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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:
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. Tue . "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},
journal = {Advanced Optical Materials},
number = 6,
volume = 7,
place = {Germany},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/adom.201801518

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Cited by: 35 works
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Works referenced in this record:

Wide-Energy-Gap Electron-Transport Materials Containing 3,5-Dipyridylphenyl Moieties for an Ultra High Efficiency Blue Organic Light-Emitting Device
journal, October 2008

  • Sasabe, Hisahiro; Gonmori, Eisuke; Chiba, Takayuki
  • Chemistry of Materials, Vol. 20, Issue 19
  • DOI: 10.1021/cm801727d

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

  • Turner, Eric; Bakken, Nathan; Li, Jian
  • Inorganic Chemistry, Vol. 52, Issue 13
  • DOI: 10.1021/ic302490c

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

  • Cui, Lin-Song; Nomura, Hiroko; Geng, Yan
  • Angewandte Chemie International Edition, Vol. 56, Issue 6
  • DOI: 10.1002/anie.201609459

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

  • Xiao, Lixin; Chen, Zhijian; Qu, Bo
  • Advanced Materials, Vol. 23, Issue 8, p. 926-952
  • DOI: 10.1002/adma.201003128

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

  • Numata, Masaki; Yasuda, Takuma; Adachi, Chihaya
  • Chemical Communications, Vol. 51, Issue 46
  • DOI: 10.1039/C5CC00307E

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

  • Zhu, Zhi-Qiang; Fleetham, Tyler; Turner, Eric
  • Advanced Materials, Vol. 27, Issue 15
  • DOI: 10.1002/adma.201401772

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

  • Li, Guijie; Fleetham, Tyler; Turner, Eric
  • Advanced Optical Materials, Vol. 3, Issue 3
  • DOI: 10.1002/adom.201400341

Status of and prospects for organic electroluminescence
journal, December 1996

  • Rothberg, Lewis J.; Lovinger, Andrew J.
  • Journal of Materials Research, Vol. 11, Issue 12
  • DOI: 10.1557/JMR.1996.0403

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

  • Park, Young-Seo; Lee, Sunghun; Kim, Kwon-Hyeon
  • Advanced Functional Materials, Vol. 23, Issue 39
  • DOI: 10.1002/adfm.201300547

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

  • Volz, Daniel; Chen, Ying; Wallesch, Manuela
  • Advanced Materials, Vol. 27, Issue 15
  • DOI: 10.1002/adma.201405897

Effect of the molecular structure of the host materials on the lifetime of green thermally activated delayed fluorescent organic light-emitting diodes
journal, January 2015

  • Im, Yirang; Song, Wook; Lee, Jun Yeob
  • Journal of Materials Chemistry C, Vol. 3, Issue 31
  • DOI: 10.1039/C5TC01065A

Strongly Phosphorescent Palladium(II) Complexes of Tetradentate Ligands with Mixed Oxygen, Carbon, and Nitrogen Donor Atoms: Photophysics, Photochemistry, and Applications
journal, September 2013

  • Chow, Pui Keong; Ma, Chensheng; To, Wai-Pong
  • Angewandte Chemie International Edition, Vol. 52, Issue 45
  • DOI: 10.1002/anie.201305590

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

  • Adachi, Chihaya; Baldo, Marc A.; Forrest, Stephen R.
  • Applied Physics Letters, Vol. 77, Issue 6
  • DOI: 10.1063/1.1306639

Highly Luminescent Tetradentate Bis-Cyclometalated Platinum Complexes: Design, Synthesis, Structure, Photophysics, and Electroluminescence Application
journal, June 2010

  • Vezzu, Dileep A. K.; Deaton, Joseph C.; Jones, James S.
  • Inorganic Chemistry, Vol. 49, Issue 11
  • DOI: 10.1021/ic1002226

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

  • Hirata, Shuzo; Sakai, Yumi; Masui, Kensuke
  • Nature Materials, Vol. 14, Issue 3
  • DOI: 10.1038/nmat4154

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

  • Hatakeyama, Takuji; Shiren, Kazushi; Nakajima, Kiichi
  • Advanced Materials, Vol. 28, Issue 14
  • DOI: 10.1002/adma.201505491

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

  • Dias, Fernando B.; Bourdakos, Konstantinos N.; Jankus, Vygintas
  • Advanced Materials, Vol. 25, Issue 27
  • DOI: 10.1002/adma.201300753

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

  • Togashi, Kazunori; Nomura, Shintaro; Yokoyama, Norimasa
  • Journal of Materials Chemistry, Vol. 22, Issue 38
  • DOI: 10.1039/c2jm33669c

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

  • Fleetham, Tyler; Ji, Yunlong; Huang, Liang
  • Chemical Science, Vol. 8, Issue 12
  • DOI: 10.1039/C7SC02512B

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

  • Nakanotani, Hajime; Masui, Kensuke; Nishide, Junichi
  • Scientific Reports, Vol. 3, Issue 1
  • DOI: 10.1038/srep02127

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

  • Axtell, Jonathan C.; Kirlikovali, Kent O.; Djurovich, Peter I.
  • Journal of the American Chemical Society, Vol. 138, Issue 48
  • DOI: 10.1021/jacs.6b10232

Highly luminescent palladium( ii ) complexes with sub-millisecond blue to green phosphorescent excited states. Photocatalysis and highly efficient PSF-OLEDs
journal, January 2016

  • Chow, Pui-Keong; Cheng, Gang; Tong, Glenna So Ming
  • Chemical Science, Vol. 7, Issue 9
  • DOI: 10.1039/C6SC00462H

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

  • Féry, C.; Racine, B.; Vaufrey, D.
  • Applied Physics Letters, Vol. 87, Issue 21
  • DOI: 10.1063/1.2133922

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

  • Yang, Cheng-Han; Mauro, Matteo; Polo, Federico
  • Chemistry of Materials, Vol. 24, Issue 19
  • DOI: 10.1021/cm3010453

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

  • Holmes, R. J.; Forrest, S. R.; Sajoto, T.
  • Applied Physics Letters, Vol. 87, Issue 24
  • DOI: 10.1063/1.2143128

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

  • Kalinowski, Jan; Fattori, Valeria; Cocchi, Massimo
  • Coordination Chemistry Reviews, Vol. 255, Issue 21-22
  • DOI: 10.1016/j.ccr.2011.01.049

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

  • Hang, Xiao-Chun; Fleetham, Tyler; Turner, Eric
  • Angewandte Chemie International Edition, Vol. 52, Issue 26, p. 6753-6756
  • DOI: 10.1002/anie.201302541

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

  • Wang, Zixing; Turner, Eric; Mahoney, Vanessa
  • Inorganic Chemistry, Vol. 49, Issue 24
  • DOI: 10.1021/ic100740e

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

  • Rajamalli, P.; Senthilkumar, N.; Huang, P. -Y.
  • Journal of the American Chemical Society, Vol. 139, Issue 32
  • DOI: 10.1021/jacs.7b03848

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

  • Uoyama, Hiroki; Goushi, Kenichi; Shizu, Katsuyuki
  • Nature, Vol. 492, Issue 7428
  • DOI: 10.1038/nature11687

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

  • Hofbeck, Thomas; Monkowius, Uwe; Yersin, Hartmut
  • Journal of the American Chemical Society, Vol. 137, Issue 1
  • DOI: 10.1021/ja5109672

Organic electroluminescent diodes
journal, September 1987

  • Tang, C. W.; VanSlyke, S. A.
  • Applied Physics Letters, Vol. 51, Issue 12
  • DOI: 10.1063/1.98799

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

  • Fleetham, Tyler; Li, Guijie; Wen, Lele
  • Advanced Materials, Vol. 26, Issue 41, p. 7116-7121
  • DOI: 10.1002/adma.201401759

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

  • Brooks, Jason; Babayan, Yelizaveta; Lamansky, Sergey
  • Inorganic Chemistry, Vol. 41, Issue 12
  • DOI: 10.1021/ic0255508

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

  • Burroughes, J. H.; Bradley, D. D. C.; Brown, A. R.
  • Nature, Vol. 347, Issue 6293
  • DOI: 10.1038/347539a0

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

  • Fleetham, Tyler; Li, Guijie; Li, Jian
  • ACS Applied Materials & Interfaces, Vol. 7, Issue 30
  • DOI: 10.1021/acsami.5b01596

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

  • Chopra, Neetu; Swensen, James S.; Polikarpov, Evgueni
  • Applied Physics Letters, Vol. 97, Issue 3
  • DOI: 10.1063/1.3464969

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

  • Baldo, M. A.; O'Brien, D. F.; You, Y.
  • Nature, Vol. 395, Issue 6698, p. 151-154
  • DOI: 10.1038/25954

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

  • Sajoto, Tissa; Djurovich, Peter I.; Tamayo, Arnold B.
  • Journal of the American Chemical Society, Vol. 131, Issue 28
  • DOI: 10.1021/ja903317w

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

  • Kanakarajan, K.; Czarnik, Anthony W.
  • The Journal of Organic Chemistry, Vol. 51, Issue 26
  • DOI: 10.1021/jo00376a036

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

  • Lee, Dong Ryun; Kim, Mounggon; Jeon, Sang Kyu
  • Advanced Materials, Vol. 27, Issue 39
  • DOI: 10.1002/adma.201502053