Fusion of Multi‐Resonance Fragment with Conventional Polycyclic Aromatic Hydrocarbon for Nearly BT.2020 Green Emission

• DOI: 10.1002/anie.202202380
• Publication Date: 2022-04-01T14:58:56Z
• Authors: Yuewei Zhang; Guomeng Li; Lu Wang; Tianyu Huang; Jinbei Wei; Guoyun Meng; Xiang Wang; Xuan Zeng; Dongdong Zhang; Lian Duan
• Keywords: Quantum Efficiency; Polycyclic aromatic hydrocarbon; Green-light; Rigidity (electromagnetism)

Herein, we report a general strategy for achieving ultra-pure green emissions by suppressing the shoulder peaks in emission spectra of conventional polycyclic aromatic hydrocarbons (PAHs). Through precise synthetic fusion multi-resonance (MR) fragments with PAH, extended π-conjugation lengths, increased molecular rigidity, and reduced vibrational frequency could be simultaneously realized. The proof-of-concept emitters exhibited dominant at ca. 521 nm, photoluminescence quantum yields that are greater than 99 %, small full-width-at-half-maximum 23 CIE coordinates (0.16, 0.77). bottom-emitting organic light-emitting diode (OLED) record-high CIEy value 0.74 high maximum external efficiency 30.5 %. top-emitting OLED not only achieved BT.2020 color (CIE: 0.17, 0.78) first time but also showed superior performance among all devices, current 220 cd A- .