Enhanced Hole-Injection Property in an OLED with a Self-assembled Monolayer of Hole-Transporting TPD on Thin Au as the Anode  

作　　者：Zhi Shang Dongzhi Liu Tianyang Wang Xi Yu Baili Li Wei Li Wenping Hu Xueqin Zhou 

机构地区：[1]School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China [2]Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China [3]Tianjin Engineering Research Center of Functional Fine Chemicals, Tianjin 300350, China [4]Tianjin Key Laboratory of Molecular Optoelectronic Science,Department of Chemistry, School of Science, Tianjin University, Tianiin 300072, China

出　　处：《Transactions of Tianjin University》2018年第6期580-586,共7页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21506151,21576195 and 21776207)

摘　　要：A thioester-functionalized triphenylamine hole-transporting molecule （TPD-SAc） was synthesized and self-assembled to form a monolayer on an ultra-thin Au film supported on indium-tin oxide glass. The modified surface was characterized by aqueous contact angle, ellipsometer, atomic force microscopy, X-ray photoelectron spectroscopy, and ultraviolet pho- toelectron spectrometer to substantiate the formation of compact and pinhole-free monolayers. The modified organic light emitting diode device [indium-tin oxide/Au （5 nm）/self-assembled monolayers （SAM）/TPD （50 nm）/Alq3 （40 nm）/TPBI （15 nm）/LiF （1 nm）/A1 （100 nm）] showed a luminance of 7303.90 cd/m^2 and a current efficiency of 8.49 cd/A with 1.78 and 2.29-fold increase, respectively, compared to the control device without SAM. The improvements were attributed to the enhanced compatibility of the organic-inorganic interface, matched energy level by introduction of an energy mediating step and superior hole-injection property of SAM molecules.A thioester-functionalized triphenylamine hole-transporting molecule(TPD-SAc) was synthesized and self-assembled to form a monolayer on an ultra-thin Au film supported on indium-tin oxide glass. The modified surface was characterized by aqueous contact angle, ellipsometer, atomic force microscopy, X-ray photoelectron spectroscopy, and ultraviolet photoelectron spectrometer to substantiate the formation of compact and pinhole-free monolayers. The modified organic light emitting diode device [indium-tin oxide/Au(5 nm)/self-assembled monolayers(SAM)/TPD(50 nm)/Alq_3(40 nm)/TPBI(15 nm)/LiF(1 nm)/Al(100 nm)] showed a luminance of 7303.90 cd/m^2 and a current efficiency of 8.49 cd/A with 1.78 and 2.29-fold increase, respectively, compared to the control device without SAM. The improvements were attributed to the enhanced compatibility of the organic–inorganic interface, matched energy level by introduction of an energy mediating step and superior hole-injection property of SAM molecules.

关 键 词：TPD-SAc AU Self-assembled monolayer Organic light emitting diode Hole injection 

分 类 号：TN383.1[电子电信—物理电子学]