Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development Page: 11 of 35
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Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development
PPG Industries, Inc.
Figure 10: A powered large area (a) green and (b) white "vertical blind" PHOLED device fabricated by UDC on
PPG's Float Glass-based integrated substrate for measurement of extraction enhancement from light extraction
Pyrolytic sol-gel spray coatings were evaluated as a candidate EEL technology due to its compatibility
with the large-scale float glass manufacturing process. The process was developed on a TamGlass system
that allowed the uniform coating of 12"x12" substrates. Process parameters such as glass temperature,
spray time, and spray gun pressure were optimized to achieve various combinations of haze/scattering and
transmission levels. Durability tests were done to ascertain the compatibility of these EELs with UDC's
device fabrication process, which identified some issues. The device fabrication process was modified to
accommodate the EEL layers. Initial small scale (2mm x 2mm) devices showed enhancement factors of
1.28x. However, the results could not be confirmed with large area devices. The process for fabricating
large area devices is slightly different and more demanding than the smaller devices and therefore
magnified the durability issues in these layers. This was due to delamination of the sol-gel films because
of high-temperature patterning photoresist baking step followed by exposure of the films to the ITO acid
etch solution. An example of a failed sol-gel coating is shown in Figure 11.
Page 11 of 35
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Benton, Scott & Bhandari, Abhinav. Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development, report, September 30, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc831063/m1/11/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.