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Achieving white light emission using melamine–formaldehyde microcapsules containing three fluorescence color-emitting conjugated polymers

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Abstract

Fluorescent conjugated polymers (CPs) emitting blue, green, and red were polymerized via the Suzuki coupling reaction. Their emissive monomer units were linked to a fluorene unit in the backbone and thus could be excited at the same wavelength to fluoresce their own emission colors. The resultant polymers were dissolved in dioctyl phthalate, which was embedded in melamine–formaldehyde microcapsules (MFMs). The CP-embedded MFMs maintained the red, green, and blue emission colors of the CPs. The three fluorescent MFMs were mixed in suitable amounts to fabricate white light-emitting MFMs under single-wavelength excitation. The microcapsule embedment could effectively avoid the unnecessary energy transfer from short- to long-wavelength emission, which is a crucial obstacle for white emission when using mixed colors. Thus, white light emission was successfully obtained using spatially separated MFMs in aqueous solution.

Graphical Abstract

White light emission was performed using spatially separated RGB conjugated polymers embedded in melamine-formaldehyde microcapsules.

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Acknowledgements

This work was supported by the National Research Foundation (NRF) grant funded by the Korean government (MSIT) (2020R1A5A8017671 and 2023R1A2C2006046).

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Author notes

  1. Seonyoung Jo

    Present address: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Korea

  2. Geun Tae Pak and Seonyoung Jo have equally contributed to this work.

Authors and Affiliations

  1. Organic and Optoelectronic Materials Laboratory, Department of Organic Materials Engineering, Chungnam National University, Daejeon, 34134, Korea

    Geun Tae Pak, Seonyoung Jo & Taek Seung Lee

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Contributions

GTP; methodology, formal analysis, writing—original draft preparation, SJ; validation, writing—review and editing, TSL; funding acquisition, project administration, conceptualization. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Taek Seung Lee.

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13233_2024_248_MOESM1_ESM.docx

Supplementary file1 (DOCX 630 KB) Experimental procedure for the preparation of synthetic methods for monomers and polymers, photographs, IR spectra, and size distribution of MFMs. The materials are available via the Internet at http://www.springer.com/13233. Supporting Information should be attached at the end of the article or separated file.

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Pak, G.T., Jo, S. & Lee, T.S. Achieving white light emission using melamine–formaldehyde microcapsules containing three fluorescence color-emitting conjugated polymers. Macromol. Res. 32, 597–603 (2024). https://doi.org/10.1007/s13233-024-00248-8

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