Patent ID: 7801716

Claim:
A computer-implemented method for determining an indication of an organic light emitting diode (OLED) device performance based upon a computerized model, the OLED device including an OLED stack having active layers between an encapsulant and an electrode and having an encapsulant-air interface on a side opposite the electrode, the method comprising: receiving input values of parameters relating to an operation or a characterization of the OLED device, the parameters including a structure of the active layers, an index of refraction of the active layers, an orientation and depth of dipoles in the active layers, and an index of refraction of the encapsulant; processing the input values according to a computerized model in order to determine an efficiency of the OLED device and an angular distribution of emission into air at the encapsulant-air interface, the processing comprising: determining an actual emission of the OLED stack into the encapsulant as an exact solution of Maxwell's equations for electric dipole sources within a coherent layered medium; determining a power consumed to create the emission as an exact evaluation of Poynting's integral for oscillating electric dipoles within the coherent layered medium; determining an efficiency of the emission of the OLED stack into the encapsulant by calculating the emission divided by the power consumed; and determining an efficiency of an emission of the OLED stack into air as a matrix solution of the Radiative Transfer Equation within the encapsulant given the efficiency of the emission into the encapsulant and a bidirectional scattering distribution function of the encapsulant-air interface; and outputting values providing a prediction of the efficiency of the emission from the device into air and an angular distribution of the emission into air based upon results of the processing step.