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. 2020 Feb 18;11:944. doi: 10.1038/s41467-020-14792-1

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Network structure of multicomponent copolymer by radical cross-linking copolymerization. The brown line and blue and yellow hexagons represent PAA chains and various luminophores, respectively. b Excitation-dependent UOP of multi-component copolymer under ambient conditions. The polymer exhibits color-tunable UOP emission upon changes in the excitation wavelength. c Proposed mechanism of color-tunable UOP at room temperature. Multiple triplet excited state T₁ and T₁’ generating from different excited singlet states S₁ stem from the various luminophores through ISC. The rigid polymer microenvironment effectively restricts molecular motion for ultralong phosphorescence emission under ambient conditions.