Electrospinning Machine| Electrospun perovskite quantum dots-based Janus microribbons film with white light and multicolor luminescence for optical data storage and anti-counterfeiting

To achieve white light or multicolor luminescence from perovskite quantum dots (PQDs), a common method is direct mixing of PQDs with different halogen anions. However, this leads to uncontrolled ion exchange between PQDs, causing unpredictable fluorescence color changes. Thus, the key strategy for efficient and designable multicolor luminescence is spatially confining different PQDs in isolated regions to prevent halogen anion exchange.

Recently, Prof. Dong Xiangting’s team at Changchun University of Science and Technology published their work "Electrospun perovskite quantum dots-based Janus microribbons film with white light and multicolor luminescence for optical data storage and anti-counterfeiting" in Journal of Colloid and Interface Science. They synthesized PQDs-based Janus microribbons film (Janus-MRF) via parallel electrospinning, enabling white light and multicolor fluorescence under multi-wavelength stimulation. The Janus microribbon, as the structural unit of Janus-MRF, consists of [CsPbCl₁.₅Br₁.₅/Eu(BA)₃phen/PS]//[CsPbBr₃/Eu(BA)₃phen/PS] (BA: benzoate; phen: 1,10-phenanthroline; PS: polystyrene), where CsPbCl₁.₅Br₁.₅ and CsPbBr₃ PQDs emit blue and green fluorescence, respectively, while Eu(BA)₃phen provides red emission.Figure 1 illustrates the synthesis of PQDs, spinning solutions I/II, and the fabrication mechanism of Janus microribbons and Janus-MRF. The design and manufacturing process offer novel strategies for PQDs-based materials.

Fig. 1: (a) PQDs and (b) spinning solutions I/II synthesis; (c) Janus microribbons and Janus-MRF fabrication mechanism.

The Janus-MRF exhibits well-defined microribbon morphology, with two isolated micro-regions confining CsPbCl₁.₅Br₁.₅ and CsPbBr₃ PQDs separately, preventing halogen anion exchange and enabling stronger, tunable macroscopic fluorescence (Figure 2).

Fig. 2: (a) SEM image of Janus-MRF; (b) EDS line-scan, (c) optical microscope, and (d) fluorescence microscope images of Janus microribbons.

Due to distinct excitation wavelengths of PQDs and Eu(BA)₃phen, Janus-MRF achieves white light and multicolor emission under multi-wavelength stimulation (Figure 3). Fluorescence comparisons confirm that Janus microribbons avoid uncontrolled color shifts caused by ion exchange, demonstrating superior structural and optical properties (Figure 4).The flexibility, white light emission, and multicolor luminescence of Janus-MRF enable advanced anti-counterfeiting and white LED applications (Figure 5). 

Fig. 3: (a–c) Fluorescence spectra and (b–f) CIE coordinates of Janus-MRF with varying CsPbBr₃ PQDs content under 350/370/400 nm excitation.

Fig. 4: (a–c) Fluorescence spectra and (b–f) CIE coordinates of Janus-MRF vs. controls under multi-wavelength excitation.

Fig. 5: Custom-shaped, flexible Janus-MRF under 350/370/400 nm excitation.

 Additionally, identifiable fluorescence spectra under multi-wavelength stimulation and temperature-sensitive color changes allow sub-barcode generation, integrated into a large photonic barcode library (Figure 6), facilitating high-capacity data storage and anti-counterfeiting.

Fig. 6: Photonic barcode application schematic.

Hu Xintong, a Ph.D. candidate, is the first author. The design and preparation technology are significant for developing novel PQDs materials, with potential applications in anti-counterfeiting, lighting, data storage, and displays.

Paper link: https://doi.org/10.1016/j.jcis.2025.138276