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Title: Highly Efficient Blue OLEDs Based on Metal‐Assisted Delayed Fluorescence Pd(II) Complexes

Abstract

Abstract A series of metal‐assisted delayed fluorescence (MADF) palladium(II) complexes, PdN1N, PdN1N‐dm, and PdN6N, are studied. Their 77 K photoluminescence emission spectra show a narrow primary emission peak at 464, 466, and 470 nm, respectively, with small vibronic peaks characteristic of many phosphorescent emitters. At room temperature (300 K), the dominant emission peaks for PdN1N, PdN1N‐dm, and PdN6N are slightly redshifted to 472, 470, and 476 nm, respectively. In the meantime, a broad sideband is also shown between 410 and 450 nm due to the MADF process. A blue device employing PdN1N‐dm demonstrates an electroluminescence emission peak at 476 nm and the maximum external quantum efficiency (EQE) of 25.1%. The high maximum EQE of the blue organic light‐emitting diode (OLED) device indicates that both the phosphorescence and the delayed fluorescence are very efficient. In addition, a stable OLED device of PdN1N‐dm gives a maximum EQE of 9.8% and the estimated operational lifetime LT 70 of 350 h at the practical luminance of 100 cd m −2 .

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
  1. Materials Science and Engineering Arizona State University 7700 South River Parkway Tempe AZ 85287 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1490110
Grant/Contract Number:  
EE0007090
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Advanced Optical Materials
Additional Journal Information:
Journal Name: Advanced Optical Materials Journal Volume: 7 Journal Issue: 6; Journal ID: ISSN 2195-1071
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Zhu, Zhi‐Qiang, Park, Choong‐Do, Klimes, Kody, and Li, Jian. Highly Efficient Blue OLEDs Based on Metal‐Assisted Delayed Fluorescence Pd(II) Complexes. Germany: N. p., 2019. Web. doi:10.1002/adom.201801518.
Zhu, Zhi‐Qiang, Park, Choong‐Do, Klimes, Kody, & Li, Jian. Highly Efficient Blue OLEDs Based on Metal‐Assisted Delayed Fluorescence Pd(II) Complexes. Germany. https://doi.org/10.1002/adom.201801518
Zhu, Zhi‐Qiang, Park, Choong‐Do, Klimes, Kody, and Li, Jian. 2019. "Highly Efficient Blue OLEDs Based on Metal‐Assisted Delayed Fluorescence Pd(II) Complexes". Germany. https://doi.org/10.1002/adom.201801518.
@article{osti_1490110,
title = {Highly Efficient Blue OLEDs Based on Metal‐Assisted Delayed Fluorescence Pd(II) Complexes},
author = {Zhu, Zhi‐Qiang and Park, Choong‐Do and Klimes, Kody and Li, Jian},
abstractNote = {Abstract A series of metal‐assisted delayed fluorescence (MADF) palladium(II) complexes, PdN1N, PdN1N‐dm, and PdN6N, are studied. Their 77 K photoluminescence emission spectra show a narrow primary emission peak at 464, 466, and 470 nm, respectively, with small vibronic peaks characteristic of many phosphorescent emitters. At room temperature (300 K), the dominant emission peaks for PdN1N, PdN1N‐dm, and PdN6N are slightly redshifted to 472, 470, and 476 nm, respectively. In the meantime, a broad sideband is also shown between 410 and 450 nm due to the MADF process. A blue device employing PdN1N‐dm demonstrates an electroluminescence emission peak at 476 nm and the maximum external quantum efficiency (EQE) of 25.1%. The high maximum EQE of the blue organic light‐emitting diode (OLED) device indicates that both the phosphorescence and the delayed fluorescence are very efficient. In addition, a stable OLED device of PdN1N‐dm gives a maximum EQE of 9.8% and the estimated operational lifetime LT 70 of 350 h at the practical luminance of 100 cd m −2 .},
doi = {10.1002/adom.201801518},
url = {https://www.osti.gov/biblio/1490110}, journal = {Advanced Optical Materials},
issn = {2195-1071},
number = 6,
volume = 7,
place = {Germany},
year = {Tue Jan 08 00:00:00 EST 2019},
month = {Tue Jan 08 00:00:00 EST 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1002/adom.201801518

Citation Metrics:
Cited by: 35 works
Citation information provided by
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Works referenced in this record:

Cyclometalated Platinum Complexes with Luminescent Quantum Yields Approaching 100%
journal, June 2013


Controlling Singlet-Triplet Energy Splitting for Deep-Blue Thermally Activated Delayed Fluorescence Emitters
journal, December 2016


Recent Progresses on Materials for Electrophosphorescent Organic Light-Emitting Devices
journal, October 2010


Efficient deep blue electrophosphorescent devices based on platinum(II) bis(n-methyl-imidazolyl)benzene chloride
journal, August 2012


Phosphorescent Pt(II) and Pd(II) Complexes for Efficient, High-Color-Quality, and Stable OLEDs
journal, November 2016


High efficiency pure blue thermally activated delayed fluorescence molecules having 10H-phenoxaborin and acridan units
journal, January 2015


Harvesting All Electrogenerated Excitons through Metal Assisted Delayed Fluorescent Materials
journal, March 2015


Highly Efficient and Stable Narrow-Band Phosphorescent Emitters for OLED Applications
journal, December 2014


Status of and prospects for organic electroluminescence
journal, December 1996


Exciplex-Forming Co-host for Organic Light-Emitting Diodes with Ultimate Efficiency
journal, May 2013


Bridging the Efficiency Gap: Fully Bridged Dinuclear Cu(I)-Complexes for Singlet Harvesting in High-Efficiency OLEDs
journal, March 2015


High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials
journal, August 2000


Highly efficient blue electroluminescence based on thermally activated delayed fluorescence
journal, December 2014


Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO-LUMO Separation by the Multiple Resonance Effect
journal, February 2016


Triplet Harvesting with 100% Efficiency by Way of Thermally Activated Delayed Fluorescence in Charge Transfer OLED Emitters
journal, May 2013


Low driving voltage characteristics of triphenylene derivatives as electron transport materials in organic light-emitting diodes
journal, January 2012


Excimer-Based White Phosphorescent Organic Light-Emitting Diodes with Nearly 100 % Internal Quantum Efficiency
journal, January 2007


Efficient and stable single-doped white OLEDs using a palladium-based phosphorescent excimer
journal, January 2017


Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence
journal, July 2013


Thermally Activated Delayed Fluorescence Materials Towards the Breakthrough of Organoelectronics
journal, September 2014


Blue Phosphorescent Zwitterionic Iridium(III) Complexes Featuring Weakly Coordinating nido -Carborane-Based Ligands
journal, November 2016


Physical mechanism responsible for the stretched exponential decay behavior of aging organic light-emitting diodes
journal, November 2005


Deep-Blue-Emitting Heteroleptic Iridium(III) Complexes Suited for Highly Efficient Phosphorescent OLEDs
journal, September 2012


The path to ubiquitous and low-cost organic electronic appliances on plastic
journal, April 2004


Saturated deep blue organic electrophosphorescence using a fluorine-free emitter
journal, December 2005


Light-emitting devices based on organometallic platinum complexes as emitters
journal, November 2011


Highly Efficient Blue-Emitting Cyclometalated Platinum(II) Complexes by Judicious Molecular Design
journal, May 2013


Facile Synthesis and Characterization of Phosphorescent Pt(N C N)X Complexes
journal, December 2010


New Molecular Design Concurrently Providing Superior Pure Blue, Thermally Activated Delayed Fluorescence and Optical Out-Coupling Efficiencies
journal, August 2017


Highly efficient organic light-emitting diodes from delayed fluorescence
journal, December 2012


Highly Efficient Luminescence of Cu(I) Compounds: Thermally Activated Delayed Fluorescence Combined with Short-Lived Phosphorescence
journal, January 2015


Organic electroluminescent diodes
journal, September 1987


Efficient “Pure” Blue OLEDs Employing Tetradentate Pt Complexes with a Narrow Spectral Bandwidth
journal, September 2014


Synthesis and Characterization of Phosphorescent Cyclometalated Platinum Complexes
journal, June 2002


Improved out-coupling efficiency from a green microcavity OLED with a narrow band emission source
journal, October 2016


Light-emitting diodes based on conjugated polymers
journal, October 1990


Efficient Red-Emitting Platinum Complex with Long Operational Stability
journal, July 2015


High efficiency and low roll-off blue phosphorescent organic light-emitting devices using mixed host architecture
journal, July 2010


Highly efficient phosphorescent emission from organic electroluminescent devices
journal, September 1998


Temperature Dependence of Blue Phosphorescent Cyclometalated Ir(III) Complexes
journal, July 2009


Synthesis and some reactions of hexaazatriphenylenehexanitrile, a hydrogen-free polyfunctional heterocycle with D3h symmetry
journal, December 1986


Design Strategy for 25% External Quantum Efficiency in Green and Blue Thermally Activated Delayed Fluorescent Devices
journal, August 2015