Abstract
Tuning of photophysical properties by conformational control with dual RT phosphorescence in metal-free organic emitters.
Highlights
Universidade Nova de Lisboa, 2829-516 Caparica, Portugal † Electronic supplementary information (ESI) available
These molecules were rationally designed based on the following considerations. (i) PTZ is a donor unit in many luminescent materials,[23,24,25,26] and emits phosphorescence at room temperature in solid zeonex films; (ii) DBT is a standard luminophore, usually serving as an electron donor in combination with acceptor units, e.g. fluorene,[27,28] anthracene,[29] or benzoyl.[30]
The DBT unit has been previously identified as promoting fast reverse ISC (RISC);[3] (iii) these four molecules are direct analogues of the dibenzothiophene-S,S-dioxide series which possess an unusual combination of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP).[32]
Summary
Universidade Nova de Lisboa, 2829-516 Caparica, Portugal † Electronic supplementary information (ESI) available. Similar bands are observed in the absorption spectra of the other substituted molecules, DPTZ–Me–DBT and DPTZ–tBu–DBT (Fig. S2, ESI†). The substituted molecules DPTZ–Me–DBT, DPTZ–iPr–DBT and DPTZ–tBu–DBT in the ground state exist only in the axial form, which is identified by the absorption at 380 nm.
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