Efficient, Color-Stable, and Long-Lived White Organic Light-Emitting Diodes Utilizing Phosphorescent Molecular Aggregates

Lydia Ameri; Linyu Cao; Xinqiang Tan; Jian Li

doi:10.1002/adma.202208361

Efficient, Color-Stable, and Long-Lived White Organic Light-Emitting Diodes Utilizing Phosphorescent Molecular Aggregates

Adv Mater. 2023 Mar;35(11):e2208361. doi: 10.1002/adma.202208361. Epub 2023 Feb 6.

Authors

Lydia Ameri¹, Linyu Cao¹, Xinqiang Tan¹, Jian Li¹

Affiliation

¹ Materials Science and Engineering, Arizona State University, Tempe, AZ, 85287, USA.

PMID: 36599096
DOI: 10.1002/adma.202208361

Abstract

Highly efficient and stable single-stack hybrid white organic light-emitting diode (WOLED) devices are developed using two emissive layers: one with amber-colored phosphorescent molecular-aggregate emission from the Pd(II) complex, Pd(II) 7-(3-(pyridine-2-yl-κN)phenoxy-κC)(benzo-κC)([c]benzo[4,5]imidazo-κN)[1,2-a][1,5]naphthyridine, Pd3O8-Py5, and the other with blue fluorescence emission. An optimized device structure achieves high color stability under various current densities, an external quantum efficiency (EQE) of 45.5%, a power efficiency of 97.4 Lm W^-1 , and an estimated LT₉₅ (operational time to 95% of the initial luminance) of 50 744 h at an initial luminance of 1000 cd m^-2 .

Keywords: color stability; fluorescence; molecular aggregates; operational stability; phosphorescence; white OLEDs.

Abstract

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