An ultralong room-temperature phosphorescent material based on the combination of small singlet–triplet splitting energy and H-aggregation

Abstract

Compound AI-N-Cz exhibited ultralong RTP with a lifetime of 775 ms due to the combination of small ΔEST and H-aggregation.

Halogenation of a twisted non-polar π-system as a tool to modulate phosphorescence at room temperature

“…35 Halogenation of such systems has been shown to be a versatile tool to control lifetime and quantum yield (Φ). 23,30,31 Recently, alternative strategies to induce RTP and enhance its efficiency were investigated, including molecular aggregation, 16,27,36 energy-gap narrowing 37,38 and twisting of the π-system. 39 In order to elucidate these aspects, we investigated our recently discovered twisted hydrocarbon homotruxene (HTX) 39 through the introduction of three new triply halogenated homologs HTX-F, HTX-Cl, and HTX-Br (Fig.…”

Switching between TADF and RTP: anion-regulated photoluminescence in organic salts and co-crystals

“…The delayed luminescence of the pyridinium compounds (Py-BF 4 , Py-PF 6 , Py-Cl) shares the same trend as seen in the steady-state View Article Online emission, in which a red-shift from non-coordinating PF 6 À to coordinating Cl À is observed. All four compounds (Py-BF 4 , Py-PF 6 , Py-Cl and Qui-BF 4 ) display long-lived lifetimes (longer than milliseconds) [34][35][36][37] with visually observable afterglows that can be captured by a digital single-lens reflex (DSLR) camera, which is a characteristic feature of RTP (Fig. 5).…”

Room Temperature Phosphorescence Emission From Multi-States

“…In recent years, various strategies have been utilized to achieve RTP luminogens; for example, the introduction of heavy atom or aromatic carbonyl can effectively boost the spin-orbit coupling (SOC) constant and then facilitate the intersystem crossing (ISC) rates between the excited singlet (S 1 ) and triplet states (T n ), which is one of the most widely used strategy (Zhao et al, 2020;Zhang et al, 2021). Besides, host-guest doping (Notsuka et al, 2017;Qu et al, 2019;Lei et al, 2020;Guo et al, 2021), crystallization (Yuan et al, 2010;Gong et al, 2015;Wu et al, 2019;Nitti et al, 2020), H-aggregation (An et al, 2015;Yuan et al, 2019;Zhang L. et al, 2020;Li et al, 2021), polymer skeleton (Wang et al, 2019a;Du et al, 2019;Gao and Ma, 2021;Meng et al, 2021;Yan et al, 2021;Zhang et al, 2021), and other methods (Baroncini et al, 2017;Li et al, 2019;Wen et al, 2019), which can strengthen the rigidity of the structure, were also proposed towards the high-efficiency of RTP.…”