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Title: Long term stable deep red light-emitting electrochemical cells based on an emissive, rigid cationic Ir(iii) complex

Abstract

Here, the new cationic iridium complex [Ir(bzq) 2(biq)][PF 6] (bzq = benzo[ h]quinolinato and biq = 2,2'-biquinoline) has been synthesized for application as an emitter in light emitting electrochemical cells (LECs). The molecular structure and crystal packing of this complex were established by single X-ray diffraction (SXRD). The electrochemical and photophysical properties of the complex were examined to determine the frontier orbital energies as well as the optical transitions that led to photoemission. The complex was found to emit at 644 nm and 662 nm for powder and thin films, respectively. A high powder photoluminescence quantum yield of 25% was determined, which is attributed to a reduction in vibrational modes of the complex due to the use of the rigid cyclometalated (C^N) bzq ligand. A LEC with [Ir(bzq) 2(biq)][PF 6] as the emitter was fabricated which showed a deep red emission (662 nm) with a luminance of 33.65 cd m –2, yielding a current efficiency of 0.33 cd A –1 and a power efficiency of 0.2 lm W –1. Most importantly, the LEC based on [Ir(bzq) 2(biq)][PF 6] demonstrated a lifetime of 280 hours which is among the longest device lifetimes reported for any deep red light emitting LEC.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5]
  1. OSRAM GmbH, Augsburg (Germany)
  2. (Germany)
  3. OSRAM OLED GmbH, Regensburg (Germany)
  4. Ruhr-Univ. Bochum, Bochum (Germany)
  5. (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1350070
Report Number(s):
IS-J-9086
Journal ID: ISSN 2050-7526; JMCCCX
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry C
Additional Journal Information:
Journal Volume: 5; Journal Issue: 12; Journal ID: ISSN 2050-7526
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Namanga, Jude E., Ruhr-Univ. Bochum, Bochum, Gerlitzki, Niels, Mallick, Bert, Mudring, Anja -Verena, and Iowa State Univ., Ames, IA. Long term stable deep red light-emitting electrochemical cells based on an emissive, rigid cationic Ir(iii) complex. United States: N. p., 2017. Web. doi:10.1039/C6TC04547B.
Namanga, Jude E., Ruhr-Univ. Bochum, Bochum, Gerlitzki, Niels, Mallick, Bert, Mudring, Anja -Verena, & Iowa State Univ., Ames, IA. Long term stable deep red light-emitting electrochemical cells based on an emissive, rigid cationic Ir(iii) complex. United States. doi:10.1039/C6TC04547B.
Namanga, Jude E., Ruhr-Univ. Bochum, Bochum, Gerlitzki, Niels, Mallick, Bert, Mudring, Anja -Verena, and Iowa State Univ., Ames, IA. Fri . "Long term stable deep red light-emitting electrochemical cells based on an emissive, rigid cationic Ir(iii) complex". United States. doi:10.1039/C6TC04547B. https://www.osti.gov/servlets/purl/1350070.
@article{osti_1350070,
title = {Long term stable deep red light-emitting electrochemical cells based on an emissive, rigid cationic Ir(iii) complex},
author = {Namanga, Jude E. and Ruhr-Univ. Bochum, Bochum and Gerlitzki, Niels and Mallick, Bert and Mudring, Anja -Verena and Iowa State Univ., Ames, IA},
abstractNote = {Here, the new cationic iridium complex [Ir(bzq)2(biq)][PF6] (bzq = benzo[h]quinolinato and biq = 2,2'-biquinoline) has been synthesized for application as an emitter in light emitting electrochemical cells (LECs). The molecular structure and crystal packing of this complex were established by single X-ray diffraction (SXRD). The electrochemical and photophysical properties of the complex were examined to determine the frontier orbital energies as well as the optical transitions that led to photoemission. The complex was found to emit at 644 nm and 662 nm for powder and thin films, respectively. A high powder photoluminescence quantum yield of 25% was determined, which is attributed to a reduction in vibrational modes of the complex due to the use of the rigid cyclometalated (C^N) bzq ligand. A LEC with [Ir(bzq)2(biq)][PF6] as the emitter was fabricated which showed a deep red emission (662 nm) with a luminance of 33.65 cd m–2, yielding a current efficiency of 0.33 cd A–1 and a power efficiency of 0.2 lm W–1. Most importantly, the LEC based on [Ir(bzq)2(biq)][PF6] demonstrated a lifetime of 280 hours which is among the longest device lifetimes reported for any deep red light emitting LEC.},
doi = {10.1039/C6TC04547B},
journal = {Journal of Materials Chemistry C},
number = 12,
volume = 5,
place = {United States},
year = {2017},
month = {2}
}

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Works referenced in this record:

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Long-Living Light-Emitting Electrochemical Cells - Control through Supramolecular Interactions
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    Works referencing / citing this record:

    Archetype Cationic Iridium Complexes and Their Use in Solid-State Light-Emitting Electrochemical Cells
    journal, November 2009

    • Costa, Rubén D.; Ortí, Enrique; Bolink, Henk J.
    • Advanced Functional Materials, Vol. 19, Issue 21
    • DOI: 10.1002/adfm.200900911

    Efficient and Long-Living Light-Emitting Electrochemical Cells
    journal, April 2010

    • Costa, Rubén D.; Ortí, Enrique; Bolink, Henk J.
    • Advanced Functional Materials, Vol. 20, Issue 9
    • DOI: 10.1002/adfm.201000043

    Operating Modes of Sandwiched Light-Emitting Electrochemical Cells
    journal, March 2011

    • Lenes, Martijn; Garcia-Belmonte, Germà; Tordera, Daniel
    • Advanced Functional Materials, Vol. 21, Issue 9
    • DOI: 10.1002/adfm.201002587

    Dynamic Doping in Planar Ionic Transition Metal Complex-Based Light-Emitting Electrochemical Cells
    journal, February 2013

    • Meier, Sebastian B.; van Reenen, Stephan; Lefevre, Bastien
    • Advanced Functional Materials, Vol. 23, Issue 28
    • DOI: 10.1002/adfm.201202689

    Long-Living Light-Emitting Electrochemical Cells - Control through Supramolecular Interactions
    journal, October 2008

    • Bolink, Henk J.; Coronado, Eugenio; Costa, Rubén D.
    • Advanced Materials, Vol. 20, Issue 20
    • DOI: 10.1002/adma.200801322

    Luminescent Ionic Transition-Metal Complexes for Light-Emitting Electrochemical Cells
    journal, August 2012

    • Costa, Rubén D.; Ortí, Enrique; Bolink, Henk J.
    • Angewandte Chemie International Edition, Vol. 51, Issue 33
    • DOI: 10.1002/anie.201201471

    Synthetically Tailored Excited States: Phosphorescent, Cyclometalated Iridium(III) Complexes and Their Applications
    journal, October 2006

    • Lowry, Michael S.; Bernhard, Stefan
    • Chemistry - A European Journal, Vol. 12, Issue 31
    • DOI: 10.1002/chem.200600618

    Spin-Orbit Coupling in Phosphorescent Iridium(III) Complexes
    journal, July 2011

    • Smith, Arthur R. G.; Burn, Paul L.; Powell, Ben J.
    • ChemPhysChem, Vol. 12, Issue 13
    • DOI: 10.1002/cphc.201100397

    A Comprehensive Survey of Cationic Iridium(III) Complexes Bearing Nontraditional Ligand Chelation Motifs
    journal, April 2013

    • Ladouceur, Sébastien; Zysman-Colman, Eli
    • European Journal of Inorganic Chemistry, Vol. 2013, Issue 17
    • DOI: 10.1002/ejic.201300171

    Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)
    journal, June 2016


    Efficient doped red light-emitting electrochemical cells based on cationic iridium complexes
    journal, January 2013


    Cationic Bis-cyclometalated Iridium(III) Diimine Complexes and Their Use in Efficient Blue, Green, and Red Electroluminescent Devices
    journal, November 2005

    • Tamayo, Arnold B.; Garon, Simona; Sajoto, Tissa
    • Inorganic Chemistry, Vol. 44, Issue 24
    • DOI: 10.1021/ic050970t

    Photophysical effects of metal-carbon .sigma. bonds in ortho-metalated complexes of iridium(III) and rhodium(III)
    journal, October 1984

    • Sprouse, S.; King, K. A.; Spellane, P. J.
    • Journal of the American Chemical Society, Vol. 106, Issue 22
    • DOI: 10.1021/ja00334a031

    Efficient Yellow Electroluminescence from a Single Layer of a Cyclometalated Iridium Complex
    journal, March 2004

    • Slinker, Jason D.; Gorodetsky, Alon A.; Lowry, Michael S.
    • Journal of the American Chemical Society, Vol. 126, Issue 9
    • DOI: 10.1021/ja0345221

    Solid-State White Light-Emitting Electrochemical Cells Using Iridium-Based Cationic Transition Metal Complexes
    journal, March 2008

    • Su, Hai-Ching; Chen, Hsiao-Fan; Fang, Fu-Chuan
    • Journal of the American Chemical Society, Vol. 130, Issue 11
    • DOI: 10.1021/ja076051e

    Polymer Light-Emitting Electrochemical Cells:  In Situ Formation of a Light-Emitting p−n Junction
    journal, January 1996

    • Pei, Qibing; Yang, Yang; Yu, Gang
    • Journal of the American Chemical Society, Vol. 118, Issue 16
    • DOI: 10.1021/ja953695q

    Correlating Experimental Photophysical Properties of Iridium(III) Complexes to Spin–Orbit Coupled TDDFT Predictions
    journal, November 2013

    • Younker, Jarod M.; Dobbs, Kerwin D.
    • The Journal of Physical Chemistry C, Vol. 117, Issue 48
    • DOI: 10.1021/jp410576a

    Tuning the Emission of Cationic Iridium (III) Complexes Towards the Red Through Methoxy Substitution of the Cyclometalating Ligand
    journal, July 2015

    • Hasan, Kamrul; Bansal, Ashu K.; Samuel, Ifor D. W.
    • Scientific Reports, Vol. 5, Issue 1
    • DOI: 10.1038/srep12325

    Red-light-emitting electrochemical cell using a polypyridyl iridium(iii) polymer
    journal, January 2009

    • Rodríguez-Redondo, José Lorenzo; Costa, Rubén D.; Ortí, Enrique
    • Dalton Transactions, Issue 44
    • DOI: 10.1039/b910105e

    Highly efficient double-doped solid-state white light-emitting electrochemical cells
    journal, January 2011

    • Su, Hai-Ching; Chen, Hsiao-Fan; Shen, Yu-Chun
    • Journal of Materials Chemistry, Vol. 21, Issue 26
    • DOI: 10.1039/c1jm10507h

    Dynamic doping and degradation in sandwich-type light-emitting electrochemical cells
    journal, January 2012

    • Meier, Sebastian B.; Hartmann, David; Tordera, Daniel
    • Physical Chemistry Chemical Physics, Vol. 14, Issue 31
    • DOI: 10.1039/c2cp41323j

    Solid-state light-emitting electrochemical cells based on ionic iridium(iii) complexes
    journal, January 2012

    • Hu, Tao; He, Lei; Duan, Lian
    • Journal of Materials Chemistry, Vol. 22, Issue 10
    • DOI: 10.1039/c2jm16185k

    Pulsed-current versus constant-voltage light-emitting electrochemical cells with trifluoromethyl-substituted cationic iridium(iii) complexes
    journal, January 2013

    • Shavaleev, Nail M.; Scopelliti, Rosario; Grätzel, Michael
    • Journal of Materials Chemistry C, Vol. 1, Issue 11
    • DOI: 10.1039/c3tc00808h

    Photophysical study of iridium complexes by absolute photoluminescence quantum yield measurements using an integrating sphere
    conference, August 2009

    • Suzuki, Kengo; Endo, Ayataka; Yoshihara, Toshitada
    • SPIE Photonic Devices + Applications, SPIE Proceedings
    • DOI: 10.1117/12.828463

    Polymer Light-Emitting Electrochemical Cells
    journal, August 1995


    Benzo[ h ]quinolin-10-yl- N Iridium(III) Complexes
    journal, March 1974

    • Nonoyama, Matsuo
    • Bulletin of the Chemical Society of Japan, Vol. 47, Issue 3
    • DOI: 10.1246/bcsj.47.767

    Phosphorescent Organic Light-Emitting Devices: Working Principle and Iridium Based Emitter Materials
    journal, August 2008

    • Kappaun, Stefan; Slugovc, Christian; List, Emil
    • International Journal of Molecular Sciences, Vol. 9, Issue 8
    • DOI: 10.3390/ijms9081527