Please enable JavaScript to view this site.

Application Gallery

Navigation: OLEDs > Patterned OLED > 3D OLED

3D OLED with no symmetry

Scroll Prev Top Next More

This section shows how a multi-layer 3D OLED with PC patterning can be simulated with FDTD using the methodology described in the 2D example The process is very similar to the 2D example from the previous section, and we will omit a lot of the detail here. Therefore, we highly recommend going through the following sections in detail before proceeding on to one of the 3D OLED examples

OLEDs

Simulation methodology

Simple 2D OLED

 

Even though the OLED structure in this example clearly has some symmetry, we will disregard this for now and treat this as an OLED structure with no symmetry. The files provided here are only intended to demonstrate this general approach, and should only be used when the actual OLED device has no symmetry! In the next section, we will describe how to take advantage of the lattice symmetry to reduce the number of simulations required.

 

Solvers

FDTD

Associated files

OLED_3D_simple.fsp

OLED_3D_sweepresults.lsf

OLED_3D_farfield.lsf

 

Note: The Parameter Sweep data is saved in OLED_3D_simple.fsp and ready for analysis

Related publications

H. Greiner and J. Pond, "Simulation of Light Extraction from OLEDS using FDTD", presented at NFO9, Lausanne, Switzerland, September 2006

 

M. Kitamura et al., "Enhanced Luminance Efficiency of Organic Light-Emitting Diodes with Two-Dimensional Photonic Crystals", Japanese Journal of Applied Physics, 44, 2844-2848, (2005)

 

Y.J. Lee et al., "A high-extraction-efficiency nanopatterned organic light-emitting diode´┐Ż", Applied Physics Letters, Vol.82, no.21, 3779-3781, 2003.

 

We gratefully acknowledge the collaboration of Horst Greiner of Philips Research and Dave Stegall of 3M in the development of this application example.

OLED_3Dview

 

Simulation setup

led_conventional_layers_zoom53

We will consider a structure similar to the one propose by Chutinan et al. Initially, we assume that all materials, except the cathode, are lossless dielectrics, but this can be easily changed. Also, we will start with a simulation span of only 8x8 um2 in the x and y plane. The simulation file OLED_simple.fsp contains a parametrized OLED structure. Please note that all the children of this structure are fully deleted each time a parameter is changed, so you should not add or remove objects from this group.

 

Here, we might want to consider 4x4 dipole locations across the unit cell (more may be required, but we have found this to work reasonably well).

 

oled_setup1_zoom25

 

For each dipole location, we need 3 simulations for the 3 dipole orientations (x/y/z). In principle, this means that we need 4x4x3=48 simulations (please see the next page for a discussion on how to reduce the total number of simulations). As in the simple 2D example, we use the parameter sweeping tool to automate the process of sweeping through the different dipole locations and orientations.

 

oled_3dsweep_zoom90

 

Note: to add more dipole locations, simply increase the "Number of points" in the pattern_dipole_position_x and pattern_dipole_position_y sweeps.

 

Radiative decay rate enhancement

The process of calculating the radiative decay rate is identical to the approach used in Simple 2D OLED. The script OLED_3D_sweepresults.lsf can be used to run the sweeps and obtain the results.

 

Extraction efficiency analysis

Even though the extraction efficiency analysis can be carried out with the parameter sweep project as shown in the simple 2D OLED example (ie. by averaging the far field projections for each dipole orientation/location). Here, we will carry out this analysis with a separate script OLED_3D_farfield.lsf.

 

Results and discussion

Please see Using symmetry to reduce the number of simulations and 3D OLED with square symmetry, where symmetry is applied and one can obtain reasonably similar results in a fraction of the time that it takes to run the 48 simulations required here.

Copyright Lumerical Inc. | Privacy | Site Map