Light extraction from OLEDs using volumetric light scattering

Joseph Shiang; Tami Faircloth; Anil R. Duggal

doi:10.1117/12.505704

16 February 2004 Light extraction from OLEDs using volumetric light scattering

Joseph Shiang, Tami Faircloth, Anil R. Duggal

Proceedings Volume 5214, Organic Light-Emitting Materials and Devices VII; (2004) https://doi.org/10.1117/12.505704
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

One of the limitations on OLED performance is the optical extraction efficiency, η_ex, which is the ratio of light generated within the device to light emitted into the ambient. Ideally η_ex is equal to unity. Typical estimates for this efficiency factor in OLEDs range between 0.17-0.5. We present a simple radiative transport model that quantifies the effect of volumetric light scattering on light output in terms of a small set of readily measured parameters. Our methodology is sufficiently general to parameterize and describe many of the light extraction schemes found in the literature. We will present a set of model calculations using parameters typical of many OLEDs, and show that the introduction of light scattering sites within the otherwise transparent substrate can increase light extraction efficiencies by at least a factor of 1.4. We also present experimental data to validate our analysis and demonstrate a high level of agreement between model and experiment.

Citation Download Citation

Joseph Shiang, Tami Faircloth, and Anil R. Duggal "Light extraction from OLEDs using volumetric light scattering", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); https://doi.org/10.1117/12.505704

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