Issue 25, 2005

A new family of bis-DCM based dopants for red OLEDs

Abstract

We have synthesized a series of novel bis-DCM derivatives as candidate red dopants for use in organic light-emitting devices (OLEDs), by introducing various donor-substituted aryl rings. Compared to DCJTB (621 nm), the novel dopants (637–677 nm) showed more red-shifted emission in 1,2-dichloroethane. Using bis-DCMNEtOBu (7) as a dopant, we fabricated OLEDs with the configuration of ITO/4,4′,4″-tris(3-methylphenylamino)triphenylamine (m-MTDATA) (20 nm)/N,N′-bis(1-naphthyl)-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) (40 nm)/tris(8-quinolinolato)aluminium (Alq3) : red dopant (35 nm, x wt%)/Alq3 (35 nm) LiF/Al. The device with a doping concentration of 1.25 wt% showed pure red emission at λmax = 654 nm (chromaticity coordinate: x = 0.67, y = 0.33) and a maximum brightness of 2500 cd m−2. The chromaticity coordinates were almost independent of current density. Moreover, highly efficient red emission (x = 0.63, y = 0.36) was obtained in the 0.74 wt% doped device. The maximum external quantum efficiency was 4.46% at 7 V, the current efficiency was 3.43 cd A−1, and the power efficiency was 1.64 lm W−1. The highest brightness of 8300 cd m−2 was obtained at 19.6 V.

Graphical abstract: A new family of bis-DCM based dopants for red OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
04 Jan 2005
Accepted
30 Mar 2005
First published
12 May 2005

J. Mater. Chem., 2005,15, 2470-2475

A new family of bis-DCM based dopants for red OLEDs

B. Jung, J. Lee, H. Y. Chu, L. Do, J. Lee and H. Shim, J. Mater. Chem., 2005, 15, 2470 DOI: 10.1039/B419408J

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