Room Temperature Phosphorescence in Solution from Thiophene-Bridged Triply Donor-Substituted Tristriazolotriazines.
Hugo Marchi LucianoGiliandro FariasCristian M SallaLarissa Gomes FrancaSuman KuilaAndrew P MonkmanFabien DurolaIvan Helmuth BecholdHarald BockHugo GallardoPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2023)
Most organic room-temperature phosphorescence (RTP) emitters do not show their RTP in solution. Here, we incorporated sulfur-containing thiophene bridges between the donor and acceptor moieties in D 3 A-type tristriazolotriazines (TTTs). The thiophene inclusion increased the spin-orbit coupling associated with the radiative T 1 →S 0 pathway, allowing RTP to be observed in solution for all compounds, likely assisted by protection of the emissive TTT-thiophene core from the environment by the bulky peripheral donors.