TITLE

Controlling bulk aggregation state in semiconducting conjugated polymer solution

AUTHOR(S)
Chi-Chung Hua; Chih-Yuan Kuo; Show-An Chen
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123303
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Dynamic light scattering measurements disclosed the ubiquity of large aggregate species (i.e., generally above 100 nm in hydrodynamic radius) in the precursor solutions customarily used to fabricate polymer-based light-emitting diodes (PLEDs). Transformation of these species into nanoscale thin films is expected to influentially interfere with the performance of the fabricated PLEDs. Controlling these large aggregate species was noticed to require strategies at variance with the convectional ones of controlling the more localized aggregation state. The present observations suggest that compromising the bulk and the local solution aggregation states is essential in producing tunable and high-performance PLEDs.
ACCESSION #
34647444

 

Related Articles

  • Spectral conversion of InGaN ultraviolet microarray light-emitting diodes using fluorene-based red-, green-, blue-, and white-light-emitting polymer overlayer films. Heliotis, G.; Stavrinou, P. N.; Bradley, D. D. C.; Gu, E.; Griffin, C.; Jeon, C. W.; Dawson, M. D. // Applied Physics Letters;9/5/2005, Vol. 87 Issue 10, p103505 

    We report the fabrication of hybrid organic/inorganic semiconductor light-emitting devices that operate across the entire visible spectrum. The devices are based on a series of blue-, green-, and red-light-emitting polyfluorene materials that convert the emission from an array of micron-sized...

  • An interfacial instability in a transient wetting layer leads to lateral phase separation in thin spin-cast polymer-blend films. Heriot, Sasha Y.; Jones, Richard A. L. // Nature Materials;Oct2005, Vol. 4 Issue 10, p782 

    Spin-coating is a very widely used technique for making uniform thin polymer films. For example, the active layers in most experimental semiconducting polymer-based devices, such as light-emitting diodes and photovoltaics, are made this way. The efficiency of such devices can be improved by...

  • Highly polarized polymer light-emitting diodes utilizing friction-transferred poly(9,9-dioctylfluorene) thin films. Misaki, Masahiro; Ueda, Yasukiyo; Nagamatsu, Shuichi; Chikamatsu, Masayuki; Yoshida, Yuji; Tanigaki, Nobutaka; Yase, Kiyoshi // Applied Physics Letters;12/12/2005, Vol. 87 Issue 24, p243503 

    Polarized polymer light-emitting diodes (PLEDs) have been constructed utilizing friction-transferred poly(9,9-dioctylfluorene) (PFO) thin films. The friction transfer technique allows oriented PFO to be deposited directly onto an indium tin oxide anode without an alignment layer such as...

  • OLED ASSEMBLY: NO VACUUM REQUIRED. Miller, Matthew // EDN;6/12/2003, Vol. 48 Issue 13, p26 

    Chemists at the Georgia Institute of Technology have attached a solid-state fluorescent material used in organic light-emitting diodes (OLEDs) to a universal polymer backbone which will lead to a cost-effective manufacturing of OLED. Current OLED-assembly methods deposit the fluorescent...

  • Polymeric light-emitting diodes from molecularly thin poly(3-hexylthiophene) Langmuir–Blodgett films. Pal, A. J.; Östergård, T.; Paloheimo, J.; Stubb, H. // Applied Physics Letters;8/19/1996, Vol. 69 Issue 8, p1137 

    Light-emitting diodes based on molecularly thin films of a conjugated polymer have been fabricated. A few Langmuir–Blodgett layers of poly(3-hexylthiophene) have been used as the active emitting material of the devices. Even the thinnest devices with only 3 monolayers, each having a...

  • Increased efficiency in vertically segregated thin-film conjugated polymer blends for light-emitting diodes. Corcoran, N.; Arias, A. C.; Kim, J. S.; MacKenzie, J. D.; Friend, R. H. // Applied Physics Letters;1/13/2003, Vol. 82 Issue 2, p299 

    The effect of film morphology on the performance of conjugated polymer-blend light-emitting diodes (LEDs) has been investigated. Vertically segregated structures have been fabricated by varying the spinning conditions and solvents used so that phase separation normal to the substrate is induced....

  • Device performance and polymer morphology in polymer light emitting diodes: The control of thin film morphology and device quantum efficiency. Shi, Y.; Liu, J.; Yang, Y. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p4254 

    We present the results of a systematic study on how the processing conditions of spin casting affect the morphology of polymer thin films, and how the morphology affects polymer light-emitting diode (LED) performance. The absorption peaks of poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1,...

  • Photocurrent in an electron transporting luminescent polymer. Feller, F.; Monkman, A. P.; Monkman, A.P. // Applied Physics Letters;2/7/2000, Vol. 76 Issue 6 

    Photocurrent measurements have been carried out on thin films of poly(2,5-pyridinediyl), a promising polymer for applications in light-emitting diodes. The spectral dependence of the photocurrent has been recorded using the four possible directions of the applied electric field and illumination,...

  • Enhancement of organic magnetoresistance by electrical conditioning. Niedermeier, U.; Vieth, M.; Pätzold, R.; Sarfert, W.; von Seggern, H. // Applied Physics Letters;5/12/2008, Vol. 92 Issue 19, p192902 

    We demonstrate that electrical conditioning can be used as an efficient method to enhance the organic magnetoresistance effect in organic light emitting diodes. Depending on duration and intensity of the conditioning process the absolute value of the magnetoresistance effect can be increased...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics