Enrichment of anchoring sites by introducing supramolecular halogen bonds for the efficient perovskite nanocrystal LEDs  

作　　者：Po Lu Ting Li Min Lu Cheng Ruan Siqi Sun Zhennan Wu Yuan Zhong Fujun Zhang Yanbo Gao Yaowei Huang Yang Wang Junhua Hu Fengping Yan Yu Zhang 

机构地区：[1]State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering,Jilin University,Changchun,China [2]School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing,China [3]Changchun Cedar Electronics Technology Co.,Ltd.,Changchun,China [4]Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,China [5]Key Laboratory of Materials Physics of Ministry of Education Department of Physics and Engineering,Zhengzhou University,Zhengzhou,China

出　　处：《Light(Science & Applications)》2023年第10期2122-2130,共9页光（科学与应用)（英文版）

基　　金：supports from the National Natural Science Foundation of China(61827818,12104178,61935009,12204193,12174151);Science and Technology Development Program of Jilin Province(20230201055GX,20200401059GX,20220101008JC).

摘　　要：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).

关 键 词：HALO bonding quantum 

分 类 号：TN3[电子电信—物理电子学]