There is an urgent need to develop a safe, unclonable comprehensive anti‐counterfeiting technology. The novel organic‐inorganic nanocomposite material CD‐LDH uses fluorescence and phosphorescence to achieve double verification. It is made into luminous ink to write anti‐fake marks of important documents. There is no obvious trace under the fluorescent lamp, while blue light emission under the ultraviolet lamp, and a long afterglow of 5 s after the ultraviolet lamp is turned off. The material can be widely used in the fields of information transmission and anti‐fake.
Counterfeiting has become increasingly serious in the information age. In terms of anti-counterfeiting, room temperature phosphorescence (RTP) materials have received great attention due to their long emission wavelength and lifetime,...
Solution-processed polycrystalline perovskites (PVKs)
have aroused
tremendous interest in the optoelectronic device field. However, the
inherent high-density defects in the polycrystalline hindered achieving
efficient and stable large-area PVK solar cells (PSCs). Although organic
molecules are already employed to passivate PVK defects, they are
insulating by nature, limiting the carrier transport. Here, we design
an assembly of a small molecule (N,N′-di(propanoic acid)-perylene-3,4,9,10-tetracarboxylic diamide,
PDI) via confinement-assisted supramolecular polymerization technology,
which is used as a binder for grain boundaries to simultaneously passivate
defects and promote carrier transport. The synergistic effect allows
the efficiency of all-air processed carbon-based PSCs to reach a decent
power conversion efficiency of 14.17%. Importantly, the as-prepared
supramolecular assembly completely breaks through the insulating nature
of the single molecule, which exists in the long-term defect passivation
of PSCs by organic molecules. It is expected that this finding may
provide novel design ideas to apply the assemblies to improve the
performance of PSCs.
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