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Enhanced efficiency and brightness in organic light- emitting devices with MoO3 as hole-injection layer

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Abstract

Theorganic light-emitting devices (OLEDs) using 4,4’,4’’-tris{N-(3-methylphenyl)-N-phenylamin}triphenylamine (m-MTDATA) and MoO3 or 1,3,5-triazo-2,4,6-triphosphorine-2,2,4,4,6,6-tetrachloride (TAPC) and MoO3 as the hole-injection layer (HIL) were fabricated. MoO3 can be expected to be a good injection layer material and thus enhance the emission performance of OLED. The highest occupied molecular (HOMO) of MoO3 is between those of m-MTDATA or TAPC and N,N’-bis-(1-naphthyl)-N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB), which reduces the hole-injection barrier and improves the luminance of the OLEDs. The current efficiency is improved compared with that of the device without the MoO3 layer. The highest luminous efficiency of the device with 2-nm-thick MoO3 as HIL is achieved as 5.27 cd/A at 10 V, which is nearly 1.2 times larger than that of the device without it. Moreover, the highest current efficiency and power efficiency of the device with the structure indium-tin oxide (ITO)/TAPC (40 nm)/MoO3 (2 nm)/TcTa:Ir(ppy)3 (10%, 10 nm)/ tris-(8-hydroxyquinoline) aluminium (Alq) (60 nm)/LiF (1 nm)/Al are achieved as 37.15 cd/A and 41.23 lm/W at 3.2 V and 2.8 V, respectively.

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DOI:10.1007/s11801-017-6215-6

所属栏目:Devices

基金项目:This work has been supported by the Major Project of Science and Technology Office of Fujian Province of China (No.2014H0042), the Natural Science Foundation of Fujian Province of China (No.2015J01664), and the Project of Science and Technology Research of Quanzhou City in Fujian Province of China (Nos.2013Z125 and 2014Z137).

收稿日期:2016-10-03

修改稿日期:2016-11-13

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作者单位    点击查看

YANG Hui-shan:College of Physics and Information Engineering, Quanzhou Normal University, Quanzhou 362000, China
WU Li-shuang:College of Physics and Information Engineering, Quanzhou Normal University, Quanzhou 362000, China

联系人作者:YANG Hui-shan(yanghuishan1697@163.com)

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引用该论文

YANG Hui-shan,WU Li-shuang. Enhanced efficiency and brightness in organic light- emitting devices with MoO3 as hole-injection layer[J]. 光电子快报(英文版), 2018, 14(1): 29-32

YANG Hui-shan,WU Li-shuang. Enhanced efficiency and brightness in organic light- emitting devices with MoO3 as hole-injection layer[J]. Optoelectronics Letters, 2018, 14(1): 29-32

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