期刊
CHEMICAL SCIENCE
卷 8, 期 4, 页码 2677-2686出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sc04863c
关键词
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资金
- JSPS (Japan Society for the Promotion of Science)
- MEXT (Ministry of Education, Culture, Science and Technology, Japan) [JP15H00997]
- Japan Prize Foundation
- [641725]
- Grants-in-Aid for Scientific Research [15H00997] Funding Source: KAKEN
Novel U-shaped donor-acceptor-donor (D-A-D) pi-conjugated multi-functional molecules comprising dibenzo[a,j]phenazine (DBPHZ) as an acceptor and phenothiazines (PTZ) as donors have been developed. Most importantly, the D-A-D compounds exhibit not only distinct tricolor-changeable mechanochromic luminescence (MCL) properties but also efficient thermally activated delayed fluorescence (TADF). Quantum chemical calculations, X-ray diffraction analysis, and systematic studies on the photophysical properties indicated that the two-conformation-switchable PTZ units play a highly important role in achieving multi-color-changing MCL. Time-resolved photophysical measurements revealed that the developed D-A-D compounds also exhibit efficient orange-TADF. Furthermore, organic light-emitting diode (OLED) devices fabricated with the new TADF emitters have achieved high external quantum efficiencies (EQEs) up to 16.8%, which significantly exceeds the theoretical maximum (similar to 5%) of conventional fluorescent emitters.
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