Indium-tin-oxide-free tris(8-hydroxyquinoline) Al organic light-emitting diodes with 80% enhanced power efficiency

TitleIndium-tin-oxide-free tris(8-hydroxyquinoline) Al organic light-emitting diodes with 80% enhanced power efficiency
Publication TypeJournal Article
Year of Publication2011
AuthorsCai M, Xiao T, Liu R, Chen Y, Shinar R, Shinar J
Journal TitleApplied Physics Letters
Volume99
Pages153303
Date Published10
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000295883800073
Keywordsanodes, films, highly conductive polymer, photovoltaics, solar-cells
Abstract

Efficient indium tin oxide (ITO)-free small molecule organic light-emitting diodes (SMOLEDs) with multilayered highly conductive poly(3,4-ethylenedioxy thiophene):poly(styrenesulfonate) (PEDOT:PSS) as the anode are demonstrated. PEDOT:PSS/MoO(3)/N,N'-diphenyl- N,N'-bis (1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPD)/tris(8-hydroxyquinoline) Al (Alq(3))/4,7-diphenyl-1,10-phenanthroline (BPhen)/LiF/Al SMOLEDs exhibited a peak power efficiency of 3.82 lm/W, 81% higher than that of similar ITO-based SMOLEDs (2.11 lm/W). The improved performance is believed to be due to the higher work function, lower refractive index, and decreased surface roughness of PEDOT:PSS vs ITO, and to Ohmic hole injection from PEDOT:PSS to the NPD layer via the MoO(3) interlayer. The results demonstrate that PEDOT:PSS can substitute TO in SMOLEDs with strongly improved device performance. (C) 2011 American Institute of Physics. [doi :10.1063/1.3634210]

DOI10.1063/1.3634210
Alternate JournalAppl. Phys. Lett.