Figure 1| The design and preparation of the CDs-based OLPL blend. (IMAGE)
Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS
a, A possible LPL mechanism: during photo-excitation, electrons (black dots) are continuously generated and filled into the LUMO orbits (path i); in the blends of CDs and matrix, electrons transferred from the HOMO of the donor to the HOMO of the acceptor to form charge-transfer (CT) states (path ii); the acceptor radical anions diffuse to isolate the donor radical cations from the acceptor radical anions, forming charge-separated states (CSS) (path iii); gradual recombination of the radical anions and radical cations (path iv) to generate long persistent exciplex emission, i.e., electron transition from the LUMO of the acceptor to the HOMO of the donor (path v). The small energy gaps between the lowest singlet excited state of exciplex (S1*) and S1/T1 of CDs enable RISC and ISC, resulting in multiple LPL emissive processes. b, Schematic illustration of the preparation process of m-CDs@CA and the conversion from urea to CA. c, The high-resolution TEM image of m-CDs@CA. d, The XRD patterns of m-CDs, pCA, eCA and m-CDs@CA. e, FT-IR spectra of m-CDs, CA and m-CDs@CA. f, High resolution XPS spectra and the corresponding fitting curves of N1s of the CA, m-CDs and m-CDs@CA.
by Kai Jiang, Yuci Wang, Cunjian Lin, Licheng Zheng, Jiaren Du, Yixi Zhuang, Rongjun Xie, Zhongjun Li, and Hengwei Lin
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