In a traditional flat OLED around 80% of the emitted light is trapped (and lost) inside the organic and substrate layers. Optical scattering greatly improves the efficiency of OLEDs. Setfos Light Scattering module is used to design scattering layers and OLEDs for efficiency and colour performance.

  • Simulation of scattering by structured surfaces or bulk particles
  • Simultaneous optimization of scatter layer and OLED stack
  • Combine multiple scattering layers in the device
  • External (substrate) and internal (inside the stack) scattering

Solar Cells


Light management layers are employed to enhance the absorption of thin film solar cells. Setfos Light Scattering enables fast design of the scattering layer and the thin film stack.

  • Optimize the scatter layer and thin film stack simultaneously
  • Design scattering surfaces and particle dispersions
  • Analyze absorption in the active layer and parasitic absorption per wavelength

Scattering Surfaces

Non-flat layers of micro- or nanosized features scatter light outside the specular directions both in relfection and transmission. This interface scattering can be applied externally (at the air interface) or internally in the layer stack. Setfos can treat the wide variety of structuring methods used throughout industry and academia

  • Import texture data from profile measurements (AFM)
  • Employ analytical scatter distribution functions to find the optimal BSDF
  • Import experimental BSDF data
  • New in Setfos 4.3 simulate microlenses and -textures via ray-tracing
  • Simulate using geometric (ray) or physical (wave) optics.

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Particle Scattering


Micro or nano particles dispersed in the bulk of a host material are an effective way of creating scattering layers. Setfos Mie scattering allows:

  • Spherical particles of any size
  • Optimize concentration and refractive index of particle layers
  • Simulate the effect of size distributions
  • Vary the host material and thickness
  • Combine stack and outcoupling layer design

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Many materials exhibit birefringent behaviour in both small molecule and polymer based organic electronic devices. Setfos calculates the effects of unixial anisotropiy in the thin film micro-cavity and the emitting material.

Quantum Dots

Quantum dot materials are used to expand the colour gamut in displays and convert light to lower wavelengths in solar cells. Setfos can simulate the interplay of the quantum dots with the optical environment. Setfos can:

  • Simulate mixtures of different species and concentrations of quantum dot including self-absorption
  • Combine quantum dots with scattering particles
  • Calculate the emission and absorption from thin film stacks containing quantum dot layers per angle. 

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