Carbon Dots Promote the Performance of Anodized Nickel Passivation Film on Ethanol Oxidation by Enhancing Oxidation of the Intermediate<sup>†</sup>

Comprehensive Summary Solid‐state fluorescent multi‐color carbon dots (SFM‐CDs), prepared using the same precursor(s) without the need for dispersion in a solid matrix, are highly demanded for a wide range of applications. Herein, we report a microwave‐assisted strategy for the preparation of SFM‐CDs with blue, yellow and red emissions within 5 min from the same precursors. The as‐prepared B‐CDs, Y‐CDs, and R‐CDs possessed bright fluorescence at 425 nm, 550 nm, and 640 nm, and photoluminescence quantum yields (PLQYs) of 54.68%, 17.93%, and 2.88%, respectively. The structure of SFM‐CDs consisted of 5‐oxo‐3,5‐dihydro‐2H‐thiazolo [3,2‐a] pyridine‐7‐carboxylic acid (TPCA) immobilized on the surface of a carbon core, with the size of the carbon core and degree of disulfide crosslinking between CDs both increasing on going from the B‐CDs to the R‐CDs, as verified by mechanochromic experiments. The excellent solid‐state fluorescence performance of the SFM‐CDs allowed their utilization as the fluorescent converter layer in multi‐color LEDs and white LEDs with a high color rendering index.

Section: Background and Originality Contentmentioning

confidence: 99%

Disulfide Crosslinking‐Induced Aggregation: Towards Solid‐State Fluorescent Carbon Dots with Vastly Different Emission Colors^†

Song

Liu

et al. 2023

“…As a novel class of zero‐dimensional fluorescent carbon‐based nanomaterial, carbon dots (CDs) have attracted much attention since first reported in 2004. [ 1 ] Currently, CDs are widely applied in bio‐imaging, [ 2‐3 ] tumor therapy, [ 4 ] sensing, [ 5 ] catalysis, [ 6 ] and optoelectronic devices [ 7 ] owing to their unique properties including tunable photoluminescence, photobleaching resistance, low cost, ease of synthesis, excellent biocompatibility, etc . [ 8‐9 ] In particular, CDs exhibiting fluorescence in aggregated or solid state, are highly desirable for LEDs devices application.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Polythiophene Derivatives Carbonized Polymer Dots: Aggregation Induced Solid‐State Fluorescence Emission^†

Zhao

Nan

et al. 2023

Comprehensive Summary Currently, solid‐state fluorescent carbonized polymer dots (CPDs) have attracted attention increasingly due to their applications for optoelectronic display. However, designing CPDs possessing solid‐state fluorescence and clarifying the fluorescence mechanism remain challenging. Herein, we initially synthesized a novel type of polythiophene derivatives CPDs, poly‐4,4’‐(thiophene‐3,4‐diyl)dibenzoic acid carbonized polymer dots (PDBA‐CPDs) with solid‐state fluorescence. Subsequently, the structural and optical characterization revealed that the solid‐state fluorescence originated from the aggregation induced emission of the CPDs. In brief, in aggregation state, the remaining polymer structure groups on the surface of the CPDs overlapped and weakened the non‐radiative transition, enhancing solid‐state fluorescence emission. Thirdly, three polythiophene‐derived CPDs were designed to further demonstrate the aggregation induced solid‐state fluorescence mechanism. Finally, owing to their unique properties of solid‐state fluorescence, the white LEDs (light emitting diodes) were fabricated with high color rendering index (CRI) of 82.7 and CIE coordinates of (0.37, 0.39) using commercial 460 nm chip. This work facilitates the development of CPDs’ solid‐state fluorescence mechanisms and advances the application of CPDs in the field of optoelectronics.

“…[ 7‐8 ] Therefore, innovative strategies were employed to improve the photocatalytic activity of materials to produce oxygen effectively. [ 9‐13 ] Various synthesis methods including supported cocatalysts were also explored to improve the photocatalytic performance of semiconductor photocatalyst. [ 14‐18 ]…”

Section: Background and Originality Contentmentioning

confidence: 99%

Enhancement of the Photocatalytic Oxygen Production by Tantalum Nitride Supported Fe Atom Embedded N‐Doped Graphene Oxide^†

Liu

Zhu

et al. 2022

Comprehensive Summary Energy crises and environmental pollution have become urgent problems with human civilization development. Photocatalysis technology is a green method to deal with these challenges. The key to improve photocatalytic efficiency lies in the effective separation of photogenerated electron–hole pairs. In this work, we designed the Fe atom embedded N‐doped graphene oxide (Fe‐NGO) supporting on tantalum nitride (Ta3N5) catalyst, which was employed to improve the photocatalytic oxygen production activity. The oxygen production of 5 wt% Fe atom embedded N‐doped graphene oxide supporting on tantalum nitride (Fe‐NGO/Ta3N5) was 184.7 μmol·g−1, about 3.5 times higher than that of the pure Ta3N5. The introduction of the cocatalyst Fe‐NGO acting as an electron conductor in the Fe‐NGO/Ta3N5 accelerates the carrier migration of Ta3N5 and further enhances the photocatalytic oxygen production activity. N‐doping increases the conductivity of graphene oxide (GO), and Fe atoms are used as the reactive sites to promote the combination of electron and sacrificial agent in the system. This work may provide insights into the research of new carbon cocatalyst materials.