# Quantum Efficiency of the OLED_3D_square example

#1

Hi,
The quantum efficiency is not actually calculated with the OLED_3D_square example. For quantum efficiency, one needs to know the total emitted power and radiative emitted power (like “fluorescence_decay.fsp”).
“OLED_internal_QE_analysis_3D_square.lsf” only deals with the total decay rate enhancement, and “OLED_total_QE_analysis_3D_square.lsf” only deals with the far field extraction efficiency.

I am wondering how to calculate the quantum efficiency in this case. Thanks!

How to simulate the quantum efficiency of a multilayer structure
#2

Dear @ANU

Thank you for reaching out and sorry for delayed response.

For Fluorescence Enhancement, the quantum efficiency is defined as ratio of radiative decay rate (gamma-rad) to dipole emission (gamma-rad + gamma-loss). In fluorescence_decay_analysis.lsf QE analysis group, this quantity is defined as T-structure / T-dipole where T-structure and T-dipole are the normalized transmission outside the sphere and normalized dipole emission or Purcell factor, respectively:

With the same analogy, if you want to calculate QE for OLED structure, you will need to calculate the ratio of total transmission (that is normalized to dipole power) outside the OLED structure to Purcell factor.