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Exciton distribution in white OLEDs (WOLEDs) with broad emission zones containing multiple material interfaces are difficult to accurately predict, making their optimal design accessible only through the fabrication and measurement of numerous iterations involving different materials and layer thicknesses. We present a comprehensive model that is suitable for predicting the exciton distribution in state-of-art WOLEDs. The model captures both charge and exciton dynamics and takes all structural components of complex WOLEDs into consideration, including more than three interface barriers and emission layers with multiple dopants. The model quantitatively reproduces the measured exciton profile and suggests a charge blocking layer reduces the intensity-dependent color shifts in WOLEDs. The emission of WOLEDs with and without blocking layers are measured, and matches the calculated exciton distribution.
Boning Qu,Haonan Zhao, andStephen R. Forrest
"Analysis of the charge and exciton distributions in white organic light emitting diodes with charge blocking layers", Proc. SPIE PC12418, Organic Photonic Materials and Devices XXV, PC1241805 (14 March 2023); https://doi.org/10.1117/12.2666396
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Boning Qu, Haonan Zhao, Stephen R. Forrest, "Analysis of the charge and exciton distributions in white organic light emitting diodes with charge blocking layers," Proc. SPIE PC12418, Organic Photonic Materials and Devices XXV, PC1241805 (14 March 2023); https://doi.org/10.1117/12.2666396