Efficient and Stable Molecular‐Aggregate‐Based Organic Light‐Emitting Diodes with Judicious Ligand Design

Cao, Linyu; Zhu, Zhi‐Qiang; Klimes, Kody; Li, Jian

doi:10.1002/adma.202101423

Efficient and Stable Molecular‐Aggregate‐Based Organic Light‐Emitting Diodes with Judicious Ligand Design

Journal Article · Sat Jul 10 00:00:00 EDT 2021 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202101423· OSTI ID:1807598

Cao, Linyu ^[1]; Zhu, Zhi‐Qiang ^[1]; Klimes, Kody ^[1]; ^[1]

Department of Materials Science and Engineering Arizona State University Tempe AZ 85287 USA

Abstract

Phosphorescent molecular aggregates show promise in realizing efficient and stable organic light‐emitting diodes (OLEDs) operating at high brightness level, which is highly desired for future lighting and display applications. Herein, four tetradentate Pd(II) complexes are prepared with judicious ligand design, and their electrochemical and photophysical properties are thoroughly examined. The studies indicate that slight structural changes of ligands can modify the hole and electron transporting capabilities, and alter the horizontal emitting dipole ratios of aggregates in amorphous film, the latter of which are sensitive to the thin‐film deposition conditions including the deposition rate and the choice of the templating layer. An optimized OLED device using Pd3O8‐Py5 aggregates exhibits a peak external quantum efficiency (EQE) of 37.3% and a reduced efficiency roll‐off with high EQEs of 36.0% and 32.5% at 1000 and 10 000 cd m ⁻² , respectively. Moreover, such an efficient device demonstrates a long measured LT ₉₅ (time to 95% of the initial luminance) lifetime of over 500 h with an initial brightness of 17 304 cd m ⁻² corresponding to an estimated LT ₉₅ lifetime of 48 246 h at 1000 cd m ⁻² .

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0008721

OSTI ID:: 1807598

Alternate ID(s):: OSTI ID: 1848867

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 33 Vol. 33; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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