum external quantum efficiency, maximum current efficiency, maximum power efficiency and maximum luminance were 16.5%, 40.8 cd A(-1), 45.81m W-1 and 5120 cd m(-2), respectively. In addition, the CIEx,y only changed from (0.22, 038) to (0.22, 0.39) over the entire operating voltage range, which confirms that the device possesses highly stable chromaticity with respect to the current density. Based on these experimental results, meta-connected type structures may provide a new approach for developing high-performance TADF emitters for OLED applications. (C) 2017 Elsevier Ltd. All rights reserved.