Journal
JOURNAL OF LUMINESCENCE
Volume 183, Issue -, Pages 150-158Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2016.11.054
Keywords
Dendrimer; Multilayer organic light emitting diode; Solution process; Carbazole
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Funding
- University Malaya Chancellery High Impact Research Grant [UM.C/625/1/HIR/208]
- University Malaya Fundamental Research Grant [RP026A-15AFR, FP059-2014A]
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4, 4'-bis(3,6-bis(3, 6-ditert-pentyl-carbazol-9-yl)carbazol-9-yl)-2,2'-dimethylbiphenyl, a novel carbazole dendrimer, has been synthesized. This compound shows an excellent thermal stability with a high glass transition temperature of 283 degrees C and decomposition temperature of 487 degrees C. Density functional theory is used to investigate the frontier orbitals. It was found that the Highest Occupied Molecular Orbital and the Lowest Unoccupied Molecular Orbital levels of 4, 4'-bis(3,6-bis(3, 6-ditert-pentyl-carbazol-9-yl)carbazol-9-yl)-2,2'-dimethylbiphenyl are nearly degenerate to the next highest or lowest frontier orbitals. The electron rich outer dendrons along with Highest Occupied Molecular Orbital level of 5.24 eV as determined from cyclic voltammetry makes 4, 4'-bis(3,6-bis(3,6-ditert-pentyl-carbazol-9-yl)carbazol-9-yl)-2,2'-dimethylbiphenyl a good hole transporting material. This compound also shows a triplet energy of 2.83 eV. Solution processable multilayer red, green and blue phosphorescent organic light emitting diodes are fabricated having 4, 4'-bis(3,6-bis(3,6-ditert-pentyl-carbazol-9-yl)carbazol-9-yl)-2,2'-dimethylbiphenyl as a hole transporting host. It was found that the CIE-coordinates remain constant within a wide range of brightness (C) 2016 Elsevier B.V. All rights reserved.
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