Published March 25, 2019
| Version Accepted Manuscript
Journal article
Open
Persistent solid-state phosphorescence and delayed fluorescenceat room temperature from a twisted hydrocarbon
Authors/Creators
- 1. Universidade Federal de Santa Catarina 88040-900 Florianópolis, SC, Brazil
- 2. Centre de Recherche Paul Pascal, CNRS & Université de Bordeaux, 115, av. Schweitzer, 33600 Pessac, France
Description
The dehydrating cyclotrimerization of 1-tetralone in the presence of titanium tetrachloride at high temperature leads to homotruxene, a nonplanararene in which the twist angles between its three outer benzene rings and the central benzene are stabilized by ethylene bridges. This non-planar configuration allows for pronounced spin-orbit coupling and a high triplet energy, leading to room temperature phosphorescence in air with a lifetime of 0.38 s and a quantum yield of 5.6%, cleanly visible to the human eye after switch-off of excitation. Triplet-triplet annihilation is found to simultaneously lead to an intense delayed fluorescence, unprecedented from a pure hydrocarbon at ambient conditions, with a lifetime of 0.11 s.
Files
Salla Bock RTP+DF from a hydrocarbon HAL.pdf
Files
(1.6 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:58817b0643368060de4cc36fb39a7637
|
1.6 MB | Preview Download |