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Title: Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs

Abstract

Phosphorescent organic light‐emitting diodes (OLEDs) are leading candidates for next‐generation displays and solid‐state lighting technologies. Much of the academic and commercial pursuits in phosphorescent OLEDs have been dominated by Ir(III) complexes. Over the past decade recent developments have enabled square planar Pt(II) and Pd(II) complexes to meet or exceed the performance of Ir complexes in many aspects. In particular, the development of N‐heterocyclic carbene‐based emitters and tetradentate cyclometalated Pt and Pd complexes have significantly improved the emission efficiency and reduced their radiative lifetimes making them competitive with the best reported Ir complexes. Furthermore, their unique and diverse molecular design possibilities have enabled exciting photophysical attributes including narrower emission spectra, excimer ‐based white emission, and thermally activated delayed fluorescence. These developments have enabled the fabrication of efficient and “pure” blue OLEDs, single‐doped white devices with EQEs of over 25% and high CRI, and device operational lifetimes which show early promise that square planar metal complexes can be stable enough for commercialization. These accomplishments have brought Pt complexes to the forefront of academic research. The molecular design strategies, photophysical characteristics, and device performance resulting from the major advancements in emissive Pt and Pd square planar complexes are discussed.

Authors:
 [1];  [1];  [1]
  1. Arizona State Univ., Tempe, AZ (United States). Material Science and Engineering
Publication Date:
Research Org.:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; National Science Foundation (NSF)
OSTI Identifier:
1533024
Alternate Identifier(s):
OSTI ID: 1401031
Grant/Contract Number:  
EE0005075; EE0007090; CHE-0748867
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 5; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; blue OLEDs; operational; platinum; stability palladium; white OLEDs

Citation Formats

Fleetham, Tyler, Li, Guijie, and Li, Jian. Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs. United States: N. p., 2016. Web. doi:10.1002/adma.201601861.
Fleetham, Tyler, Li, Guijie, & Li, Jian. Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs. United States. https://doi.org/10.1002/adma.201601861
Fleetham, Tyler, Li, Guijie, and Li, Jian. Fri . "Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs". United States. https://doi.org/10.1002/adma.201601861. https://www.osti.gov/servlets/purl/1533024.
@article{osti_1533024,
title = {Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs},
author = {Fleetham, Tyler and Li, Guijie and Li, Jian},
abstractNote = {Phosphorescent organic light‐emitting diodes (OLEDs) are leading candidates for next‐generation displays and solid‐state lighting technologies. Much of the academic and commercial pursuits in phosphorescent OLEDs have been dominated by Ir(III) complexes. Over the past decade recent developments have enabled square planar Pt(II) and Pd(II) complexes to meet or exceed the performance of Ir complexes in many aspects. In particular, the development of N‐heterocyclic carbene‐based emitters and tetradentate cyclometalated Pt and Pd complexes have significantly improved the emission efficiency and reduced their radiative lifetimes making them competitive with the best reported Ir complexes. Furthermore, their unique and diverse molecular design possibilities have enabled exciting photophysical attributes including narrower emission spectra, excimer ‐based white emission, and thermally activated delayed fluorescence. These developments have enabled the fabrication of efficient and “pure” blue OLEDs, single‐doped white devices with EQEs of over 25% and high CRI, and device operational lifetimes which show early promise that square planar metal complexes can be stable enough for commercialization. These accomplishments have brought Pt complexes to the forefront of academic research. The molecular design strategies, photophysical characteristics, and device performance resulting from the major advancements in emissive Pt and Pd square planar complexes are discussed.},
doi = {10.1002/adma.201601861},
journal = {Advanced Materials},
number = 5,
volume = 29,
place = {United States},
year = {Fri Nov 18 00:00:00 EST 2016},
month = {Fri Nov 18 00:00:00 EST 2016}
}

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Direct Base-Assisted C‒H Cyclonickelation of 6-Phenyl-2,2′-bipyridine
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Highly soluble fluorine containing Cu(i) AlkylPyrPhos TADF complexes
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Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs
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Direct Base-Assisted C‒H Cyclonickelation of 6-Phenyl-2,2′-bipyridine
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