Modeling the Charge and Exciton Distributions in Phosphorescent White Organic Light-Emitting Diodes

Qu, Boning; Zhao, Haonan; Forrest, Stephen R.

doi:10.1021/acsphotonics.3c00271

Modeling the Charge and Exciton Distributions in Phosphorescent White Organic Light-Emitting Diodes

Journal Article · Fri Aug 11 00:00:00 EDT 2023 · ACS Photonics

DOI:https://doi.org/10.1021/acsphotonics.3c00271· OSTI ID:1993006

Qu, Boning ^[1]; Zhao, Haonan ^[2]; ^[2]

Univ. of Michigan, Ann Arbor, MI (United States); University of Michigan
Univ. of Michigan, Ann Arbor, MI (United States)

A comprehensive numerical model is developed to quantitatively analyze the charge and exciton distributions in phosphorescent white organic light emitting diodes (WOLEDs). The model encompasses bipolar charge drift-diffusion transport with doping-dependent charge mobilities, field-dependent charge hopping across multiple interfaces, exciton generation, diffusion, energy transfer, radiative decay, and non-radiative exciton annihilation. The model is validated by direct measurement of the exciton distribution in monochromatic phosphorescent OLEDs. It is then applied to complex, multilayer WOLEDs where it is used to accurately predict their intensity and current-dependent spectral shifts. The magnitudes of different exciton loss channels in WOLEDs are calculated and quantitatively compared. This model provides an alternative for the many experimental iterations commonly used to optimize the color balance of complex OLEDs. In this context, the model inspired the addition of a hole blocking layer in the WOLED to balance the charge conduction and reduce spectral shifts – a design that is verified by experiment.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008723

OSTI ID:: 1993006

Journal Information:: ACS Photonics, Journal Name: ACS Photonics Journal Issue: 9 Vol. 10; ISSN 2330-4022

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Diodes
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phosphorescent

Modeling the Charge and Exciton Distributions in Phosphorescent White Organic Light-Emitting Diodes

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