TITLE

100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films

AUTHOR(S)
Kawamura, Yuichiro; Goushi, Kenichi; Brooks, Jason; Brown, Julie J.; Sasabe, Hiroyuki; Adachi, Chihaya
PUB. DATE
February 2005
SOURCE
Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p071104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate that three Ir(III) complexes used as principal dopants in organic electrophosphorescent diodes have very high photoluminescence quantum efficiency (ηPL) in a solid-state film. The green emitting complex, fac-tris(2-phenylpyridinato)iridium(III) [Ir(ppy)3], the red-emitting bis[2-(2′-benzothienyl)pyridinato-N,C3′] (acetylacetonato)iridium(III) [Btp2Ir(acac)], and the blue complex bis[(4,6-difluorophenyl)pyridinato-N,C2](picolinato)iridium(III) (FIrpic) were prepared as codeposited films of varying concentration with 4,4′-bis(N-carbazolyl)-2,2′-biphenyl, a commonly used host material. The maximum ηPL values for Ir(ppy)3, Btp2Ir(acac), and FIrpic were, respectively, 97%±2% (at 1.5 mol%), 51%±1% (at 1.4 mol%), and 78%±1% (at 15 mol%). Furthermore, we also observed that the maximum ηPL of FIrpic reached 99%±1% when doped into the high triplet energy host, m-bis(N-carbazolyl)benzene, at an optimal concentration of 1.2 mol%.
ACCESSION #
16581287

 

Related Articles

  • Tunable diode laser spectroscopy of benzene near 1684 nm with a low-temperature VCSEL. Lytkine, A.; Lim, A.; Jäger, W.; Tulip, J. // Applied Physics B: Lasers & Optics;Jun2010, Vol. 99 Issue 4, p825 

    We describe the application of a long-wavelength vertical-cavity surface-emitting laser (VCSEL) with extended tuning range to the detection of benzene vapor at atmospheric pressure. A benzene absorption feature centered at 1684.24 nm was accessed by reducing the heat sink temperature of a VCSEL...

  • Highly efficient yellow and white organic electroluminescent devices doped with 2,8-di(t-butyl)-5,11-di[4-(t-butyl)phenyl]-6,12-diphenylnaphthacene. Tswen-Hsin Liu; Yao-Shan Wu; Meng-Ting Lee; Hsian-Hung Chen; Chi-Hung Liao; Chen, Chin H. // Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4304 

    We describe the applications of a sterically-hindered yellow dopant, 2,8-di(t-butyl)-5,11-di[4-(t-butyl)phenyl]-6,12-diphenylnaphthacene (TBRb) which, when compared to 5,6,11,12-tetraphenylnaphthacene (Rb) in either tris(8-hydroxyquinolinato)aluminum or...

  • Organic light-emitting diodes having exclusive near-infrared electrophosphorescence. Williams, Evan L.; Li, Jian; Jabbour, Ghassan E. // Applied Physics Letters;8/21/2006, Vol. 89 Issue 8, p083506 

    Near-infrared (NIR) emission is demonstrated from phosphorescent organic light-emitting diodes containing blends of polymeric host and heavy metal complex, iridium(III) bis(1-pyrenyl-isoquinolinato-N,C′) acetylacetonate. The devices exhibit exclusive NIR emission with a peak value at 720...

  • Catalytic dehydroaromatization of n-alkanes by pincer-ligated iridium complexes. Ahuja, Ritu; Punji, Benudhar; Findlater, Michael; Supplee, Carolyn; Schinski, William; Brookhart, Maurice; Goldman, Alan S. // Nature Chemistry;Feb2011, Vol. 3 Issue 2, p167 

    Aromatic hydrocarbons are among the most important building blocks in the chemical industry. Benzene, toluene and xylenes are obtained from the high temperature thermolysis of alkanes. Higher alkylaromatics are generally derived from arene-olefin coupling, which gives branched products-that is,...

  • Microwave-assisted, Ir-catalyzed aromatic C-H borylation. Zeqing, Li; Zhibin, Liang; Yuqiang, Wang; Pei, Yu // Research on Chemical Intermediates;Apr2013, Vol. 39 Issue 4, p1917 

    One-step conversions of 1,3-disubstituted benzenes to aryl boronates and 2,6-disubstituted pyridines to heteroaryl boronates are described. Microwave heating was used for all reactions. [(COD)Ir(μ-OMe)] and 4,4′-di- tert-butyl-2,2′-bipyridine were used as catalysts, in methyl...

  • Aromatics in Asia on downtrend.  // Chemical Business;Feb2010, Vol. 24 Issue 2, p76 

    The article reports on a downtrend in the aromatics market in Asia, including the benzene and toluene markets.

  • World benzene market tumbles. Gibson, Jane // European Chemical News;12/20/2004, Vol. 81 Issue 2128, p10 

    Reports on the prices of benzene in Europe as of December 2004. Decline in benzene spot prices per tonne; Possible reason behind the collapse of the benzene market around the world; Expectation on benzene supply in 2005.

  • C6H6.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p415 

    An encyclopedia entry for the chemical compound "C6H6," which refers to benzene, is presented.

  • benzol.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p256 

    A definition of the term "benzol" is presented.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics