PEDOT:PSS:sulfonium salt composite hole injection layers for efficient organic light emitting diodes
作者： Apostolis Verykios , Giorgos Pistolis , Lambros Bizas , Charalambos Tselios , Dimitris Tsikritzis
DOI: 10.1016/J.ORGEL.2021.106155
关键词: Work function 、 PEDOT:PSS 、 Copolymer 、 Acceptor 、 OLED 、 Chemical engineering 、 Exciton 、 Trifluoromethanesulfonate 、 Sulfonate 、 Materials science
摘要: Abstract In this work, we propose a simple and effective approach to modify the optoelectronic properties of commonly used poly(3,4-ethylenedioxylthiophene):poly(styrene sulfonate) (PEDOT:PSS) consequently improve hole injection transport in organic light emitting diodes (OLEDs) using emissive layers based on fluorescence copolymer. particular, two triphenylsulfonium (TPS) salts that consist same TPS cation different counter anions, hexafluoroantimonate (SbF6) trifluoromethane sulfonate (Triflate) were added PEDOT:PSS solution various concentrations composite films fully characterized for surface subsequently employed as (HILs) OLEDs. It is demonstrated both, anion concentration TPS-salts matrix play significant role thus device performance. Although all TPS-salt modified exhibited higher work function (WF) values relative undoped one resulting more efficient than pristine PEDOT:PSS, PEDOT:PSS:TPS-Triflate with lower (10:1 v/v) showed highest luminous (LE) power efficiency (PE) 27.04 cd A−1 6.26 lm W−1, respectively. This extraordinary performance was ascribed increase conductivity film combined formation an interface exciplex between TPS-Triflate (acceptor) copolymer (donor). interfacial electroplex strongly confines generated excitons prevents their diffusion towards aluminum cathode which acts exciton quencher.
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