Emission enhancement of a carbazole-based fluorophore on a quantum dot surface

Abstract

A novel carbazole-based fluorophore 5-(carbazol-9-yl)-5'-mercapto-2,2'-bithiophene (CBTSH) was synthesized. CBTSH exhibited emission enhancement when attached to the surface of CdSe quantum dots (QDs). The emission quantum yield of CBTSH attached to CdSe is almost 5 times larger than that of CBTSH alone. The emission enhancement of CBTSH on the CdSe surface is due to the restriction on the rotational and vibrational motions of the carbazolylbithienyl unit as a result of QD aggregation.

Highly Emissive Layers based on Organic/Inorganic Nanohybrids Using Aggregation Induced Emission Effect

“…Similar trends were observed with carbazole derivatives on various inorganic or metal nanocrystals. [19,20] However, to be used in optoelectronic devices as an emitting layer, such organic-inorganic nanohybrid materials should provide suitable transport properties together with their optical emission, and be able to form thin films with optical quality. We thus envisaged to achieve such properties by using AIE ligands synergistically combined with semiconducting nanoparticles.…”

A Smartphone‐Assisted Sensitive, Selective and Reversible Recognition of Copper Ions in an Aqueous Medium

“…In addition, the stoichiometry of the complex between the spiropyran derivative ( 1 ) and copper ion was determined using Job's plot method, which revealed that two molecules of spiropyran derivative ( 1 ) encapsulate one Cu 2+ ion (Figure ). However, in earlier reports, sulfur‐containing spiropyran derivative only displayed a 1 : 1 complex geometry with the metal ions …”

“…In earlier studies, a benzothiazolinic spiropyran derivative detected mercuric ion, which has a nitro group para to the oxygen atom of the phenolic group, while another benzothiazolnic spiropyran detected copper ions . Therefore, it may be concluded that the charge density of the oxygen atoms attached to the phenolic part also plays a crucial role in the determination of the selectivity towards metal ion . To investigate whether the color change is caused exclusively by copper ions, a solution of spiropyran derivative ( 1 ) was irradiated with 365 nm (100 W) or 254 nm (4 W) at 25 °C and 0 °C, which led to no observable change in the absorption band of the free receptor.…”

Spectral characteristics and fluorescence quenching of N,N′-bis(4-pyridyl)-3,4:9,10-perylenebis(dicarboximide) (BPPD)

“…(4) simplifies to Eq. (2) [47,48]; /ñS av is the average wavenumber corresponding to the 0-0 transition. The fluorescence lifetime can be calculated by using…”