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Phosphorescence Quantum Efficiency and Intermolecular Interaction of Iridium(III) Complexes in Co-Deposited Films with Organic Semiconducting Hosts

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Abstract

We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films by using an integrating sphere. We measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq3), and a phosphorescent 1.5mol%-/ac-tris(2-phenylpyridyl)iridium(in):4,4'-bis(carbazol-9-yl)-2,2'-biphenyl [Ir(ppy)3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20 ± 1% and 97 ± 2%, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl)pyridinato-N,C3'] (acetylacetonato) iridium(III) [Btp2Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl)pyridinato -N,C2](picolinato)iridium(III) [FIrpic], with m-bis(N-carbazolyl)benzene. The maximum ηpl values for Btp2lr(acac), and FIrpic were 51±1% (at 1.4mol%), and 99±1% (1.2mol%), respectively. These results suggest that the ηel of red phosphorescent OLEDs using Btp2Ir(acac) as the dopant can be as high as 10%, and blue devices using FIrpic can reach the theoretical limit of 20%.

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Authors and Affiliations

  1. CREST program, Japan Science and Technology Agency (JST), 1-32-12 Higashi, Shibuya, Tokyo, 150-0011, Japan

    Yuichiro Kawamura, Hiroyuki Sasabe & Chihaya Adachi

  2. Department of Photonics Materials Science, Chitose Institute of Science & Technology (CIST), 758-65 Bibi, Chitose, Hokkaido, 066-8655, Japan

    Kenichi Goushi, Hiroyuki Sasabe & Chihaya Adachi

  3. Universal Display Corporation, 375 Phillips Blvd., Ewing, NJ, 08618, USA

    Jason Brooks & Julie J. Brown

Authors
  1. Yuichiro Kawamura
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  2. Kenichi Goushi
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  3. Jason Brooks
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  4. Julie J. Brown
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  5. Hiroyuki Sasabe
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  6. Chihaya Adachi
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Kawamura, Y., Goushi, K., Brooks, J. et al. Phosphorescence Quantum Efficiency and Intermolecular Interaction of Iridium(III) Complexes in Co-Deposited Films with Organic Semiconducting Hosts. MRS Online Proceedings Library 846, 45 (2004). https://doi.org/10.1557/PROC-846-DD4.5

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  • DOI: https://doi.org/10.1557/PROC-846-DD4.5

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