Journal
SCIENCE CHINA-CHEMISTRY
Volume 65, Issue 11, Pages 2274-2282Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-022-1346-6
Keywords
carbon dots; dual-sensitivity; full color emission; spiropyran; Forster resonance energy transfer
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Funding
- National Natural Science Foundation of China [52122308, 21905253, 51973200, 52103239]
- Natural Science Foundation of Henan [202300410372]
- Henan Postdoctoral Foundation
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Dodd-Walls Centre for Photonic and Quantum Technologies
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In this study, multicolor phosphors with rapid response to UV/visible light and pH were synthesized. The fluorescence properties of these phosphors could be dynamically regulated on the timescale of minutes, making them potentially useful for applications in UV and pH sensing.
Multicolor phosphors that respond rapidly to external stimuli are highly desirable for many applications, including lighting, optical displays and sensors. Herein, spiropyran (SP)-functionalized carbon dots (CDs) were synthesized with a broad-spectrum output that were responsive to both ultraviolet (UV)/visible light and pH. The SP-CDs possessed strong ester linkages between the UV-absorbing/blue-emitting CDs and blue-absorbing/red-emitting surface SP groups, allowing efficient Forster resonance energy transfer (FRET) between the donor and acceptor. UV irradiation or acid addition cause the SP ring opening to merocyanine (MC) or protonated MCH+ forms, respectively, together with the formation of sheet-like aggregates. These processes enhanced the red emissions by the SP groups and attenuated blue emissions from the CDs. These changes were fully reversible under visible light or basic conditions, respectively, allowing dynamic regulation of the fluorescence properties (emission colors from blue to red, photoluminescence (PL) intensity) under photoirradiation on the timescale of minutes. As proof-of concept, we demonstrate that the emission properties of the SP-CDs can be used to construct UV and pH sensing materials as well as light emitting diode (LED) with different colors.
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