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A Multifunctional Blue-Emitting Material Designed via Tuning Distribution of Hybridized Excited-State for High-Performance Blue and Host-Sensitized OLEDs

机译：通过调谐杂交兴奋状态的多功能蓝色发光材料，用于高性能蓝色和主机敏化OLED

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摘要

Actualizing full singlet exciton yield via a reverse intersystem crossing from the high-lying triplet state to singlet state, namely, "hot exciton" mechanism, holds great potential for high-performance fluorescent organic light-emitting diodes (OLEDs). However, incorporating comprehensive insights into the mechanism and effective molecular design strategies still remains challenging. Herein, three blue emitters (CNNPI, 2TriPE-CNNPI, and 2CzPh-CNNPI) with a distinct local excited (LE) state and charge-transfer (CT) state distributions in excited states are designed and synthesized. They show prominent hybridized local and charge-transfer (HLCT) states and aggregation-induced emission enhancement properties. The "hot exciton" mechanism based on these emitters reveals that a balanced LE/CT distribution can simultaneously boost photoluminescence efficiency and exciton utilization. In particular, a nearly 100% exciton utilization is achieved in the electroluminescence (EL) process of 2CzPh-CNNPI. Moreover, employing 2CzPh-CNNPI as the emitter, emissive dopant, and sensitizing host, respectively, the EL performances of the corresponding nondoped pure-blue, doped deep-blue, and HLCT-sensitized fluorescent OLEDs are among the most efficient OLEDs with a "hot exciton" mechanism to date. These results could shed light on the design principles for "hot exciton" materials and inspire the development of next-generation high-performance OLEDs.
机译：通过从高躺式三联状态的反向交叉系统实现全单线态激子产量，从高躺式三联状态到单线状态，即“热激子”机构，对高性能荧光有机发光二极管（OLED）具有很大的潜力。但是，综合了解机制和有效的分子设计策略仍然持挑战性。这里，设计并合成了具有不同局部激发（LE）状态和电荷转移（CT）状态分布的三种蓝色发射器（CNNPI，2TRIPH-CNNPI和2CZPH-CNNPI）。它们显示出突出的杂交局部和电荷转移（HLCT）状态和聚集诱导的发射增强性能。基于这些发射器的“热激子”机制揭示了平衡的LE / CT分布可以同时提高光致发光效率和激子利用。特别地，在2Czph-cnnPI的电致发光（EL）过程中实现了近100％的Exciton利用。此外，采用2Czph-CNNPI作为发射极，发光掺杂剂和敏化宿主，相应的纯蓝色，掺杂深蓝色和HLCT敏化荧光OLED的EL性能分别是最有效的OLED中“热激子“迄今为止的机制。这些结果可以阐明“热激子”材料的设计原则，并激发了下一代高性能OLED的发展。

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  • 来源
    《Advanced Functional Materials》 |2020年第35期|2002323.1-2002323.10|共10页
  • 作者

    Zhang Han; Zhang Bing; Zhang Yiwen; Xu Zeng; Wu Haozhong; Yin Ping-An; Wang Zhiming; Zhao Zujin; Ma Dongge; Tang Ben Zhong;

  • 作者单位

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China;

    South China Univ Technol SCUT State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Luminescence Mol Aggregate Ctr Aggregat Induced Emiss Guangzhou Int Campus Guangzhou 510640 Peoples R China|Hong Kong Univ Sci & Technol HKUST) Dept Chem Kowloon Clear Water Bay Hong Kong Peoples R China;

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  • 正文语种 eng
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  • 关键词

    aggregation-induced emission; charge-transfer states; energy transfer; "hot exciton" mechanism; organic light-emitting diodes;

    机译：聚集诱导的发射;电荷转移状态;能量转移;“热激子”机制;有机发光二极管;

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