Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development Page: 10 of 35
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Recovery Act: Low Cost Integrated Substrate for OLED Lighting Development
PPG Industries, Inc.
selected on the basis of scalability and compatibility with glass manufacturing. For screening purposes, a
bench-top system was developed (Figure 8) to qualitatively compare the external extraction layers.
Glass with Extraction Layer
Figure 8: A schematic of a table top system developed to screen the external extraction layers. The detector was an
integrating sphere with an ability to measure the intensity in the visible spectrum. The area under the intensity-
wavelength curve was integrated and compared for a qualitative comparison of light extraction efficiency.
Screening was also performed by fabricating large area green PHOLED (Figure 5) pixels (-0.6cm x 5cm)
on PPG's integrated float glass substrates. For confirmation of results large area white PHOLED pixels
were fabricated. A schematic of the white device is shown in Figure 9. Photographs of powered large
area green and white PHOLED devices fabricated for extraction enhancement measurements are shown in
Figure 10. The total emissive area for this design was 19.11 cm2 on a 35 cm2 substrate. Extraction
measurements were performed using a 20" integrating sphere at a constant device current density of
2mA/cm2 (corresponding to approx. 1000 nits). Optimized devices (by varying the HTL thickness) were
constructed on substrates with the light extraction layers and control substrates. Angular variation in color
with the angle of emission and spectral dependence were also studied for various LEL films.
Figure 9: A schematic of the white PHOLED device constructed on PPG's float-glass substrates.
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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/m1/10/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.