Reducing the size of perovskite crystals to confine excitons and passivating surface defects has fueled a significant advance in the luminescence efficiency of perovskite light-emitting diodes (LEDs). However, the persistent gap between the optical limit of electroluminescence efficiency and the photoluminescence efficiency of colloidal perovskite nanocrystals (PeNCs) suggests that defect passivation alone is not sufficient to achieve highly efficient colloidal PeNC-LEDs. Here, we present a materials approach to controlling the dynamic nature of the perovskite surface. Our experimental and theoretical studies reveal that conjugated molecular multipods (CMMs) adsorb onto the perovskite surface by multipodal hydrogen bonding and van der Waals interactions, strengthening the near-surface perovskite lattice and reducing ionic fluctuations which are related to nonradiative recombination. The CMM treatment strengthens the perovskite lattice and suppresses its dynamic disorder, resulting in a near-unity photoluminescence quantum yield of PeNC films and a high external quantum efficiency (26.1%) of PeNC-LED with pure green emission that matches the Rec.2020 color standard for next-generation vivid displays.

减小钙钛矿晶体的尺寸以限制激子和钝化表面缺陷，推动了钙钛矿发光二极管（LED）发光效率的显着进步。然而，电致发光效率的光学极限与胶体钙钛矿纳米晶体（PeNC）的光致发光效率之间持续存在的差距表明，仅缺陷钝化不足以实现高效的胶体PeNC-LED。在这里，我们提出了一种控制钙钛矿表面动态性质的材料方法。我们的实验和理论研究表明，共轭分子多足（CMM）通过多足氢键和范德华相互作用吸附在钙钛矿表面，增强了近表面钙钛矿晶格并减少了与非辐射复合相关的离子波动。 CMM 处理增强了钙钛矿晶格并抑制其动态无序，从而使 PeNC 薄膜的光致发光量子产率接近一致，并且具有与 Rec.2020 颜色匹配的纯绿光发射的高外量子效率 (26.1%)。下一代生动显示的标准。