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Low Molecular Weight Materials: Electron-Transport Materials

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Handbook of Organic Light-Emitting Diodes

Abstract

Since the first report of practical OLED by Tang and VanSlyke in 1987, metal complex, 8-hydroxyquinoline aluminum (Alq) is widely used for fluorescent OLEDs. However, Alq cannot be used in second- and third-generation green and blue OLEDs due to its low triplet energy (ET) of 2.15 eV. Therefore, researchers have been exploring a novel ETM with high ET in this decade. In this chapter, we summarized and demonstrated representative wide-energy-gap ETMs for use in second- and third-generation OLEDs, and some typical strategies for high-performance ETMs are demonstrated. Further, future challenges are briefly discussed.

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References

  • Aizawa N, Pu YJ, Watanabe M, Chiba T, Ideta K, Toyota N, Igarashi M, Suzuri Y, Sasabe H, Kido J (2014) Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission. Nat Commun 5:5756

    Article  Google Scholar 

  • Chen D, Su S-J, Cao Y (2014) Nitrogen heterocycle-containing materials for highly efficient phosphorescent OLEDs with low operating voltage. J Mater Chem C 2:9565–9578

    Article  ADS  Google Scholar 

  • Hughes G, Bryce MR (2005) Electron-transporting materials for organic electroluminescent and electrophosphorescent devices. J Mater Chem 15:94–107

    Article  Google Scholar 

  • Hung WY, Fang GC, Lin SW, Cheng SH, Wong KT, Kuo TY, Chou PT (2014) The first tandem, all-exciplex-based WOLED. Sci Rep 4:5161

    Article  Google Scholar 

  • Ichikawa M, Kawaguchi T, Kobayashi K, Miki T, Furukawa K, Koyama T, Taniguchi Y (2006) Bipyridyl oxadiazoles as efficient and durable electron-transporting and hole-blocking molecular materials. J Mater Chem 16:221–225

    Article  Google Scholar 

  • Ichikawa M, Hiramatsu N, Yokoyama N, Miki T, Narita S, Koyama T, Taniguchi Y (2007) Electron transport with mobility above 10–3 cm2/Vs in amorphous film of co-planar bipyridyl-substituted oxadiazole. Phys Status Solidi (RRL) Rapid Res Lett 1:R37–R39

    Article  ADS  Google Scholar 

  • Ichikawa M, Yamamoto T, Jeon H-G, Kase K, Hayashi S, Nagaoka M, Yokoyama N (2012) Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices. J Mater Chem 22:6765–6773

    Article  Google Scholar 

  • Kim BS, Lee JY (2014) Engineering of mixed host for high external quantum efficiency above 25% in green thermally activated delayed fluorescence device. Adv Funct Mater 24:3970–3977

    Article  Google Scholar 

  • Kulkarni AP, Tonzola CJ, Babel A, Jenekhe SA (2004) Electron transport materials for organic light-emitting diodes. Chem Mater 16:4556–4573

    Article  Google Scholar 

  • Lee J-H, Cheng S-H, Yoo S-J, Shin H, Chang J-H, Wu C-I, Wong K-T, Kim J-J (2015) An exciplex forming host for highly efficient blue organic light emitting diodes with low driving voltage. Adv Funct Mater 25:361–366

    Article  Google Scholar 

  • Montes VA, Perez-Bolivar C, Estrada LA, Shinar J, Anzenbacher P (2007) Ultrafast dynamics of triplet excitons in Alq(3)-bridge-Pt(II)porphyrin electroluminescent materials. J Am Chem Soc 129:12598–12599

    Article  Google Scholar 

  • Sasabe H, Kido J (2011) Multifunctional materials in high-performance OLEDs: challenges for solid-state lighting. Chem Mater 23:621–630

    Article  Google Scholar 

  • Sasabe H, Kido J (2013a) Recent progress in phosphorescent organic light-emitting devices. Eur J Org Chem 2013:7653–7663

    Article  Google Scholar 

  • Sasabe H, Kido J (2013b) Development of high performance OLEDs for general lighting. J Mater Chem C 1:1699–1707

    Article  Google Scholar 

  • Sasabe H, Gonmori E, Chiba T, Li YJ, Tanaka D, Su SJ, Takeda T, Pu YJ, Nakayama KI, Kido J (2008a) Wide-energy-gap electron-transport materials containing 3,5-dipyridylphenyl moieties for an ultra high efficiency blue organic light-emitting device. Chem Mater 20:5951–5953

    Article  Google Scholar 

  • Sasabe H, Chiba T, Su SJ, Pu YJ, Nakayama K, Kido J (2008b) 2-Phenylpyrimidine skeleton-based electron-transport materials for extremely efficient green organic light-emitting devices. Chem Commun (Camb) (44):5821–5823

    Google Scholar 

  • Sasabe H, Tanaka D, Yokoyama D, Chiba T, Pu Y-J, Nakayama K-I, Yokoyama M, Kido J (2011) Influence of substituted pyridine rings on physical properties and electron mobilities of 2-methylpyrimidine skeleton-based electron transporters. Adv Funct Mater 21:336–342

    Article  Google Scholar 

  • Sasabe H, Nakanishi H, Watanabe Y, Yano S, Hirasawa M, Pu Y-J, Kido J (2013) Extremely low operating voltage green phosphorescent organic light-emitting devices. Adv Funct Mater 23:5550–5555

    Article  Google Scholar 

  • Su S-J, Chiba T, Takeda T, Kido J (2008) Pyridine-containing triphenylbenzene derivatives with high electron mobility for highly efficient phosphorescent OLEDs. Adv Mater 20:2125–2130

    Article  Google Scholar 

  • Su SJ, Sasabe H, Pu YJ, Nakayama K, Kido J (2010) Tuning energy levels of electron-transport materials by nitrogen orientation for electrophosphorescent devices with an ‘Ideal’ operating voltage. Adv Mater 22:3311–3316

    Article  Google Scholar 

  • Sun C, Hudson ZM, Helander MG, Lu ZH, Wang SN (2011) A polyboryl-functionalized triazine as an electron transport material for OLEDs. Organometallics 30:5552–5555

    Article  Google Scholar 

  • Tanaka D, Sasabe H, Li Y-J, Su S-J, Takeda T, Kido J (2007) Ultra high efficiency green organic light-emitting devices. Jpn J Appl Phys 46:L10–L12

    Article  Google Scholar 

  • Tang CW, VanSlyke SA (1987) Organic electroluminescent diodes. Appl Phys Lett 51:913–915

    Article  ADS  Google Scholar 

  • Von Ruden AL, Cosimbescu L, Polikarpov E, Koech PK, Swensen JS, Wang L, Darsell JT, Padmaperuma AB (2010) Phosphine oxide based electron transporting and hole blocking materials for blue electrophosphorescent organic light emitting devices. Chem Mater 22:5678–5686

    Article  Google Scholar 

  • Watanabe Y, Sasabe H, Yokoyama D, Beppu T, Katagiri H, Pu Y-J, Kido J (2015) Simultaneous manipulation of intramolecular and intermolecular hydrogen bonds in n-type organic semiconductor layers: realization of horizontal orientation in OLEDs. Adv Opt Mater 3:769–773

    Article  Google Scholar 

  • Xiao L, Su S-J, Agata Y, Lan H, Kido J (2009) Nearly 100% internal quantum efficiency in an organic blue-light electrophosphorescent device using a weak electron transporting material with a wide energy gap. Adv Mater 21:1271–1274

    Article  Google Scholar 

  • Xiao L, Chen Z, Qu B, Luo J, Kong S, Gong Q, Kido J (2011) Recent progresses on materials for electrophosphorescent organic light-emitting devices. Adv Mater 23:926–952

    Article  Google Scholar 

  • Yokoyama D, Sakaguchi A, Suzuki M, Adachi C (2009) Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films. Appl Phys Lett 95:243303

    Article  ADS  Google Scholar 

  • Yokoyama D, Sasabe H, Furukawa Y, Adachi C, Kido J (2011) Molecular stacking induced by intermolecular C-H···N hydrogen bonds leading to high carrier mobility in vacuum-deposited organic films. Adv Funct Mater 21:1375–1382

    Article  Google Scholar 

  • Yook KS, Lee JY (2012) Organic materials for deep blue phosphorescent organic light-emitting diodes. Adv Mater 24:3169–3190

    Article  Google Scholar 

  • Zhang Q, Li B, Huang S, Nomura H, Tanaka H, Adachi C (2014) Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence. Nat Photonics 8:326–332

    Article  ADS  Google Scholar 

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Author information

Authors and Affiliations

  1. Department of Organic Device Engineering, Yamagata University, Yonezawa, Japan

    Hisahiro Sasabe & Junji Kido

  2. Graduate School of Organic Materials Science, Research Center for Organic Electronics, Yamagata University, Yamagata, Japan

    Hisahiro Sasabe

Authors
  1. Hisahiro Sasabe
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  2. Junji Kido
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Corresponding author

Correspondence to Hisahiro Sasabe .

Editor information

Editors and Affiliations

  1. Department of Applied Chemistry and Biochemistry, Kyushu University, Fukuoka, Japan

    Chihaya Adachi

  2. Art, Science and Technology Center for Cooperative Research, Kyushu University KASTEC, Fukuoka, Japan

    Reiji Hattori

  3. Institute for Chemical Research Division of Environmental Chemistry, Kyoto University, Kyoto, Japan

    Hironori Kaji

  4. Konica Minolta Pioneer OLED, Inc., Konica Minolta, Inc., Tokyo, Japan

    Takatoshi Tsujimura

Section Editor information

  1. Division of Environmental Chemistry, Institute for Chemical Research, Kyoto University, Kyoto, Japan

    Hironori Kaji

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Sasabe, H., Kido, J. (2019). Low Molecular Weight Materials: Electron-Transport Materials. In: Adachi, C., Hattori, R., Kaji, H., Tsujimura, T. (eds) Handbook of Organic Light-Emitting Diodes. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55761-6_51-1

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  • DOI: https://doi.org/10.1007/978-4-431-55761-6_51-1

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  • Publisher Name: Springer, Tokyo

  • Print ISBN: 978-4-431-55761-6

  • Online ISBN: 978-4-431-55761-6

  • eBook Packages: Springer Reference Physics and AstronomyReference Module Physical and Materials ScienceReference Module Chemistry, Materials and Physics

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