%0 Journal Article
%T Emissive and charge-generating donor每acceptor interfaces for organic optoelectronics with low voltage losses
%J -
%D 2019
%R https://doi.org/10.1038/s41563-019-0324-5
%X 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 diodes1,2. Non-radiative charge-transfer state decay is dominant in state-of-the-art D每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每0.0001% range3,4. In contrast, the electroluminescence external quantum yield reaches up to 16% in D每A-based organic light-emitting diodes5,6,7. 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每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每A blends in energy conversion applications involving visible and ultraviolet photons8,9,10,11
%U https://www.nature.com/articles/s41563-019-0324-5