Citation: Yang Bing, Zhao Jianfeng, Wang Zepeng, Yang Zhenlin, Lin Zongqiong, Zhang Yanni, Li Jiewei, Xie Linghai, An Zhongfu, Zhang Hongmei, Weng Jiena, Huang Wei. Green-synthesized, low-cost tetracyanodiazafluorene (TCAF) as electron injection material for organic light-emitting diodes[J]. Chinese Chemical Letters, ;2019, 30(11): 1969-1973. doi: 10.1016/j.cclet.2019.08.054 shu

Green-synthesized, low-cost tetracyanodiazafluorene (TCAF) as electron injection material for organic light-emitting diodes

Yang Bing ^a,1 ,
Zhao Jianfeng ^a,*,1, ,
Wang Zepeng ^a ,
Yang Zhenlin ^b ,
Lin Zongqiong ^a,c ,
Zhang Yanni ^a ,
Li Jiewei ^a ,
Xie Linghai ^b ,
An Zhongfu ^a ,
Zhang Hongmei ^b,*, ,
Weng Jiena ^c,*, ,
Huang Wei ^a,b,c,**,

a.
Key Laboratory of Flexible Electronics(KLOFE) & Institute of Advanced Materials(IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University(Nanjing Tech), Nanjing 211816, China
b.
Key Laboratory for Organic Electronics & Information Displays(KLOEID) and Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
c.
Shaanxi Institute of Flexible Electronics(SIFE), Northwestern Polytechnical University(NPU), Xi'an 710072, China

^**

iamjfzhao@outlook.com

iamhmzhang@njupt.edu.cn

iamjnweng@nwpu.edu.cn

iamwhuang@njtech.edu.cn

Received Date: 5 June 2019
Revised Date: 29 July 2019
Accepted Date: 29 August 2019
Available Online: 7 November 2019

Figures(5)

Two electron-deficient azaacenes including di- and tetra-cyanodiazafluorene (DCAF and TCAF) with the advantages of deep lowest unoccupied molecular orbital (LUMO), green-synthesis, low-cost, simply purification method, excellent yields have been obtained, characterized and used as electron injection materials (EIMs) in three groups of electroluminescence devices. Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V, stronger maximum luminance intensity of 31, 549 cd/m², higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53, 6.7, 9.3 and 15.3 times than that of device A with DCAF as EIMs, respectively. The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device, deeper LUMO (-4.52 eV), and stronger electronic affinity. Best external quantum efficiency of 16.56% was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer. As a new comer of acceptor family, TCAF would push forward organic electronics with more fascinating and significant applications.
- Green-synthesis,
- Acceptor,
- Tetracyanodiazafluorene (TCAF),
- Electron-injection material,
- Organic light-emitting diode
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