Please use this identifier to cite or link to this item: https://doi.org/10.1039/b607923g
Title: Efficient 9-alkylphenyl-9-pyrenylfluorene substituted pyrene derivatives with improved hole injection for blue light-emitting diodes
Authors: Tang, C.
Liu, F.
Xia, Y.-J.
Xie, L.-H.
Wei, A.
Li, S.-B.
Fan, Q.-L.
Huang, W. 
Issue Date: 2006
Source: Tang, C., Liu, F., Xia, Y.-J., Xie, L.-H., Wei, A., Li, S.-B., Fan, Q.-L., Huang, W. (2006). Efficient 9-alkylphenyl-9-pyrenylfluorene substituted pyrene derivatives with improved hole injection for blue light-emitting diodes. Journal of Materials Chemistry 16 (41) : 4074-4080. ScholarBank@NUS Repository. https://doi.org/10.1039/b607923g
Abstract: Two efficient blue-light-emitting materials with stable diarylfluorene and hole-transporting pyrene groups, 9-alkoxyphenyl-9-pyrenylfluorene substituted pyrenes (EHOP1 and EHOP2), have been synthesized by Suzuki coupling reaction and have been fully characterized. They have extreme thermal stability in nitrogen with onset decomposition temperature over 430 °C. They are amorphous materials with Tg of 103 and 191 °C for EHOP1 and EHOP2, respectively. They show stable bright blue emission in the solid state. Due to the non-conjugated pyrene groups at C9 of the fluorene moieties, the absorption spectra of the two compounds showed some characteristic peaks and they showed improved hole-injection ability than conjugated fluorene derivatives. A preliminary simple three-layer blue light-emitting diode, i.e. ITO/TCTA (8 nm)/EHOP1 (30 nm)/BCP (45 nm)/Mg:Ag, was obtained without the need for a hole-injection layer, with high luminance of 11620 cd m-2, turn-on voltage of 4.0 V and current efficiency of 3.04 cd A-1. Furthermore, the device still had a considerable efficiency of 1.74 cd A-1, when the luminescence reaches its maximum. © The Royal Society of Chemistry 2006.
Source Title: Journal of Materials Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/91949
ISSN: 09599428
DOI: 10.1039/b607923g
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