离域电子
纳米晶
量子产额
配体(生物化学)
钙钛矿(结构)
材料科学
光致发光
八面体
发光二极管
超分子化学
量子效率
光化学
结晶学
化学
纳米技术
光电子学
晶体结构
荧光
有机化学
生物化学
物理
受体
量子力学
作者
Po Lu,Ting Li,Min Lu,Cheng Ruan,Sheng Sun,Zhennan Wu,Yuan Zhong,Fujun Zhang,Yuan Gao,Yao‐Wei Huang,Yan Wang,Junhua Hu,Fengping Yan,Yu Zhang
标识
DOI:10.1038/s41377-023-01266-4
摘要
Abstract Considering the multi-functionalization of ligands, it is crucial for ligand molecular design to reveal the landscape of anchoring sites. Here, a typical triphenylphosphine (TPP) ligand was employed to explore its effect on the surface of CsPbI 3 perovskite nanocrystals (PNCs). Except for the conventionally considered P-Pb coordination, an P-I supramolecular halogen bonding was also found on the NC surface. The coexistence of the above two types of bonding significantly increased the formation energy of iodine vacancy defects and improved the photoluminescence quantum yield of PNCs up to 93%. Meanwhile, the direct interaction of P and I enhanced the stability of the Pb-I octahedra and dramatically inhibited the migration of I ions. Furthermore, the introduction of additional benzene rings (2-(Diphenylphosphino)-biphenyl (DPB)) increased the delocalized properties of the PNC surface and significantly improved the charge transport of the PNCs. As a result, the DPB passivated CsPbI 3 NCs based top-emitting LEDs exhibite a peak external quantum efficiency (EQE) of 22.8%, a maximum luminance of 15, 204 cd m −2 , and an extremely low-efficiency roll-off of 2.6% at the current density of 500 mA cm −2 .
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