教師資料查詢 | 類別: 期刊論文 | 教師: 徐秀福 Hsiu-fu Hsu (瀏覽個人網頁)

標題:Modulation of Solid-State Aggregation of Square-Planar Pt(II) Based Emitters: Enabling Highly Efficient Deep-Red/ Near Infrared Electroluminescence
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出版(發表)日期2020/04/30
作品名稱Modulation of Solid-State Aggregation of Square-Planar Pt(II) Based Emitters: Enabling Highly Efficient Deep-Red/ Near Infrared Electroluminescence
作品名稱(其他語言)
著者Wen-Cheng Chen; Chattarika Sukpattanacharoen; Wei-Hsiang Chan; Chun-Chi Huang; Hsiu-Fu Hsu; Dong Shen; Wen-Yi Hung; Nawee Kungwan; Daniel Escudero; Chun-Sing Lee; Yun Chi
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著錄名稱、卷期、頁數Advanced Functional Materials,30(25),2002494
摘要The design of square-planar Pt(II) complexes with highly efficient solid-state near infrared (NIR) luminescence for electroluminescence is attractive but challenging. This study presents the fine-turning of excited-state properties and application of a series of isoquinolinyl pyrazolate Pt(II) complexes that are modulated by steric demanding substituents. It reveals that the bulky substituents do not always disfavor metallophilic Pt···Pt interactions. Instead, π–π stacking among chelates, which are fine-tuned by the associated substituents, also exerts strong influence to the metal-metal-to-ligand charge transfer (MMLCT) transition character. Theoretical calculations indicate that Pt···Pt contacts become more relevant in the trimers rather than the dimers, especially in their T1 states, associated with a change from mixed 3LC/3MLCT transition in the monomer/dimer to mixed 3LC/3MMLCT transition character in the trimer. Electroluminescence devices affording intense deep-red/NIR emission (near 670 nm) with unprecedentedly high external quantum efficiency over 30% are demonstrated. This work provides deep insights into formation MMLCT transition of square-planar Pt(II) complexes and efficient molecular design for deep-red/NIR electroluminescence.
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