TITLE

Solution-processed small molecule-based blue light-emitting diodes using conjugated polyelectrolytes as electron injection layers

AUTHOR(S)
Walker, Bright; Tamayo, Arnold; Jihua Yang; Brzezinski, Jacek Z.; Nguyen, Thuc-Quyen
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/11/2008, Vol. 93 Issue 6, p063302
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Organic blue light-emitting diodes were studied using the solution processable small molecule 2,7-dipyrenyl-9,9′-dioctyl-fluorene (DPF) as the light-emitting material. The devices were fabricated in two simple structures: indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/DPF/LiF/Al and ITO/PEDOT:PSS/DPF/PFN-BIm4/Al, where PFN-BIm4 is poly[9,9′-bis[6″-(N,N,N-trimethylammonium)hexyl]fluorene-alt-co-phenylene] with tetrakis(imidazolyl)borate counterions. The LiF or PFN-BIm4 act as electron injection layers. The ITO/PEDOT:PSS/DPF/PFN-BIm4/Al device, in which all organic layers are cast from solution, has a turn-on voltage of 3.8 V, a luminance of 2000 cd/m2, and an efficiency of 0.6 cd/A. Using the PFN-BIm4 layer shows a significant improvement of the device performance when compared to the LiF layer.
ACCESSION #
34000041

 

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