TY - JOUR
T1 - Solution-processed small molecule-based blue light-emitting diodes using conjugated polyelectrolytes as electron injection layers
AU - Walker, Bright
AU - Tamayo, Arnold
AU - Yang, Jihua
AU - Brzezinski, Jacek Z.
AU - Nguyen, Thuc Quyen
N1 - Funding Information:
This work was supported by the NSF CAREER Grant No. DMR 0547639 and the Office of Naval Research Young Investigator Program.
PY - 2008
Y1 - 2008
N2 - 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-BIm 4, 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.
AB - 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-BIm 4, 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.
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U2 - 10.1063/1.2968189
DO - 10.1063/1.2968189
M3 - Article
AN - SCOPUS:49749125079
SN - 0003-6951
VL - 93
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 6
M1 - 063302
ER -