Cellulose-Based Ultralong Room-Temperature Phosphorescence Nanomaterials with Tunable Color and High Quantum Yield via Nano-Surface Confining Effect

Cellulose-Based Ultralong Room-Temperature Phosphorescence Nanomaterials with Tunable Color and High Quantum Yield via Nano-Surface Confining Effect

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How to achieve multicolor organic room-temperature phosphorescence (RTP) is still challenging and striking.Herein, we discovered a new principle to construct eco-friendly color-tunable RTP nanomaterials based on the nano-surface confining effect.Cellulose nanocrystal (CNC) immobilized cellulose derivatives (CX) containing aromatic substituents via hydrogen-bonding interactions, which effectively inhibit the motion of cellulose chains and luminescent groups to suppress the nonradiative transitions.Meanwhile, CNC Reciever with a strong hydrogen-bonding network can isolate oxygen.CX with different aromatic substituents regulate the phosphorescent emission.

After mixing CNC and CX directly, 156 a series of polychromatic ultralong RTP nanomaterials were obtained.The RTP emission of the resultant CX@CNC can be finely adjusted through the introduction of various CX and the regulation of the CX/CNC ratio.Such a universal, facile, and effective strategy can be used to fabricate various colorful RTP materials with wide color gamut.Because of the complete biodegradability of cellulose, the multicolor phosphorescent CX@CNC nanomaterials can be used as eco-friendly security inks to fabricate disposable anticounterfeiting labels and information-storage patterns via conventional printing and writing processes.