期刊
NATURE MATERIALS
卷 18, 期 5, 页码 459-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0324-5
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资金
- German Federal Ministry for Education and Research (BMBF) [03IPT602X]
- German Research Foundation (DFG) [VA 1035/5-1]
- China Scholarship Council [201706140127, 201506920047]
- DFG [382633022, SFB 951, RE 3198/6-1]
Intermolecular charge-transfer states at the interface between electron donating (D) and accepting (A) materials are crucial for the operation of organic solar cells but can also be exploited for organic light-emitting diodes(1,2). Non-radiative charge-transfer state decay is dominant in state-of-the-art D-A-based organic solar cells and is responsible for large voltage losses and relatively low power-conversion efficiencies as well as electroluminescence external quantum yields in the 0.01-0.0001% range(3,4). In contrast, the electroluminescence external quantum yield reaches up to 16% in D-A-based organic light-emitting diodes(5-7). Here, we show that proper control of charge-transfer state properties allows simultaneous occurrence of a high photovoltaic and emission quantum yield within a single, visible-light-emitting D-A system. This leads to ultralow-emission turn-on voltages as well as significantly reduced voltage losses upon solar illumination. These results unify the description of the electro-optical properties of charge-transfer states in organic optoelectronic devices and foster the use of organic D-A blends in energy conversion applications involving visible and ultraviolet photons(8-11).
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