Highly efficient polymer blends from a polyfluorene derivative and PVK for LEDs

Date

2009-11-27

Author

NOWACKI, Bruno
IAMAZAKI, Eduardo
Çırpan, Ali
KARASZ, Frank
ATVARS, Teresa D.Z.
AKCELRUD, Leni

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

123
views

0
downloads

The photophysical and electroluminescent properties of blends of a polyfluorene derivative of the PPV type, poly[(9,9-dihexyl-9H-fluorene-2,7-diyl)-1,2-ethenediyl-1,4-phenylene-1,2-ethenediyl] (labeled as LaPPS16) and poly(vinylcarbazole) - PVK are presented and discussed in terms of the operating light emission mechanisms. Static and dynamic fluorescence measurements and morphology data showed a powerful exciton migration from the host (PVK) to the guest (LaPPS16) resulting in emission coming from solely LaPPS16, even when in concentrations small as 1%. Electroluminescence was greatly enhanced with the blending; increases of 18 times in efficiency and 20 times in luminance were achieved in the blend containing 20% LaPPS16, with 3 V applied voltage.

Subject Keywords

Organic Chemistry, Polymers and Plastics

URI

https://hdl.handle.net/11511/37211

Journal

Polymer

DOI

https://doi.org/10.1016/j.polymer.2009.09.056

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Long wavelength photosensitizers in photoinitiated cationic polymerization: The effect of quinoxaline derivatives on photopolymerization Corakci, Bengisu; Hacioglu, Serife O.; Toppare, Levent Kamil; Bulut, Umut (Elsevier BV, 2013-06-07) This article describes the use of functionalized quinoxaline derivatives as photosensitizers for diaryliodonium salt photoinitiators. Highly conjugated compounds with good absorption bands in long wavelength UV and visible region are presented. These versatile intermediates facilitate photoinitiated cationic polymerization of commercially important monomers such as cyclic ethers and vinyl epoxides. Polymerizations were carried out using long wavelength UV light in the presence of diphenyliodonium hexafluoro...
ALTERNATING CYCLOPOLYMERIZATION OF ALLYL TRANS-CINNAMATE AND MALEIC-ANHYDRIDE RZAEV, ZMO; AKOVALI, G; MEDYAKOVA, LV (Elsevier BV, 1994-01-01) Some features of the radical copolymerization of allyl cinnamate bifunctional monomers, containing donor (allyl)-acceptor (beta-phenylacryl) double bonds in the molecule, with maleic anhydride have been revealed. The kinetic parameters of the reactions, including their complex-formation, cyclization and copolymerization constants, as well as the ratios of chain growth rates for the participation of monomeric charge-transfer complexes and free monomers, are all determined. It has been established that an alt...
ELECTROINITIATED POLYMERIZATION OF ACRYLAMIDE BY DIRECT ELECTRON-TRANSFER HACIOGLU, B; Akbulut, Ural; Toppare, Levent Kamil (Wiley, 1989-10-01) Electroinitiated polymerization of acrylamide was carried out in acetonitrile–tetrabutylammonium fluoroborate by electrolytic reduction of monomer. It was shown by cyclic voltammetry that direct electron transfer from the cathode to the monomer can be achieved in this solvent–electrolyte system. Reduction peak potentials measured by cyclic voltammetry indicated that sodium salts will interfere with such a mechanism. Since the reduction peak potential of sodium salt and dimethylformamide are found to be lowe...
Furoxan Derivatives of Pyrene - A DFT Study Türker, Burhan Lemi (Informa UK Limited, 2018-01-01) Furoxan-fused pyrenes and their dinitroso derivatives (obtained by furoxan ring opening) are considered for density functional treatment at the level of B3LYP/6-31G(d,p). Embedded benzofuroxan moiety in the furoxan-fused pyrene system is thought to undergo ring opening and reclosure process analogously to benzofuroxan itself. The stabilities, structural features, NICS(0) values, IR, and UV-VIS spectral aspects, etc., are investigated comparatively for these isomeric furoxan-fused pyrenes and their isomeric ...
Dibenzophenazine Derivatives as Visible Photosensitizers for Diaryliodonium Salts Bulut, Umut; Kolay, Merve; Tarkuc, Simge; Toppare, Levent Kamil (Wiley, 2011-08-01) The use of two dibenzo[a,c]phenazine derivatives, 10,13-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)dibenzo[a,c]phenazine and 10,13-bis(4-hexylthiophen-2-yl)dibenzo[a,c]phenazine are reported as photosensitizers for diaryliodonium salt photoinitiators. Novel dyes based on the dibenzo[a,c]phenazine skeleton are shown to be efficient in carrying out the cationic photopolymerizations. Representative examples of different types of monomers including epoxide, and vinyl monomers are polymerized in the presence o...

Citation Formats

B. NOWACKI, E. IAMAZAKI, A. Çırpan, F. KARASZ, T. D. Z. ATVARS, and L. AKCELRUD, “Highly efficient polymer blends from a polyfluorene derivative and PVK for LEDs,” Polymer, pp. 6057–6064, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37211.