期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29759-7
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资金
- National Natural Science Foundation of China [51925303]
- Leverhulme Trust
- Royal Society [URF\R1\201300, URF\R1\201502]
- EPSRC [EP/L011972/1, EP/M01083X/1, EP/M005143/1]
- Talents Cultivation Programme (Jilin University, China)
- Simons Foundation [601946]
- ERC under the European Union's Horizon 2020 research and innovation programme [670405, 101020167]
- European Research Council (ERC) [101020167] Funding Source: European Research Council (ERC)
Organic light-emitting diodes overcome efficiency limits by unlocking energy transfer channels between singlet, triplet, and doublet excitons.
Organic light-emitting diodes must be engineered to circumvent efficiency limits imposed by the ratio of triplet to singlet exciton formation, following electron-hole capture. Here, authors unlock energy transfer channels between singlet, triplet and doublet excitons using thermally activated delayed fluorescence and radical emitters towards more efficient light-emitting devices. Organic light-emitting diodes (OLEDs) must be engineered to circumvent the efficiency limit imposed by the 3:1 ratio of triplet to singlet exciton formation following electron-hole capture. Here we show the spin nature of luminescent radicals such as TTM-3PCz allows direct energy harvesting from both singlet and triplet excitons through energy transfer, with subsequent rapid and efficient light emission from the doublet excitons. This is demonstrated with a model Thermally-Activated Delayed Fluorescence (TADF) organic semiconductor, 4CzIPN, where reverse intersystem crossing from triplets is characteristically slow (50% emission by 1 mu s). The radical:TADF combination shows much faster emission via the doublet channel (80% emission by 100 ns) than the comparable TADF-only system, and sustains higher electroluminescent efficiency with increasing current density than a radical-only device. By unlocking energy transfer channels between singlet, triplet and doublet excitons, further technology opportunities are enabled for optoelectronics using organic radicals.
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