Continuous production of stable chiral perovskite nanocrystals in electrospinning nanofibers to exhibit circularly polarized luminescence. Issue 35 (17th August 2022)

• Record Type: Journal Article
• Authors: Liang, Zhi-Bin; Chen, Xu; Liao, Xiang-Ji; Li, Jing-Jing; Yang, Yue; Wang, Cai-Feng; Zheng, You-Xuan; Chen, Su
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 35(2022)
• Page Start: 12644
• Page End: 12651
• Publication Date: 2022-08-17
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc02090d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Fiber-spinning chemistry directs the in situ synthesis of stable chiral perovskite nanocrystals in polyacrylonitrile (PAN) nanofibers in one step, to exhibit high fluorescence quantum yield of 88% and robust circularly polarized luminescence. Abstract : Methods allowing the facile synthesis of chiral nanomaterials with interesting chiroptical properties are highly desirable. Herein, guided by fiber-spinning chemistry (FSC), we develop a one-step strategy enabling continuous production of stable chiral perovskite nanocrystals (PNCs) with high photoluminescence (PL) quantum yields (QYs) and circularly polarized luminescence (CPL). The FSC process uses spinning nanofibers of polyacrylonitrile (PAN) as reactors for in situ generation of chiral methylammonium lead bromine (MAPbBr3 ) PNCs tailored with R -(+)-methylbenzylammonium bromide ( R -MBABr) or ( S )-(−)-methylbenzylammonium bromide ( S -MBABr). The resultant R ( S )-MBABr-modified MAPbBr3 PNCs/PAN nanofiber films, referred to as R ( S )-PNCs/PAN nanofiber films, show green fluorescence with a high PL QY of up to 88%, and preserve a PL QY of 60% after storage in the atmosphere for 180 days ( vs. complete fluorescence quenching in 1 day in air for pristine R ( S )-PNCs). Significantly, these nanofiber films exhibit circular dichroism (CD) and circularly polarized luminescence (CPL) with dissymmetry factor ( g lum ) values of 10 −3 at room temperature. Structural and optical characterization results confirm that R ( S )-MBABr passivates the surface defects of MAPbBr3 PNCs to highly enhance the PL QY, and guarantees chirality transfer into PNCs to cause chiroptical features of CD and CPL, while the PAN nanofiber encapsulation greatly improves the PL stability of chiral PNCs. The R ( S )-PNCs/PAN nanofiber films with excellent optical properties and stability are potential candidates for various optoelectronic applications.