Microwave Assisted Encapsulation of Chiral Carbon Nanodots in Metal-Organic Framework Film for Broadband Excited Circularly Polarized Luminescence

Abstract

Developing high circularly polarized luminescence (CPL) with broadband excitation wavelengths is important in practical applications but is still challenging. Herein, the example combining chiral carbon nanodots (cCND) and metal-organic framework (MOF) film is reported for achieving broadband excited CPL with UV–vis light excitation. The stable Zr-MOF containing perylene-based ligand with broadband excitation is prepared by using the vapor-assisted conversion method, and then is loaded with chiral precursors and microwave-treated to obtain cCND loaded MOF (cCND@MOF) films. The resulted host-guest film not only in situ encapsulates uniform sized cCND into MOF film with microwave treatment, but also avoids the aggregation-caused quenching effect of cCND and enhances the chiral/energy transfer from perylene based MOF film for achieving intense luminescence and high CPL with broadband excitation wavelengths from UV to visible region, and increased the g_lum to 10⁻². This study provides an efficient and convenient microwave-assisted method for constructing host-guest materials by loading cCND into MOFs, and develops broadband excited CPL film materials.