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Jicheol Shin, Hyun Ah Um, Min Ju Cho, Tae Wan Lee, Kyung Hwan Kim, Jung-Il Jin, Seogshin Kang, Taehan Park, Sung Hoon Joo, Joong Hwan Yang and Dong Hoon Choi Cascade hole transport in efficient green phosphorescent light-emitting devices achieved by layer-by-layer solution deposition using photocrosslinkable-conjugated polymers containing oxetane side-chain moieties Journal of Polymer Science Part A: Polymer Chemistry 50

Version of Record online: 7 NOV 2011 | DOI: 10.1002/pola.25044

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Two photoreactive polymers were synthesized using 2,7-(or 3,6-)-dibromo-9-(6-((3-methyloxetan-3-yl)methoxy)hexyl)-9H-carbazole) and 2,4-dimethyl-N,N-bis(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)aniline via a Suzuki coupling reaction. Without the use of a conventional hole injection layer of poly(3,4-ethylenedioxythiophene)/(polystyrene sulfonate) (PEDOT:PSS), the resulting green light-emitting device (K-4) bearing PVK: 5-4-tert-butylphenyl-1,3,4-oxadiazole (PBD):Ir(Cz-ppy)3 exhibited a maximum external quantum efficiency of 9.69%; this corresponds to a luminous efficiency of 29.57 cd/A for the device configuration ITO/POx-I/POx-II/PVK:PBD:Ir(Cz-ppy)3/TAZ/Alq3/LiF/Al.

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