Optical and electroluminescent properties of polyfluorene copolymers and their blends

Date

2005-01-26

Author

Çırpan, Ali
KARASZ, Frank E.

Metadata

Show full item record

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

Item Usage Stats

148
views

0
downloads

Light emitting properties of several polyfluorene (PF) copolymers (P1-P4) and their blends have been investigated. Light emitting diodes were fabricated with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al. The EL peak wavelengths were 421 nut (violet), 505, 513 nm (green) and 570 nm (yellow) for PF copolymers and 510,535 nm (green) for P1/P2 and P1/P3 blends, respectively. Forster energy transfer in the photoluminescence and electroluminescence of the polymer blends P1/P2 and P1/P3 was studied. The LED using the polymer blend P1/P2 showed a turn-on voltage of 2.5 V and a brightness of 5 X 10(4) cd/m(2) at 7 V. The highest external quantum efficiency was observed to be 3.71% at 5 V. Upon addition of 20 wt% of the green emitter P2 to the violet emitter P1, the device efficiency increased from 1.18 to 3.71%.

Subject Keywords

Organic Chemistry, Polymers and Plastics

URI

https://hdl.handle.net/11511/46038

Journal

Polymer

DOI

https://doi.org/10.1016/j.polymer.2004.11.107

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Electrochemical polymerisation of 2-aminofluorene in ethylalcohol/water medium Imamoglu, T; Önal, Ahmet Muhtar (Elsevier BV, 2004-08-01) Electrochemical polymerisation of 2-aminofluorene, 2AF, was investigated in ethylalcohol/water mixture (3:2, v:v) in the presence of HClO4 as the supporting electrolyte via constant potential electrolysis, CPE. Prior to CPE, electrochemical behaviour of the monomer was investigated in the same solvent electrolyte couple utilising cyclic voltammetry, CV. Electrochemical polymerisation of the monomer yielded insoluble, dark bluish-green, conducting polymer deposit on the electrode surface. Characterisation of...
Optical and vibrational properties of nickel integrated germanium Zintl ion clusters Ogun, Esra; Esentürk, Okan; Nalbant Esentürk, Emren (Elsevier BV, 2019-05-01) Vibrational and optical properties of Ni-Ge clusters ([Ni2Ge9(PPh3)](2-), [Ni6Ge13(CO)(5)](4-)) have been investigated via UV-Vis, FTIR, and Fluorescence spectroscopies. Moreover, frequency and time-dependent (TD) electronic transition calculations have been performed to better characterize experimental findings, due to the scarcity of vibrational and optical spectroscopic studies on these type of clusters in the literature. UV-Vis spectroscopic analyses demonstrate a broad absorption band, with a maximum a...
Comparison of crystallinities of high density polyethylene determined by different techniques Akovali, G; Atalay, A (Elsevier BV, 1997-01-01) The differences in the crystallinities of HDPE samples conditioned by three different procedures with different cooling rates were followed by use of FTIR, DSC and X-ray scattering techniques. From FTIR, relative values of crystallinities are obtained and if absolute values obtained from DSC and X-ray scattering are compared, the latter yielded higher values. All three groups of results showed the expected trend of increase of crystallinities with decrease of rate of cooling. (C) 1997 Elsevier Science Ltd.
RADIATION-INDUCED AND ELECTROINITIATED POLYMERIZATION OF ALLYLBENZENE SOUSY, K; USANMAZ, A; Önal, Ahmet Muhtar (Elsevier BV, 1990-08-01) Radiation-induced and electroinitiated polymerization of allylbenzene has been investigated. Radiation-induced polymerization at room temperature was found to give mainly dimers and trimers with a maximum yield of 5%. Electroinitiated polymerization of the monomer yielded insoluble polymer films on the surface of the anode together with low molecular weight polymers in the bulk solution. The effects of temperature and monomer concentration on the rate of electroinitiated polymerization were also studied. Th...
Investigation of pi-pi Interactions between TNT and (R)-Hexahelicene Celik Bayar, Caglar; Türker, Burhan Lemi (Informa UK Limited, 2020-08-01) The detection of an energetic molecule TNT is an important issue especially in military applications and as a result many of the studies focused on this subject in the literature. In this study, except from the literature, the possible interactions between TNT and polycyclic aromatic chiral compound (R)-Hexahelicene were examined theoretically in terms of non-covalent pi-pi interactions, theoretically. It was observed that (R)-Hexahelicene had such interactions with TNT via the 2nd and 3rd six-membered ring...

Citation Formats

A. Çırpan and F. E. KARASZ, “Optical and electroluminescent properties of polyfluorene copolymers and their blends,” Polymer, pp. 811–817, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46038.