With 1,2-benzanthracene and fluoranthene population of higher excited singlet states S,, (n > 1) by triplet-triple1 annihilation is energetically possible. With both compounds a delayed fluorescence Sn + So from the highest accessible singlet state St1 was found (n = 3 for 1,2-benzanthracene and n =
Delayed fluorescence from upper excited singlet states of aromatic ketones
โ Scribed by Bernhard Nickel; Gabriele Roden
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 454 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
With hqwd _wlutlons of the aromstlc ketones anthraqumone and 'lamhone, a P-type delayed fluorescence from upper ewited smglet states, resultmg from tnplet-tnplet annihdation, has been obsened. Some peculurltles of the triplet-triplet annihilation of aromatlc ketones are dacussed.
๐ SIMILAR VOLUMES
Fluorcscencc spectra are presented, originstins from upper excited singlet stntcs in three santhene dyes. The cxpcrimentnl method, using biphoknic pulsed laser escitation, is shown to have advantages over sir&-photon ultraviolet irradiation. It is further shown that the observed spectra dcpcnd on th
The emission spectra of the second excited singlet state of [ 181 annukne and of monofluoro [ 181 annulene (m a 3methylpentanc glass at 4 K) are reported. The large ener,7 gap between the fist and second excited singlet states inhibits fast internal cogversion and favours the appearance of S2 + So e
Fluorescence has been observed from the second excited singkt stste of tkiophosgene vapour. The emission is excited mainly by transitions originating in the out-of-plane bending mode of the ground stzte and terminating in the lowest vibrational levekof the-excited state. i '.