Analysis of the charge and exciton distributions in white organic light emitting diodes with charge blocking layers

Boning Qu; Haonan Zhao; Stephen R. Forrest

doi:10.1117/12.2666396

14 March 2023 Analysis of the charge and exciton distributions in white organic light emitting diodes with charge blocking layers

Boning Qu, Haonan Zhao, Stephen R. Forrest

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Proceedings Volume PC12418, Organic Photonic Materials and Devices XXV; PC1241805 (2023) https://doi.org/10.1117/12.2666396
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

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.

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Boning Qu, Haonan Zhao, and 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

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KEYWORDS

Excitons

Organic light emitting diodes

Interfaces

Design and modelling

Diffusion

Dopants

Electrons

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