Electroluminescence performance of organic light-emitting devices with KCl inside hole transport layer |
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Authors: | Enyu Zhou Zhaoyue Lv Zhenbo Deng Hongyu Wang Denghui Xu Zheng Chen Wei Wei Bo Peng Yan Zhang |
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Institution: | aState Key Laboratory for Advanced Photonic Materials & Devices, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, PR China;bInstitute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, PR China;cDepartment of Mathematics and Physics, Beijing Technology and Business University, Beijing 100037, PR China |
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Abstract: | A new multilayer organic light-emitting device (OLED) is fabricated by inserting kalium chloride (KCl) thin layer (1 nm) into hole transport layer (HTL). It has the configuration of ITO/NPB(15 nm)/KCl(1 nm)/NPB(25 nm)/Alq3(60 nm)/KCl(1 nm)/Al. The electroluminescence (EL) result shows that the performance of the novel device has obviously improvement compared with the normal structure (ITO/NPB(40 nm)/Alq3(60 nm)/KCl(1 nm)/Al). The EL and efficiency are about 1.4 and 1.3 times than that of conventional device. The suggested mechanism is that the KCl layer in N,N′-diphenyl-N,N′-bis(1-napthyl–phenyl)-1,1′-biphenyl-4,4′-diamine (NPB) can block the holes of NPB and then balance the holes and electrons. The better recombination of holes and electrons is beneficial to the enhancing properties of OLED. |
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Keywords: | KCl Hole-blocking layer Multilayer organic light-emitting device |
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