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White polymeric light-emitting diode based on a fluorene polymer/Ir complex blend system

Al Attar, H.A.; Monkman, A.P.; Tavasli, M.; Bettington, S.; Bryce, M.R.

Authors

H.A. Al Attar

M. Tavasli

S. Bettington



Abstract

Efficient white-polymeric light-emitting diodes (PLED) were fabricated as a single active layer containing blue-emitting poly(9,9-bis(2-ethylhexyl)fluorene-2,7-diyl) endcapped with bis(4-methylphenyl)phenylamine; (PF2/6am4), and yellow-orange-emitting iridium [tri-fluorenyl] pyridine complex [Ir(Fl(3)Py)(3)]. The fluorene-like ligands in the blended device prevent phase segregation and also enhance energy transfer from the polymer host to the guest due to efficient overlap of wave function (Dexter process) and host singlet emission and guest absorption bands (Forster process) which reduces the loading level required to produce white emission. The two emitted colors complement each other and doping levels of 2%-3% produce white emission. Above a certain current density, depending on the doping level, the device Commission Internationale de L'Eclairage (CIE) coordinates become bias independent and a stabilized white emission can be obtained. A white-emitting PLED (coordinates 0.348, 0.367) of peak external quantum efficiency of 2.8%, and luminance of 16000 cd/m(2) at applied voltage of 5 V (i.e., 4.57 cd/A) was obtained. (C) 2005 American Institute of Physics.

Citation

Al Attar, H., Monkman, A., Tavasli, M., Bettington, S., & Bryce, M. (2005). White polymeric light-emitting diode based on a fluorene polymer/Ir complex blend system. Applied Physics Letters, 86(12),

Journal Article Type Article
Publication Date 2005-03
Journal Applied Physics Letters
Print ISSN 0003-6951
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 86
Issue 12