期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 42, 页码 15681-15707出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc03316j
关键词
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资金
- Science and Engineering Research Board [SRG/2020/000080]
- Indian Institute of Technology Jammu [SGT-100028]
- University Grants Commission [DEC19C00758]
The rise of organic thermally activated delayed fluorescence (TADF) materials as NIR emitters and hosts has gained wide attention due to their capability of achieving 100% internal quantum efficiency. These materials outperform phosphorescent noble-metal complexes in terms of cost-efficiency without compromising OLED performance. The numerous applications of NIR-TADF emitters in the NIR spectrum, such as telecommunication and night-vision display, highlight the need for efficient design strategies. This review explores various approaches adopted in recent years to design high-efficiency purely organic NIR-TADF emitters.
The rise of organic thermally activated delayed fluorescence (TADF) materials as NIR emitters and hosts have engrossed wide consideration as they can demonstrate 100% internal quantum efficiency. These materials have exceeded the phosphorescent noble-metal complexes due to cost-efficiency without compromising the OLED performance. Numerous applications of the NIR spectrum, e.g., in telecommunication, night-vision display, biomedical applications, and chemical sensors, render the NIR-TADF emitters vulnerable to evolution. This review highlights the various strategies adopted in the recent past (2015-2022) to judiciously design purely organic NIR-TADF emitters (lambda(max)(PL/EL) > 700 nm) with in-depth discussions of photophysical and device-electroluminescence studies. Approaches such as the incorporation of extended pi-conjugated acceptors, diazoles of group-16 elements, 'BF2'-acceptor, non-conjugated donor-acceptor dendrons, exciplex formation, and TADF sensitization provide effective pathways to construct high-efficiency NIR-TADF-OLEDs. Thus, this review aims to provide a new perspective for the next generation researchers to implement strategies for the thoughtful design of efficient NIR-TADF materials.
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