Polyfluorene polymer light-emitting

Keywords Device performance Electron-transport moiety Hole-transport moiety Polyfluorenes Polymer light-emitting diode... 

T. van Woudenbergh, J. Wildeman, P.W.M. Blom, J.J.A.M. Bastiaansen, and B.M.W. Langeveld-Voss, Electron-enhanced hole injection in blue polyfluorene-based polymer light-emitting diodes, Adv. Fund. Mater., 14 677-683, 2004. 

A. Pogantsch, F.P. Wenzl, E.J.W. List, G. Leising, A.C. Grimsdale, and K. Mullen, Polyfluorenes with dendron side chains as the active materials for polymer light-emitting devices, Adv. Mater., 14 1061-1064, 2002. 

Q. Peng, M. Xie, Y. Huang, Z. Lu, and D. Xiao, New series of highly phenyl-substituted polyfluorene derivatives for polymer light-emitting diodes, J. Polym. ScL, Part A Polym. Chem., 42 2985-2993, 2004. 

Another way to introduce Ir(III) complexes into the main-chain of polyfluorenes was realized by Suzuki polycondensation of fluorene segments and /3-diketone ligand chelated with Ir(III) chloride-bridged dimmer (polymer 26 and 27) [34,35]. A saturated red-emitting polymer light-emitting diode was achieved from the device ITO/PEDOT/polymer 27 + PBD (40%)/Ba/Al with the maximum external quantum efficiency of 0.6% at the current density (J) of 38.5 mA/cm2 and the maximum luminance of 541 cd/m2 at 15.8 V. 

Polyfluorenes have been developed as promising candidates in organic electronics applications such as polymer light-emitting diodes (PLEDs) and polymer transistors. In the early stages of development, the relationships between polymer structure and device performance were investigated. This is still an important... 

Cardozo, B.L., and Pang, S.W (2008) Patterning of polyfluorene based polymer light emitting diodes by reversal imprint lithography./. Vac, Sci. Technol. B, 26 (6), 2385-2389. 

J.-H. Lee and D.-H. Hwang, Alkoxyphenyl-substituted polyfluorene a stable blue-light-emitting polymer with good solution processability, Chem. Commune. 2836-2837, 2003. 

S. Setayesh, A.C. Grimsdale, T. Weil, V. Enkelmann, K. Mullen, F. Meghdadi, E.J.W. List, and G. Leising, Polyfluorenes with polyphenylene dendron side chains toward non-aggregating, light-emitting polymers, J. Am. Chem. Soc., 123 946-953, 2001. 

Light-emitting polymers [46,48] are a more recent development and may eventually prove superior to small-molecule OLED. Typical polymers are the green poly(para-phenylene vinylene) (PPV 53), the orange-red dialkoxy derivatives (54), and the blue polyfluorene (55) [48],... 

Rhenium(I) tricarbonyl-2,2 -bipyridine moieties were used to cap both ends of a poly fluorine, yielding Re-capped Re(bpy)(CO)3(py)-X-(py)(CO)3(bpy)Re 2+ polymers, where X = polyfluorene [51, 52], The polymers with and without the Re caps were spin-coated from their solutions in CH2C12 onto an ITO surface previously modified with a layer of poly(styrene sulfonic acid), doped with poly(ethylenedioxythiophene). The LED (light-emitting device) was then topped with a layer of Ca/Al. The photoluminescence (PL) and electroluminescence seen were consistent with the presence of [Re(bpy)(CO)3(py)]+ [158],... 

Abstract Poly(dibenzosilole)s are an emerging class of polymers with similar optoelectronic properties to polyfluorenes. With increased stability towards oxidation, several poly(dibenzosilole)-based devices, such as light emitting diodes, have shown improved performance over their polyfluorene counterparts. As a consequence of reduced conjugation in the polymer chain, some poly(dibenzosilole)s have high triplet excited state energies, which make them suitable hosts for blue triplet emitters in electrophosphores-cent devices. 

Scheme 2 White light-emitting polymers based on polyfluorene derivatives with Ir complex on the side-chain...

Introducing red-light emitting Ir(III) complex and BT into the main-chain of polyfluorene (polymer 23) can realize white-light emission. A WPLED with a structure of ITO/PEDOT PSS/PVK/polymer 23/CsF/Al showed a maximum external quantum efficiency of 3.7% and the maximum luminous efficiency of 3.9 cd/A at the current density of 1.6 mA/cm2 with the CIE coordinates of (0.33, 0.34). The maximum luminance of 4180 cd/m2 is achieved at the current density of 268 mA/cm2 with the CIE coordinates of (0.31,... 

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