Carbon dot-based nanocomposite: Long-lived thermally activated delayed fluorescence for lifetime thermal sensing

Zinc Donor–Acceptor Schiff Base Complexes as Thermally Activated Delayed Fluorescence Emitters

“…Although optical temperature sensing with the help of TADF emitters was demonstrated a while ago [29,30], only recently have molecular thermometers on their basis attracted significant attention. Sensors utilizing TADF-emitting carbon dot-based nanocomposite [31], polymers based on 1,8-naphthalimide [32], anthraquinone and dicyanobenzene -derived [33] organic dyes, as well as Pt(II), Pd(II) and Zn(II) complexes with benzoporphyrins [34,35] have been reported.…”

Multiemissive Room-Temperature Phosphorescent Carbon Dots@ZnAl2O4 Composites by Inorganic Defect Triplet-State Energy Transfer

“…Nonetheless, traditional phosphorescent materials suffer from the following disadvantages: (i) upscaling of raw materials, (ii) complicated preparation and purification procedures, and (iii) exacting requirements on afterglow such as in a crystalline state as well as in a bulk form and rare to observe afterglow in aqueous solution and an oxygen atmosphere. − Recently, carbon dots (CDs), a novel member of nanoluminescent materials with unique optical properties, excellent biocompatibility, and easy preparation, have become efficient alternatives to traditional phosphorescent materials and overcome many of the drawbacks. Significantly, CDs were embedded into various materials to obtain CDs-based RTP materials through structural confinement and chemical bonding (coordination, − covalent bonding, − and hydrogen bonds , between the rigid matrix and interior CDs. Specifically, the direct in situ incorporation of photoluminescent (PL) materials into inorganic materials requires a strong driving force between the coassembly of guest luminescent species and host inorganic matrices .…”

Construction and Multifunctional Applications of Visible-Light-Excited Multicolor Long Afterglow Carbon Dots/Boron Oxide Composites

“…24−26 However, the TADF and RTP characteristics of CDs are rarely reported. It was recently reported that incorporating CDs into zeolites, 27,28 organic polymer, 29,30 layered double hydroxides, 31,32 urea/biuret, 33,34 and silica 35,36 could produce TADF or RTP emission. Unfortunately, most of the constructed CD composite systems cannot produce RTP and TADF emissions at the same time.…”

“…Carbon dots (CDs), a rising star in the carbon material family, have been showing wide applications in diverse fields such as fluorescence sensing, bioimaging, energy conversion, and storage because of their outstanding electronics and optical properties. − Recently, researchers have prepared a variety of CD oxide composites (for instance, CDs/TiO 2 , CDs/Fe 3 O 4 , CDs/MnO 2 ) that can effectively improve the catalytic performance. − However, the TADF and RTP characteristics of CDs are rarely reported. It was recently reported that incorporating CDs into zeolites, , organic polymer, , layered double hydroxides, , urea/biuret, , and silica , could produce TADF or RTP emission. Unfortunately, most of the constructed CD composite systems cannot produce RTP and TADF emissions at the same time. ,,,− Meanwhile, most reported CD-based afterglow materials can be excited only under ultraviolet light, − which significantly limits their further applications.…”

“…It was recently reported that incorporating CDs into zeolites, , organic polymer, , layered double hydroxides, , urea/biuret, , and silica , could produce TADF or RTP emission. Unfortunately, most of the constructed CD composite systems cannot produce RTP and TADF emissions at the same time. ,,,− Meanwhile, most reported CD-based afterglow materials can be excited only under ultraviolet light, − which significantly limits their further applications. As we know, visible light with less phototoxicity and higher safety can penetrate tissues much deeper compared with ultraviolet light, which has shown an attractive application, − and it is easy for the probe with dual emission to perform ratiometric sensing.…”