writer：Di Shen, Jianhao Ding, Yuhang Tan, Yujie Wen, Xinning Wang, Xiankan Zeng, Maolin Mu, Chenglong Li, Jingjing Cao, Xiaoqiang Fan, Weiqing Yang, Wen Li
keywords：Perovskite quantum dots，Surface passivation，P-type electronic modulation，Charge balance，Stability
source：期刊
Issue time：2026年

Perovskite quantum-dot light-emitting diodes (PeQLEDs) remain limited by coupled surface and interfacial losses: labile ligand binding produces trap-rich perovskite quantum dot (PeQD) surfaces while unbalanced carrier injection accelerates interfacial charge accumulation and nonradiative recombination. Here, triphenylmethylium tetrakis(pentafluorophenyl)borate (TrTPFB) is introduced as a fluorinated ionic molecule to synergistically regulate both the surface coordination and charge-injection behavior of FAPbBr? PeQDs. Density functional theory (DFT) calculations reveal pronounced charge redistribution between TrTPFB and the PeQD surface. Experimental results show that the fluorinated tetrakis(pentafluorophenyl)borate (TPFB-) anion and the posi tively charged triphenylmethylium (Tr+) cation cooperatively stabilize the surface coordination environment and suppress trap-mediated nonradiative recombination. TrTPFB also induces p-type electronic modulation of the PeQD film, shifts the Fermi level toward the valence band, lowers the hole-injection barrier, and mitigates interfacial charge accumulation. Consequently, The combined operation of these mechanisms significantly im proves the photoluminescence quantum yield (PLQY) of perovskite films to an impressive 98.50%. The * Corresponding author. E-mail address: liwen3337@swjtu.edu.cn (W. Li). Contents lists available at ScienceDirect Journal of Colloid And Interface Science journal homepage: www