Title :
Simulating electronic and optical processes in multilayer organic light-emitting devices
Author :
Ruhstaller, Beat ; Beierlein, Tilman ; Riel, Heike ; Karg, Siegfried ; Scott, J. Campbell ; Riess, Walter
Author_Institution :
IBM Zurich Res. Lab., Ruschlikon, Switzerland
Abstract :
A detailed investigation of the device operation of a blue-emitting multilayer organic light-emitting device (OLED) using an electronic device model is presented. In particular, a transient electroluminescence overshoot at turn-on is found to originate from charge and recombination confinement effects at internal interfaces. The location of the emission zone is obtained from the electronic model and its experimental determination exemplified by a sensing layer method. Moreover, the optimization of emission intensity and color is discussed for a red-emitting OLED. The thin-film interference effects are analyzed with help of an optical device model.
Keywords :
charge injection; electroluminescence; excitons; organic light emitting diodes; organic semiconductors; semiconductor device models; bipolar charge injection; blue-emitting light-emitting device; charge confinement effects; device operation; drift-diffusion equations; electronic device model; emission intensity; emission zone location; exciton rate equations; internal interfaces; multilayer organic light-emitting device; optical device model; optical simulation; optimization; organic semiconductors; recombination confinement effects; red-emitting light-emitting devices; sensing layer method; thin-film interference effects; transfer matrix approach; transient electroluminescence overshoot; Charge carrier processes; Equations; Excitons; Nonhomogeneous media; Optical devices; Optical sensors; Organic light emitting diodes; Radiative recombination; Spontaneous emission; Stimulated emission;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2003.818852
