Light Emission Simulation

Internal External Flat.png

Setfos calculates the light emitted in OLEDs using the dipole emission model. Setfos has been used and validated in several scientific publications. OLEDs can be simulated with all of these features:

  • Electroluminescence emission pattern with dipole emission model
  • Simulate micro-cavity effects  within seconds by thin film optics
  • Exciton processes can be modelled by coupling to electrical simulations.
  • Easily analyze the photo-physical properties of the OLED such as efficiency, angular colour and brightness change.
  • Complete set of optical physics: waveguided and plasmonic modes, quenching, emitter distribution and orientation.

 

scroll top

Efficiency and Emitted Colour

Setfos calculates the optical performance parameters of different devices taking into account the full micro-cavity behaviour including:

  • CIE xy colour coordinates, 
  • Brightness (cd/m2),
  • Luminous Efficacy (Lm/W),
  • Luminous Current Efficiency (lm/A),
  • Correlated Colour Temperature (CCT),
  • Colour Rendering Index (CRI),
  • Reflectance, transmittance and absorbance

Setfos graphical user interface presents the device design and simulation result in intuitive plots.

 

Mode Analysis

Simulation of waveguided modes across the visible spectrum

Simulation of waveguided modes across the visible spectrum

Setfos Mode Analysis can analyze in detail the light emission channels. In an OLED light is emitted into different channels which are either escaping to the far-field or waveguided inside the OLED layers. Without outcoupling structures, only the the light emitted inside the escape cone is visible to the end-user.
Mode analysis simulation calculates the contribution of the diffrent optical modes to the total emitted power:

  • Air modes escaping to the outside world
  • Substrate modes waveguided in a carrier substrate
  • Organic modes waveguided in the organic semiconductor stack
  • Plasmon modes coupled to the metal electrodes
  • Non-radiative quenching losses

Modes can be inspected across the spectrum or summarized taking into account the spectral distribution of the emitter.

Detailed analysis of optical emssion channels

Coatings, Filters & Thin Film Optics

Simulation of A white oled stack with colour filter

Simulation of A white oled stack with colour filter

Cavity and thin film design are the cornerstone of OLED optical design. The optical design is not limited to the (around 100nm) stack of organic semiconductor layers but also to colour filters and anti-reflection layers that are placed in the light path to achieve top class display & lighting performance.

Setfos calculates the colour, angular variation and polarization of the whole OLED stack including coherent optics in the microcavity and coatings incoherently coupled through the substrate.

Advanced Fitting: Emitter Profile, Optical Indices, Dipole Orientation

Powerful fitting algorithms let you extract material parameters from measurement data. The optimization routines find the optimal combination of many variables.

For example:

Fitted refractive indices of an organic solar cell material

Fitted refractive indices of an organic solar cell material

  • Determine the optical n & k values from reflectance and transmittance measurement using: Sellmeier, Tauc-Lorentz or Cauchy model.
  • Use spectral measurements to determine the intrinsic spectrum of an emitter/host system.
  • Find the spatial distribution of emitting molecules.
  • Determine the orientation of the emitter dipole by polarized spectroscopy or angular measurement.
  • Fit the mobility parameters from IV measurements

scroll top

 

More about

Drift-Diffusion

Drift-Diffusion

Absorption

Absorption

Light Scattering

Light Scattering