TY - JOUR
T1 - Green-synthesized, low-cost tetracyanodiazafluorene (TCAF) as electron injection material for organic light-emitting diodes
AU - Yang, Bing
AU - Zhao, Jianfeng
AU - Wang, Zepeng
AU - Yang, Zhenlin
AU - Lin, Zongqiong
AU - Zhang, Yanni
AU - Li, Jiewei
AU - Xie, Linghai
AU - An, Zhongfu
AU - Zhang, Hongmei
AU - Weng, Jiena
AU - Huang, Wei
N1 - Publisher Copyright:
© 2019
PY - 2019/11
Y1 - 2019/11
N2 - 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.
AB - 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.
KW - Acceptor
KW - Electron-injection material
KW - Green-synthesis
KW - Organic light-emitting diode
KW - Tetracyanodiazafluorene (TCAF)
UR - http://www.scopus.com/inward/record.url?scp=85072570094&partnerID=8YFLogxK
U2 - 10.1016/j.cclet.2019.08.054
DO - 10.1016/j.cclet.2019.08.054
M3 - 文章
AN - SCOPUS:85072570094
SN - 1001-8417
VL - 30
SP - 1969
EP - 1973
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
IS - 11
ER -