A number of photophysical properties of 5H-dibenzo(a,d)cyclohepten-5-one ha
ve been measured for the first time including the prompt and P-type delayed
fluorescence, and triplet-triplet absorption. Decay parameters, for the tr
iplet-state of this molecule, have also been measured in different quenchin
g conditions. The results are discussed and compared for those of similar m
olecules. (C) 2000 Elsevier Science B.V. All rights reserved.