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Title: Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer

Abstract

A tetradentate Pd(II) complex, Pd3O3, which exhibits highly efficient excimer emission is synthesized and characterized. Pd3O3 can achieve blue emission despite using phenyl-pyridine emissive ligands which have been a mainstay of stable green and red phosphorescent emitter designs, making Pd3O3 a good candidate for stable blue or white OLEDs. Pd3O3 exhibits strong and efficient phosphorescent excimer emission expanding the excimer based white OLEDs beyond the sole class of Pt complexes. Devices of Pd3O3 demonstrate peak external quantum efficiencies as high as 24.2% and power efficiencies of 67.9 Lm per W for warm white devices. Furthermore, Pd3O3 devices in a carefully designed stable structure achieved a device operational lifetime of nearly 3000 h at 1000 cd m–2 without any outcoupling enhancement while simultaneously achieving peak external quantum efficiencies of 27.3% and power efficiencies over 81 Lm per W.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1]
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  1. Materials Science and Engineering, Arizona State University, Tempe, USA
Publication Date:
Research Org.:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1409481
Alternate Identifier(s):
OSTI ID: 1506453
Grant/Contract Number:  
EE0007090
Resource Type:
Published Article
Journal Name:
Chemical Science
Additional Journal Information:
Journal Name: Chemical Science Journal Volume: 8 Journal Issue: 12; Journal ID: ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Fleetham, Tyler, Ji, Yunlong, Huang, Liang, Fleetham, Trenten S., and Li, Jian. Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer. United Kingdom: N. p., 2017. Web. doi:10.1039/C7SC02512B.
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Fleetham, Tyler, Ji, Yunlong, Huang, Liang, Fleetham, Trenten S., & Li, Jian. Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer. United Kingdom. https://doi.org/10.1039/C7SC02512B
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Fleetham, Tyler, Ji, Yunlong, Huang, Liang, Fleetham, Trenten S., and Li, Jian. Sun . "Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer". United Kingdom. https://doi.org/10.1039/C7SC02512B.
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@article{osti_1409481,
title = {Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer},
author = {Fleetham, Tyler and Ji, Yunlong and Huang, Liang and Fleetham, Trenten S. and Li, Jian},
abstractNote = {A tetradentate Pd(II) complex, Pd3O3, which exhibits highly efficient excimer emission is synthesized and characterized. Pd3O3 can achieve blue emission despite using phenyl-pyridine emissive ligands which have been a mainstay of stable green and red phosphorescent emitter designs, making Pd3O3 a good candidate for stable blue or white OLEDs. Pd3O3 exhibits strong and efficient phosphorescent excimer emission expanding the excimer based white OLEDs beyond the sole class of Pt complexes. Devices of Pd3O3 demonstrate peak external quantum efficiencies as high as 24.2% and power efficiencies of 67.9 Lm per W for warm white devices. Furthermore, Pd3O3 devices in a carefully designed stable structure achieved a device operational lifetime of nearly 3000 h at 1000 cd m–2 without any outcoupling enhancement while simultaneously achieving peak external quantum efficiencies of 27.3% and power efficiencies over 81 Lm per W.},
doi = {10.1039/C7SC02512B},
journal = {Chemical Science},
number = 12,
volume = 8,
place = {United Kingdom},
year = {2017},
month = {1}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1039/C7SC02512B
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Cited by: 6 works
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Figures / Tables:

Fig. 1 Fig. 1: Photoluminescent spectra of Pd3O3, PtOO3, and fac-Ir(ppy)3 at 77 K in 2-methyl-THF and molecular structures of select tetradentate excimer emitters and phenyl-pyridine based emitters.
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