Full‐Color Long‐Lived Room Temperature Phosphorescence in Aqueous Environment

Zheng, Yan; Zhou, Qian; Yang, Yan; Chen, Xiaohong; Wang, Chang; Zheng, Xian; Liang, Gengchiau; Yang, Chaolong

doi:10.1002/smll.202201223

Cited by 83 publications

(95 citation statements)

References 53 publications

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“…Fabrication of Optical Label: The slightly milled silica/C membrane, afterglow CDs prepared through the previous work, [35] and CNC powders were loaded into a 3D printed mold (50 mm × 15 mm × 1.5 mm) to form different numbers. The afterglow CDs, CNC powder, and silica/C material correspond to the first (8)/fifth (4), second (4)/fourth (8), and third (2)/six (7) number (from left to right), respectively.…”

Section: Methodsmentioning

confidence: 99%

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

Shi

Zhao

Zhang

et al. 2022

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Optical encryption technologies are widely used in information security, whereas the technology with one single optical secret key can be easily cracked. Here, a triple encryption is reported, which hides patterned information in excitation‐dependent allochroic materials with long afterglow, enhancing the security level. The allochroic materials are based on a uniaxial co‐assembly structure of cellulose nanocrystals (CNCs) and silica. The assembled CNCs present blue emission with quantum yield of 19.8% under 367 nm UV radiation. The blue emission is maintained in the inverse structure when CNCs are calcinated and converted to carbon dots (CDs). The inverse uniaxial‐assembly structure improves the CD emission by 6.7 times. The assembly structure can even improve the phosphorescence of CDs, leading to excellent excitation‐dependent allochroic properties. Specifically, the materials maintain a cyan long afterglow luminescence at 480 nm after removing 365 nm UV light, whose lifetime is 0.492 s. Changing the excitation wavelength to 254 nm, a UV emission at 343 nm can be obtained, alongside a blue long afterglow luminescence of 420 nm, whose lifetime is 1.574 s. Combining with blue afterglow materials, optical encryption labels are prepared, which hide different patterned information in three scenarios: natural light, UV light, and afterglow luminescence.

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Section: Methodsmentioning

confidence: 99%

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

Shi

Zhao

Zhang

et al. 2022

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“…RTP materials can maintain lifetimes of several milliseconds to seconds after removing excitation sources, which has promising prospects in applications of biological imaging, digital encryption, optoelectronic devices, and so on. [101][102][103][104] In general, phosphors are mainly based on metal-containing inorganic materials and organometallic complexes. Due to the advantages of sustainability and low toxicity, metal-free organic phosphors have attracted more attention in recent years.…”

Section: Room Temperature Phosphorescence (Rtp)mentioning

confidence: 99%

Conformational isomeric thermally activated delayed fluorescence (TADF) emitters: mechanism, applications, and perspectives

Shi

Wang

et al. 2023

Phys. Chem. Chem. Phys.

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“…Thus, the activation of long-lived RTP in the aqueous environment remains a tremendous challenge, and more attention has been drawn to establish self-protective RTP of C-dots. Current approaches to resolve this issue are the use of substances such as melamine, cyanuric acid, and n SiO 2 − to construct a rigid hydrogen bond network at the surface of C-dots. This network isolated the approach that energy transfers to oxygen, the enhanced RTP emission and prolonged RTP lifetime were therefore observed.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Three Carbon Dots with Various Lifetimes Rooted in Different Decarboxylation Degrees for Matrix-Free, Anti-Oxygen, and Time-Resolved Information Encryption and Cellular Imaging

Zou

Kong

et al. 2023

Anal. Chem.

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Activating long-lived room temperature phosphorescence (RTP) in the aqueous environment and thus realizing matrix-free, anti-oxygen, and time-resolved information encryption and cellular imaging remain a great challenge. Here, we fabricated three types of carbon dots (C-dots), i.e., fluorescent C-dots (F-C-dots) and two types of phosphorescent C-dots denoted as Pw-C-dots and Py-C-dots by a one-pot strategy. Their formation was attributed to the difference in the decarboxylation degree at high temperatures using trimesic acid (TMA) as a sole precursor. Unexpectedly, the yield reached as high as ∼92%, and the proportions were ∼27% for F-C-dots, ∼17% for Pw-C-dots, and ∼56% for Py-C-dots. These nanomaterials could help implement carbon peaking and carbon neutrality. Both green RTP of the two C-dots resulted from the small energy gap (ΔE ST). These two RTP C-dots had a long lifetime of over 270 ms with a relatively high quantum yield (4.5 and 6.2%). They exhibited excellent photostability and anti-photobleaching performances. The dry and wet powders of the RTP C-dots were applied to high-level information encryption. The lifelike patterns were greatly different from those of the original ones and could last for several seconds to the naked eye, demonstrating that the RTP C-dots could be potentially employed as anti-oxygen and time-resolved contrast reagents. Most significantly, the cellular imaging experiments showed that the biofriendly PVP-coated Py-C-dots could localize at lysosomes and sustain hundreds of milliseconds. This approach not only pioneers a time-resolved lysosome localization model but also opens up a promising door for anti-oxygen and time-resolved RTP cytoimaging.

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Full‐Color Long‐Lived Room Temperature Phosphorescence in Aqueous Environment

Cited by 83 publications

References 53 publications

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

Conformational isomeric thermally activated delayed fluorescence (TADF) emitters: mechanism, applications, and perspectives

One-Pot Three Carbon Dots with Various Lifetimes Rooted in Different Decarboxylation Degrees for Matrix-Free, Anti-Oxygen, and Time-Resolved Information Encryption and Cellular Imaging

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