Issue 6, 2015

Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

Abstract

Two strongly luminescent complexes, [Cu(czpzpy)(PPh3)]BF4 (1) and [Cu(czpzpy)(POP)]BF4 (2), bearing a new carbazole-based diimine ligand (czpzpy = 2-(9H-carbazolyl)-6-(1H-pyrazolyl)pyridine, PPh3 = triphenylphosphine, and POP = bis[2-(diphenylphosphine)phenyl]ether) were synthesized and characterized. Complex 2 emits intense thermally activated delayed fluorescence (TADF) with high photoluminescence quantum yields (PLQYs) of up to 0.98 at room temperature in the solid state. A highly efficient solution-processed OLED, with an emissive layer was spin-coated using a mixture of the diimine ligand czpzpy and the starting material, [Cu(CH3CN)2)(POP)]BF4, was fabricated with peak efficiencies of 6.36% (external quantum efficiency, EQE) and 17.53 cd A−1 (current efficiency, CE) and a maximum brightness of 3251 cd m−2. These performances are nearly identical to those of the device whose emissive layer was comprised of complex 2 and czpzpy, indicating that this simplified process, which omits the preparation and purification of the emissive complex, is practicable in preparing efficient solution-processed OLEDs. In this approach, czpzpy, which bears a carbazole unit, was used both as a ligand to form the emissive cuprous complex and as a host matrix for the formed emitter.

Graphical abstract: Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
08 Oct 2014
Accepted
26 Nov 2014
First published
28 Nov 2014

J. Mater. Chem. C, 2015,3, 1187-1195

Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

X. Chen, C. Lin, X. Wu, R. Yu, T. Teng, Q. Zhang, Q. Zhang, W. Yang and C. Lu, J. Mater. Chem. C, 2015, 3, 1187 DOI: 10.1039/C4TC02255F

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