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Advanced Materials

High-Efficiency Deep-Blue-Phosphorescent Organic Light-Emitting Diodes Using a Phosphine Oxide and a Phosphine Sulfide High-Triplet-Energy Host Material with Bipolar Charge-Transport Properties

Authors

  • Soon Ok Jeon,

    1. Department of Polymer Science and Engineering Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701 (Korea)
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  • Kyoung Soo Yook,

    1. Department of Polymer Science and Engineering Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701 (Korea)
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  • Chul Woong Joo,

    1. Department of Polymer Science and Engineering Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701 (Korea)
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  • Jun Yeob Lee

    Corresponding author
    1. Department of Polymer Science and Engineering Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701 (Korea)
    • Department of Polymer Science and Engineering Dankook University 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701 (Korea).
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Abstract

Highly efficient deep-blue-phosphorescent organic light-emitting diodes have been developed using bipolar-type high-triplet-energy host materials with a carbazole core and two phosphine oxide (PPO21) or phosphine sulfide (PPS21) units. A high quantum efficiency of 19.2% with a deep-blue color coordinate of (0.14,0.16) was achieved in the deep-blue device with PPO21 as a host material (see figure).

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