Quasi-two-dimensional (quasi-2D) Ruddlesden-Popper (RP) phase perovskite materials exhibiting quantum confinement effect are promising candidates for realizing high-performance blue perovskite light-emitting diodes (PeLEDs). However, the performance of blue PeLEDs based on quasi-2D perovskites remains unsatisfactory, as it is limited by non-ideal charge transport, energy transfer, and defect. Here, a series of bifunctional phosphonic acid additives with synergistic effects are reported. These additives passivate defects and reduce non-radiative recombination losses by coordinating PO functional group with unsaturated Pb, and they promote energy transfer and radiative recombination by optimizing the proportion of small n phases and large n phases. Owing to the synergistic effects of passivation and energy transfer, optimized blue PeLEDs (∼486 nm) with 3-phosphonopropionic acid (3-PA) additive exhibits a champion EQE of 13.11%, which is exceptionally high for blue PeLEDs.

中文翻译：

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用于高性能蓝色钙钛矿发光二极管的膦酸基双功能添加剂

具有量子限制效应的准二维（quasi-2D）Ruddlesden-Popper（RP）相钙钛矿材料是实现高性能蓝色钙钛矿发光二极管（PeLED）的有希望的候选材料。然而，基于准二维钙钛矿的蓝色PeLED的性能仍然不能令人满意，因为它受到非理想电荷传输、能量转移和缺陷的限制。本文报道了一系列具有协同效应的双功能膦酸添加剂。这些添加剂通过PO官能团与不饱和Pb配位来钝化缺陷并减少非辐射复合损失，并通过优化小n相和大n相的比例来促进能量转移和辐射复合。由于钝化和能量转移的协同效应，使用 3-膦酰基丙酸 (3-PA) 添加剂优化的蓝色 PeLED (∼486 nm) 表现出 13.11% 的冠军 EQE，这对于蓝色 PeLED 来说是非常高的。