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A schematic diagram of an OLED on a luminaire is depicted. The clear acrylic luminaires are molded into the shape of a truncated square pyramid with various base angles .
The components of the complex refractive index of , NPD, BAlq, and CBP are plotted. Optical absorption from these layers becomes significant below , where absorption rises sharply. These components were measured using spectroscopic ellipsometry. The aluminum cathode reflectivity measured at is 85%.
A ray tracing model of the truncated square pyramid was used to determine the fraction of light that enters air (volumes 1 and 2) from a source centered at the base of the pyramid. The source is in the luminaire, and it is a hemisphere with a diameter of . Rays emanate isotropically from the curved face of the hemisphere into the luminaire and outcouple into volumes 1 and 2.
Based on ray tracing models, the total light outcoupled from the truncated square pyramid and the fraction of light outcoupled into volume 2, defined in Fig. 3, are plotted versus . The total outcoupled light is almost constant for , but the fraction of light outcoupled into volumes 1 and 2 varies significantly with . For , the total outcoupled light is 73.5% lower than the total outcoupled light when . This indicates that of the light is absorbed by the luminaire, which has an internal transmittance .
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