Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development Page: 24 of 35
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Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development
PPG Industries, Inc.
in optics, adhesion, or hardness. A more comprehensive durability test matrix was constructed based on
detailed fabrication process information provided by UDC, and augmented with some related coating tests
that may provide more rapid screening results for these types of processes.
By selecting an alternate scattering material and making minor modification to the dispersion and spin-
coat application processes, good quality coatings with over 80% haze were obtained. A second set of
sample substrates with sol-gel scattering IEL layers exhibiting 40% to 60% haze were prepared for device
fabrication. The samples are in process at the time of this report preparation. Samples from this set were
also provided for the qualitative extraction efficiency comparison (section below), with very encouraging
Figure 25: Comparison of two sol-gel IEL coatings on PPG Solarphire PV float glass, at approximately 10% and
80% haze. The samples are spin coat-applied 6"x6" substrates.
The sol-gel IEL coatings were applied by spin coating to 2 mm thick PPG Solarphire PV float glass
samples ranging in size from 2" x 2" for initial screening experiments to 6" x 6" for test device
fabrication. Scale up to commercial manufacturing production is anticipated to be achievable by scale up
of the spin coating technique for sample sizes having a diagonal of approximately 20". Beyond that,
commercial slot/die, curtain, meniscus, and spray technology should allow for the coating of any desired
part size by a rapid continuous process.
Finally, a number of other approaches were evaluated. These involved alternative host matrices, such as
in-house sol-gel matrices and other commercially-available coating resins, for the scattering particles.
These matrices yielded cured coatings on sample substrate which conformed to the pattern illustrated in
Figure 24 and passed the critical durability tests for device fabrication processes, thus illustrating the
potential generality of this approach.
Qualitative Extraction Efficiency Comparison:
Since the device yield on embedded particle IEL substrates was low, there was a need to measure the
extraction enhancement factors, without fabricating the actual devices, so that the appropriate
combination of optical properties could be determined and efforts could be focused on fabricating defect-
free IEL substrates. Offline extraction enhancement measurements were made for various IEL samples
Page 24 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/m1/24/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.