Bumblebee is our state-of-the-art kinetic Monte Carlo simulation code, optimized for molecular-scale simulations of opto-electronic processes in disordered systems, such as OLEDs, OPV and OFETs.

The intuitive web interface of Bumblebee allows you to quickly prepare and specify your virtual experiment and start dozens of device or material simulations on your laptop in your own private cloud.

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Advanced Simulations

Bumblebee allows one to simulate the interplay between all electronic and excitonic processes in OLEDs, OPV and OFETs, at the molecular scale, in all three dimensions, and from the nanosecond timescale to the full device lifetime. The simulations predict the electrical characteristics, efficiency, color point and lifetime of devices, based on physically meaningful material parameters, which may be obtained either from a few dedicated experiments or from quantum chemistry. The performance of any combination of materials and stack architectures, under a wide range of operational conditions, can be predicted.

Material evaluation

Bumblebee allows you to predict the electrical characteristics, efficiency, color point and lifetime of devices based on material parameters obtained from a few dedicated experiments or from quantum chemistry. By building a database of materials, the performance of any combination of these materials can be predicted.

Research excellence

Bumblebee is already intensively used both in an academic environment to perform cutting-edge research, as well as in industry to more efficiently develop state-of-the-art OLED stacks and solve real-life problems. There are many other areas of application within which bumblebee can be used, including organic photovoltaics (OPV) and organic field-effect transistors (OFET).

Full 3-D device model

Bumblebee is the first on the market to offer 3D molecular-scale mechanistic device modelling for organic devices. The unique mechanistic approach to device modelling provided by bumblebee allows one to analyze, predict and improve the performance of your devices, not only for today’s stack architectures but also for tomorrow’s.

Our Powerful Features

Organic light-emitting diodes (OLED)

Organic photovoltaics (OPV) and photodetectors (OPD)

Organic field effect transistors (OFET)

Electrical device and material modeling

Excitonic device and material modeling

Degradation and lifetime studies

Intuitive web interface


Integrated post-processing

No installation needed

  • Effects of disorder and traps
  • Non-uniform currents
  • Mixed-matrix emissive layer
  • Any 3D structure possible, including
    • graded concentration profiles
    • laterally non-uniform structures
    • rough, intermixed interfaces
  • Charge accumulation near interfaces
  • Charge carrier loss due to imperfect blocking
  • Voltage loss across transport layers
  • Dark-injection studies

  • Roll-off due to polaron quenching and exciton annihilation
  • Shape of the recombination zone
  • Color-tuning using co-doping
  • Delayed fluorescence, TADF, and hyperfluorescence
  • Transient electroluminescence
  • Consequences of degradation processes to device performance

  • Mobility studies, including
    • anisotropy
    • molecular doping
    • any shape of the density of states
    • any type of energetic correlation
    • any type of the positional disorder
  • Recombination rate studies
  • Exciton diffusion and energy transfer studies
  • Photoluminescence studies:
    • steady-state
    • time-resolved
    • polaron-singlet and polaron-triplet quenching
    • exciton-exciton annihilation (for singlets and triplets)
    • effect of emissive dipole orientation
  • Photobleaching studies

  • Visualization of current density filaments
  • Visualization of events
    • charge and exciton movement
    • exciton generation and dissociation
    • exciton quenching
    • degradation
  • Fully interactive
    • move through your device
    • take snapshots
    • save as movie

The intuitive interface of Bumblebee guides you through the complete simulation workflow, from preparing your simulations to the post-processing, all from your web browser.

  • Data security is our priority
  • Integrated post-processing features to help you visualize your results immediately and choose which data to extract.
  • All graphs and data can be saved on your computer and further processed on your chosen system.

  • Kinetic Monte Carlo simulation
  • Mechanistic approach based on physical parameters
  • Highly optimized code base written in C++
    • scalable: >107 molecules is feasible and realistic
    • simulations with >104 charge carriers and excitons are possible
  • Integrated post-processing

Wondering if Bumblebee can answer your research questions? Here you can find example application notes for diverse topics.

  • Thermally Activated Delayed Fluorescence in OLEDs
  • State-of-the-art 3.5th generation OLEDs
  • Transient electroluminescence in OLEDs
  • Modeling Organic Photovoltaic devices

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  • Recent browser with HTML5 support

Publications using Bumblebee


The ultimate tool for OLED stack development