Intramolecular Cyclization: A Convenient Strategy to Realize Efficient BT.2020 Blue Multi‐Resonance Emitter for Organic Light‐Emitting Diodes

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  • Chen Cao
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Ji‐Hua Tan
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Ze‐Lin Zhu
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Jiu‐Dong Lin
    WISPO Advanced Materials (Suzhou) Co., Ltd. No. Building 12, 200 Xingpu Rd, SIP Suzhou P. R. China
  • Hong‐Ji Tan
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Huan Chen
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Yi Yuan
    School of Chemistry and Chemical Engineering University of South China Hengyang 421001 P. R. China
  • Man‐Kit Tse
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Wen‐Cheng Chen
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China
  • Chun‐Sing Lee
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR 999077 P. R. China

説明

<jats:title>Abstract</jats:title><jats:p>Rationally tuning the emission position and narrowing the full width at half‐maximum (FWHM) of an emitter is of great importance for many applications. By synergistically improving rigidity, strengthening the resonant strength, inhibiting molecular bending and rocking, and destabilizing the HOMO energy level, a deep‐blue emitter (CZ2CO) with a peak wavelength of 440 nm and an ultranarrow spectral FWHM of 16 nm (0.10 eV) was developed via intramolecular cyclization in a carbonyl/N resonant core (QAO). The dominant υ<jats:sub>0‐0</jats:sub>transition character of CZ2CO gives a Commission Internationale de I’Éclairage coordinates (CIE) of (0.144, 0.042), nicely complying with the BT.2020 standard. Moreover, a hyper‐fluorescent device based on CZ2CO shows a high maximum external quantum efficiency (EQE<jats:sub>max</jats:sub>) of 25.6 % and maintains an EQE of 22.4 % at a practical brightness of 1000 cd m<jats:sup>−2</jats:sup>.</jats:p>

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