期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202380
关键词
BT; 2020 Green; Multi-Resonance; Polycyclic Aromatic Hydrocarbons; Spectral Narrowing
资金
- National Key Basic Research and Development Program of China [2020YFA0715000, 2017YFA0204501]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- National Science Fund of China [51903137, 61890942]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-005]
- Young Elite Scientists Sponsorship Program by CAST [2019-2021QNRC]
- Tsinghua-Foshan Innovation Special Fund (TFISF) [2020THFS0116]
- China Postdoctoral Science Foundation [2021M691751]
This study presents a strategy to achieve ultra-pure green emissions by suppressing shoulder peaks in the emission spectra of conventional polycyclic aromatic hydrocarbons (PAHs). By synthesizing multi-resonance fragments with conventional PAH, extended pi-conjugation lengths, increased molecular rigidity, and reduced vibrational frequency were simultaneously achieved. The proof-of-concept emitters showed excellent optical properties and have the potential for wide applications in organic optoelectronic devices.
Herein, we report a general strategy for achieving ultra-pure green emissions by suppressing the shoulder peaks in the emission spectra of conventional polycyclic aromatic hydrocarbons (PAHs). Through precise synthetic fusion of multi-resonance (MR) fragments with conventional PAH, extended pi-conjugation lengths, increased molecular rigidity, and reduced vibrational frequency could be simultaneously realized. The proof-of-concept emitters exhibited ultra-pure green emissions with dominant peaks at ca. 521 nm, photoluminescence quantum yields that are greater than 99 %, a small full-width-at-half-maximum of 23 nm, and CIE coordinates of (0.16, 0.77). The bottom-emitting organic light-emitting diode (OLED) exhibited a record-high CIEy value of 0.74 and a high maximum external quantum efficiency of 30.5 %. The top-emitting OLED not only achieved a BT.2020 green color (CIE: 0.17, 0.78) for the first time but also showed superior performance among all green OLED devices, with a current efficiency of 220 cd A(-).
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