Effect of substituents on the properties of indolo[3,2- b]carbazole-based hole-transporting materials
Three new compounds based on indolo[3,2- b]carbazole,2,8-bis(4-diphenylaminophenyl)-5,11-di- n-octylindolo[3,2- b]carbazole ( BTOICZ), 2,8-bis(9,9′-di- n-butylfluorenyl)-5,11-di- n-octylindolo[3,2- b]carbazole ( BFOICZ) and 2,8-bis[ N-( n-butyl)carbazolyl]-5,11-di- n-octylindolo[3,2- b]carbazole ( B...
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Published in | Organic electronics Vol. 8; no. 6; pp. 673 - 682 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.12.2007
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Three new compounds based on indolo[3,2-
b]carbazole,2,8-bis(4-diphenylaminophenyl)-5,11-di-
n-octylindolo[3,2-
b]carbazole (
BTOICZ), 2,8-bis(9,9′-di-
n-butylfluorenyl)-5,11-di-
n-octylindolo[3,2-
b]carbazole (
BFOICZ) and 2,8-bis[
N-(
n-butyl)carbazolyl]-5,11-di-
n-octylindolo[3,2-
b]carbazole (
BCOICZ), as hole-transporting materials have been synthesized by Suzuki coupling reaction. The effects of substituents on the optical, thermal and electrochemical properties of indolo[3,2-
b]carbazole derivatives have been studied carefully. Electroluminescent (EL) devices using these compounds as hole-transporting layer in combination with Alq
3 as electron-transporting and emitting layer have been fabricated and characterized. The devices based on
BTOICZ or
BFOICZ showed green emission at 526
nm, while the device based on
BCOICZ emitted very weak light. The turn-on voltages are 4.1 and 5.4
V for
BTOICZ and
BFOICZ, respectively. The maximal luminance efficiencies are 0.738 and 0.767
lm/W for
BTOICZ and
BFOICZ, respectively. The difference of the EL performances of these compounds reveals that the substituent effects have great effect on the hole-transporting performance of the indolo[3,2-
b]carbazole-based compounds. |
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ISSN: | 1566-1199 1878-5530 |
DOI: | 10.1016/j.orgel.2007.05.001 |