The minimization of nonradiative recombination losses is essential to transcend the efficiency of state-of-the-art organic solar cells (OSCs) and near-infrared (NIR) organic light-emitting diodes (OLEDs). Indeed, reduced nonradiative processes will result in high electroluminescence (EL), external quantum efficiency (EQE_EL), and low nonradiative voltage losses (ΔV_OC,nr) for OSCs. Here, we study the EL properties of a set of polymer-small molecule blends and find a relationship between the EL emission linewidth, EQE_EL, and ΔV_OC,nr. Based on these findings, we reduce ΔV_OC,nr from the typical values around 250 mV down to an unprecedented value of 155 mV using a blend comprising a low-molecular-weight PM6 polymer donor and a highly emissive nonfullerene acceptor (Y16F). Importantly, the PM6:Y16F blend yields an EQE_EL (0.52%) among the best reported fluorescent NIR-OLEDs in the 900-nm range. These findings clearly indicate the existence of organic material blends that combine both excellent photovoltaic and electroluminescent properties.

非辐射复合损失的最小化对于超越最先进的有机太阳能电池 (OSC) 和近红外 (NIR) 有机发光二极管 (OLED) 的效率至关重要。事实上，减少非辐射过程将导致OSC 的高电致发光 (EL)、外量子效率 (EQE _EL ) 和低非辐射电压损失 (Δ V _OC,nr )。在这里，我们研究了一组聚合物-小分子混合物的 EL 特性，并发现了 EL 发射线宽、EQE _EL和 Δ V _OC,nr之间的关系。基于这些发现，我们降低了ΔV _OC,nr使用包含低分子量 PM6 聚合物供体和高发射性非富勒烯受体 (Y16F) 的混合物，将典型值从大约 250 mV 降至前所未有的 155 mV。重要的是，PM6:Y16F 混合物产生的 EQE _EL (0.52%) 在 900 nm 范围内报告的荧光 NIR-OLED 中处于最佳状态。这些发现清楚地表明存在兼具优异光伏和电致发光特性的有机材料混合物。