The electrogenerated chemiluminescence of pyrene and some related compounds

Twisted configuration pyrene derivative: exhibiting pure blue monomer photoluminescence and electrogenerated chemiluminescence emissions in non-aqueous media

“…The two peaks with broad shapes in the ECL spectra of Bz-Py and Py correspond to the simultaneous monomer and excimer emissions, which are attributed to the fact that these two strongly p-conjugated planar molecules favor the formation of a large amount of the excimer in the excited state. 7 As observed in Fig. 3 and S-8, † more excimer emissions of Bz-Py and Py are evident in the ECL spectra when compared to the PL spectra obtained at the same concentration.…”

“…Pyrene is a possible ECL radical candidate because of its prominent photophysical properties, such as its remarkably long uorescence lifetime and high photoluminescence (PL) efficiency. 6 However, pyrene itself, with its intrinsic planar rigid structure and signicant p-orbital overlap, 7 has serious disadvantages for use as a blue luminophore due to its tendency to crystallize, conjugate or form extensive excimers, 8 resulting in unstable radical ions and a redshi of the emission peak to the green light-emitting region in an ECL process. 9 Therefore, searching for and designing modied pyrene derivatives to overcome these disadvantages is key to improving both the efficiency and color purity of blue ECL materials.…”

Circularly‐Polarized Electrochemiluminescence from a Chiral Bispyrene Organic Macrocycle

“…As expected, the main spectral feature was the excimer emission, as already observed in the PL, while the weak monomer contribution remained hidden under the broad excimer band. As already reported, monomeric pyrene gives only a very weak ECL signal …”

Electrogenerated chemiluminescence detection of single entities

“…The electrogenerated oxidant and reductant species, A˙ + and B˙ − , then react and produce excited states A* of the luminophore, which relax to the ground state to emit light. 45 A and B can be the same initial molecule, and then just the redox states are different. A − e → A˙ + B + e → B˙ − A˙ + + B˙ − → A* + B A* → A + hv …”