Tunable Fluorescence and Room-Temperature Phosphorescence from Multiresponsive Pure Organic Copolymers

Stimuli-responsive polymers have received growing attention in the photochromic area of applied materials undoubtedly. It remains a great challenge to achieve multifunctional luminescence materials with a multitudinous stimuli response. Three color-convertible copolymers are obtained with the relative copolymerization of benzaldehyde, 2,5-dihydroxy terephthalate, spiropyran (SP), and acrylamide. The achieved solid powder could respond to light, temperature, as well as humidity upon the alternation of UV light and visible light irradiation. Multicolor conversions including white-light emission with CIE coordinates (0.33, 0.33) are also obtained reversibly owing to the photochromic nature of SP moiety. Furthermore, the energy transfers proposed in these photochromic copolymers are not limited to fluorescence energy transfer only, which are enriched by triplet energy transfer with long lifetimes. Corresponding properties and applications were also fully explored based on these copolymers.