Indolo[3,2,1-jk]carbazole-derived planar electron transport materials realizing high efficiency in green phosphorescent organic light-emitting diodes  

作　　者：Sejeong Um Unhyeok Jo Jun Yeob Lee 

机构地区：[1]School of Chemical Engineering,Sungkyunkwan University 2066,Seobu-ro,Jangan-gu,Suwon,Gyeonggi,16419,Republic of Korea [2]SKKU Advanced Institute of Nano Technology,Sungkyunkwan University 2066,Seobu-ro,Jangan-gu,Suwon,Gyeonggi,16419,Republic of Korea [3]SKKU Institute of Energy Science and Technology,Sungkyunkwan University 2066,Seobu-ro,Jangan-gu,Suwon,Gyeonggi,16419,Republic of Korea

出　　处：《Science China Materials》2023年第11期4437-4444,共8页中国科学（材料科学（英文版）

基　　金：supported by Ministry of Trade,Industry and Energy(MOTIE)(20012622,P0017363)。

摘　　要：Two novel electron transporting materials(ETMs),2-(4,6-diphenyl-1,3,5-triazin-2-yl)indolo[3,2,1-jk]-carbazole(DPTrz-ICz)and 5,11-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-2-phenylindolo[3,2,1-jk]carbazole(2DPTrz-ICz),were developed based on the indolo[3,2,1-jk]carbazole(ICz)core,combined with 2,4-diphenyl-1,3,5-triazine(DPTrz).The introduced ICz core in ETM exhibited enhanced intermolecular charge transport properties owing to its planar and rigid geometry and high triplet energy,demonstrating the potential of designing ETM.Consequently,2DPTrz-ICz,featuring high triplet energy of 2.84 eV,effectively prevented triplet exciton quenching and showed increased electron mobility owing to the activation of intermolecular hopping charge transfer facilitated by stacking architecture.The two materials were utilized as ETMs in green phosphorescent organic light-emitting diodes.2DPTrz-ICz exhibited a superior external quantum efficiency of 21.5%,higher than that of the spirobifluorene-derived ETM.

关 键 词：electron transport layer INDOLOCARBAZOLE efficiency OLED 

分 类 号：TN383.1[电子电信—物理电子学] O626[理学—有机化学]