Organic light-emitting diodes have been successfully commercialized for display applications. However, efficiency remains a roadblock to lighting applications, the largest contribution to loss failure to extract emitted light due to waveguiding in the device and substrate. This reduces overall external quantum efficiencies to less than ~ 25%. For waveguiding in the device, which is the larger effect, one of the primary strategies to improve light extraction is the incorporation of scattering layers into the device architecture and implementations with TiO2 nanoparticles embedded in a silica matrix have nearly doubled the outcoupling of light [1]. Here, we will discuss the construction and application of nanotextured silver scattering layers as an alternative with the idea that the very high scattering cross-sections for silver nanoparticles are advantageous in that less recycling of light into the lossy regions of the device is needed. We will present modeling that supports this hypothesis and describe approaches to implementing suitable silver scattering layers and integrating them with organic LEDs. The extraction efficiency, spectrum and angular distribution of extracted light will be documented and compared with control devices containing no scattering layer. [1] H.-W. Chang etal., “Organic light-emitting devices integrated with internal scattering layers for enhancing optical out-coupling”, Jnl. of the Society for Information Display 2011, 19/2, 196-204.

Light extraction from organic light-emitting diodes using plasmonic scattering layers

249th National Meeting (2015)

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Light extraction from organic light-emitting diodes using plasmonic scattering layers<br />