(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.
(Color online) Schematic drawing of a working PF8 LED design as fabricated with the microplotter: (a) general spatial layout and (b) vertical layout.
Fluorescence microscopic images of individual microplotter traces at as indicated tip speeds.
(Color online) Polarizing optical microscope images (at two magnifications) of a microplotter trace at the position of initial deposition.
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.
(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).
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.
(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.)
Example electroluminescence spectra from two different PLED devices operated at the indicated voltages.
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