TY - JOUR
T1 - Synthesis of novel s-triazine/carbazole based bipolar molecules and their application in phosphorescent OLEDs
AU - Lu, Tianxing
AU - You, Jing
AU - Zhao, Dan
AU - Wang, Hua
AU - Miao, Yanqin
AU - Liu, Xicheng
AU - Xiao, Yin
AU - Li, Xianggao
AU - Wang, Shirong
N1 - Funding Information:
We acknowledge the financial support from National Natural Science Foundation of China (21176180) and Specialized Research Fund for the Doctoral Program of Higher Education (20130032110026).
Publisher Copyright:
© 2015, Springer Science+Business Media New York.
PY - 2015/9/13
Y1 - 2015/9/13
N2 - Three s-triazine/carbazole based bipolar molecules: 9,9′,9″-(1,3,5-triazine-2,4,6-triyl)tris(3,6-di-tert-butyl-carbazole) (TazTCz), 9,9′-(6-phenyl-1,3,5-triazine-2,4-diyl)bis(3,6-di-tert-butyl-carbazole) (PhTazDCz) and 9-(4,6-diphenyl-1,3,5-triazine-2-yl)-3,6-di-tert-butyl-carbazole (DPhTazCz) were synthesized and applied as host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs). The triplet state energy levels are ~2.86 eV for these compounds, ensured their application in blue PHOLEDs. X-ray single crystal structural analysis revealed a non-planar structure of TazTCz, which prevented the intermolecular close-packing in the solid state. X-ray diffraction spectra also confirmed that TazTCz and PhTazDCz could form amorphous films with spin-coating method. The bipolar characteristics of as-synthesized compounds were confirmed by carrier mobility measurement. The device parameters of blue PHOLEDs based on these compounds as host materials exhibit that the balance of electron and hole mobilities is benefit for reducing turn-on voltage and efficiency roll-off at high current density.
AB - Three s-triazine/carbazole based bipolar molecules: 9,9′,9″-(1,3,5-triazine-2,4,6-triyl)tris(3,6-di-tert-butyl-carbazole) (TazTCz), 9,9′-(6-phenyl-1,3,5-triazine-2,4-diyl)bis(3,6-di-tert-butyl-carbazole) (PhTazDCz) and 9-(4,6-diphenyl-1,3,5-triazine-2-yl)-3,6-di-tert-butyl-carbazole (DPhTazCz) were synthesized and applied as host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs). The triplet state energy levels are ~2.86 eV for these compounds, ensured their application in blue PHOLEDs. X-ray single crystal structural analysis revealed a non-planar structure of TazTCz, which prevented the intermolecular close-packing in the solid state. X-ray diffraction spectra also confirmed that TazTCz and PhTazDCz could form amorphous films with spin-coating method. The bipolar characteristics of as-synthesized compounds were confirmed by carrier mobility measurement. The device parameters of blue PHOLEDs based on these compounds as host materials exhibit that the balance of electron and hole mobilities is benefit for reducing turn-on voltage and efficiency roll-off at high current density.
UR - http://www.scopus.com/inward/record.url?scp=84939000204&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84939000204&partnerID=8YFLogxK
U2 - 10.1007/s10854-015-3254-2
DO - 10.1007/s10854-015-3254-2
M3 - Article
AN - SCOPUS:84939000204
SN - 0957-4522
VL - 26
SP - 6563
EP - 6571
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
IS - 9
ER -