Clusterization-triggered emission: Uncommon luminescence from common materials

Abstract

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A clustering-triggered emission strategy for tunable multicolor persistent phosphorescence

“…S5, ESI †), 43,50 considering the formation of different oxygen clusters and conformation rigidication. 43,50,[53][54][55] Furthermore, the presence of diverse oxygen clusters was also validated by looking at the various lifetimes at different maxima ( Fig. S6 and Table S2, ESI †).…”

“…They are ready to form crystals comprising oxygen clusters, which would also allow access to structural diversity through electronic communications. [53][54][55] Furthermore, multiple hydrogen bonds are benecial for the formation of oxygen clusters with rigid conformations. 51,52 Fortunately, even without any p segments, all the crystals demonstrated tunable multicolor p-RTP and more obvious tunability was achieved for them and their concentrated solutions at 77 K, thus conrming the speculation.…”

Aggregate Science: From Structures to Properties

“…[188][189][190][191][192][193][194][195][196][197][198] Clusteroluminogens, including nonconjugated polymers, small molecules and metal clusters, are often nonluminescent as molecular species. [199] As shown in Figure 11A, the isolated molecules possess a large energy gap (∆E 1 ) due to the lack of through-bond conjugation resulting in ∆E 1 always corresponding to an ultraviolet emission that is weak in intensity, and invisible in wavelength to the eye, and may even be below the detection limit of spectrophotometers. [200] However, once clusters form in the aggregate state, the energy gap (∆E 2 and ∆E 3 ) become narrow because of the newly generated throughspace conjugation.…”

Thermally activated triplet exciton release for highly efficient tri-mode organic afterglow

“…19) were also investigated at 77 K. The DCzB-doped PMMA film shows both fluorescence (475 nm, 4.4 ns) and phosphorescence (495 nm, 381 ms), suggesting that the afterglow peaks of 475 and 495 nm in crystal can be ascribed to the radiative decays of S 1 and T 1 of the isolated single molecules, respectively. The emission peak of 525 nm is undetectable in the doped film, since the T 1 * emission is related to the molecular aggregations 5,31 . In DCzB crystal, owing to the suppressed nonradiative relaxation at low temperatures, all the emission bands are enhanced and the OURTP peaks become observable in the steady-state PL spectrum and the lifetime was elongated to 1.0 s at 77 K ( Supplementary Figs.…”