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Polymer light emitting diodes and poly(di--octylfluorene) thin films as fabricated with a microfluidics applicator
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10.1063/1.2349467
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    Affiliations:
    1 Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
    2 Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
    3 Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
    4 Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
    5 Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 and Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
    6 Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
    a) Present address: Physics Department, Montana State University, Bozeman, MT 59717.
    b) Present address: SonoPlot LLC, Madison, WI 53713.
    c) Electronic mail: mwinokour@wisc.edu
    J. Appl. Phys. 100, 073510 (2006); http://dx.doi.org/10.1063/1.2349467
/content/aip/journal/jap/100/7/10.1063/1.2349467
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2349467
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Top: schematic layout of the microplotter system that provides micron positional precision. Bottom: a photograph of the micropipette/piezoelectric crystal assembly and a typical test pattern of long lines on the sapphire substrate.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic drawing of a working PF8 LED design as fabricated with the microplotter: (a) general spatial layout and (b) vertical layout.

Image of FIG. 3.
FIG. 3.

Fluorescence microscopic images of individual microplotter traces at as indicated tip speeds.

Image of FIG. 4.
FIG. 4.

(Color online) Polarizing optical microscope images (at two magnifications) of a microplotter trace at the position of initial deposition.

Image of FIG. 5.
FIG. 5.

Profilometer traces of PF8 thin film lines as fabricated by the microplotter at as indicated tip speeds. The widths range from and the large rise in film thickness at the fluid contact line is most pronounced at low deposition speeds. Top: lines formed using 1% w/w PF8/CB solution. Middle: lines formed using 2% w/w PF8/CB solution. Bottom: Profilometer traces of PF8 thin films produced by drop casting from the indicated PF8/CB solutions.

Image of FIG. 6.
FIG. 6.

(Color online) Franck-Condon analysis of PL data (see text for details) from [(a) and (b)] conventional spin cast films (from a 1% w/w PF8/toluene solution) at 70 and , respectively, assuming that emission originating from phase chains superimposes on a broad background (black dashed line). [(c) and (d)] Film deposited at (from 2% w/w PF8/CB solution) assuming that emission originates from a superposition the phase (lower energy ZPL, green), segments (higher energy ZPL, blue), and a broad background (black dashed line) at (c) and at (d).

Image of FIG. 7.
FIG. 7.

Temperature dependent PL spectra from film deposited at (from 2% w/w PF8/CB solution) on thermal cycling: (a) from (bottom) up to (middle) and back down to (top); (b) same film on second thermal cycle from (bottom) up to (middle) and back down to . All spectra have been offset and rescaled for clarity.

Image of FIG. 8.
FIG. 8.

(Color online) Example of blue light emission from PF8 PLED fabricated with the microplotter. The image is slightly distorted by the 45° rotation of the PLED substrate with respect to the CCD viewing camera. (Color scale, online version, is not accurate.)

Image of FIG. 9.
FIG. 9.

Example electroluminescence spectra from two different PLED devices operated at the indicated voltages.

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/content/aip/journal/jap/100/7/10.1063/1.2349467
2006-10-09
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Polymer light emitting diodes and poly(di-n-octylfluorene) thin films as fabricated with a microfluidics applicator
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2349467
10.1063/1.2349467
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