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Proceedings Paper

High-bright and efficient green light-emitting diode using poly[2-(9`,9`-bishexylfluorenyl)-1,4-phenylenevinylene]
Author(s): Sang Ho Lee; Bo-Bin Jang; Tetsuo Tsutsui
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Paper Abstract

The poly[2-(9',9'-bishexylfluorenyl)-1,4- phenylenevinylene] (BHF-PPV), which is PPV containing 9,9- bishexylfluorene as a pendant group, was synthesized by the modified Gilch dehydrohalogenation polymerization of the corresponding bischloromethyl-substituted benzene monomer. The energy levels of the highest occupied molecular orbital and the lowest unoccupied molecular orbital of BHF-PPV were 5.35 and 2.94 eV as determined by cyclic voltammetry. Band gap, estimated from both cyclic voltammetry and optical absorption measurement, agrees well to be 2.41 eV. The EL spectrum showed two peaks at 504 and 535 nm, which very closely resembled the PL spectrum of the polymer film, demonstrating that the PL and EL originate from the same excited state. Blue-green LED was fabricated using BHF-PPV as the emissive layer, PEDOT:PSS as the hole-injection layer, and Mg-Ag alloy as the cathode. The device emitted bright blue-green light with turn-on voltage of 3.0 V and exhibited luminance efficiency and power efficiency of 0.64 cd/A and 0.45 lm/W, respectively, at the luminance of 105.1 cd/m2 driven at the voltage of 4.5 V and current density of 16.37 mA/cm2.

Paper Details

Date Published: 2 February 2001
PDF: 6 pages
Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); doi: 10.1117/12.416911
Show Author Affiliations
Sang Ho Lee, CREST/Japan Science and Technology Corp. (Japan)
Bo-Bin Jang, CREST/Japan Science and Technology Corp. (Japan)
Tetsuo Tsutsui, CREST/Japan Science and Technology Corp. and Kyushu Univ. (Japan)


Published in SPIE Proceedings Vol. 4105:
Organic Light-Emitting Materials and Devices IV
Zakya H. Kafafi, Editor(s)

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