Dual-Mode Induction of Tunable Circularly Polarized Luminescence from Chiral Metal-Organic Frameworks

Tonghan Zhao; Jianlei Han; Xue Jin; Minghao Zhou; Yan Liu; Pengfei Duan; Minghua Liu

doi:10.34133/2020/6452123

Dual-Mode Induction of Tunable Circularly Polarized Luminescence from Chiral Metal-Organic Frameworks

Research (Wash D C). 2020 Jan 23:2020:6452123. doi: 10.34133/2020/6452123. eCollection 2020.

Authors

Tonghan Zhao^{1

2}, Jianlei Han¹, Xue Jin¹, Minghao Zhou¹, Yan Liu³, Pengfei Duan^{1

2}, Minghua Liu^{1

2

4}

Affiliations

¹ CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), No. 11, ZhongGuanCun BeiYiTiao, 100190 Beijing, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.
³ School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
⁴ Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2, ZhongGuanCun BeiYiJie, Beijing 100190, China.

Abstract

The general approach for fabricating solid-state materials showing circularly polarized luminescence (CPL) is still in its challenge. In this work, chiral metal-organic frameworks (MOFs) with full-color and white-color circularly polarized light emission are firstly achieved through a host-guest emitter-loading strategy. Chiral zeolitic imidazolate frameworks (ZIFs, a class of MOFs) are fabricated by a facile and simple mixed-ligand coassembly pathway. Meantime, achiral dyes, quantum dots (QDs), and upconversion nanoparticles (UCNPs) are easily loaded into the chiral ZIFs during the synthetic process. Size-matched dyes can be solely encapsulated into the chiral cages of ZIF, resulting in induced CPL and enhanced luminescence efficiency in solid-state ZIF⊃dye composites. Large-sized QDs, after embedding into the gap of the ZIF particles, also exhibited intense CPL activity. Furthermore, through modulating the blending ratio of colored dyes or QDs in chiral ZIFs, white light-emitting ZIFs with circular polarization could be constructed in a solid state. In addition, through loading rare earth element-based upconversion nanoparticles (UCNPs) into chiral ZIFs, upconverted CPL (UC-CPL) could be achieved with a high dissymmetry factor (g _lum). Thus, various achiral luminophores were endowed with CPL upon coupling with chiral ZIFs, which significantly deepened and enlarged the research scope of the chiroptical materials in a solid state.