A new instrument intended for the measurement of relative fluorescence quantum yields is described. This instrument incorporates an integrating sphere to eliminate corrections due to polarization and to index of refraction phenomena. The primary standard was quinine bisulphate in 1'N H2SO4. Quantum
The quantum yield of fluorescence of quinine bisulphate, azulene and 9,10-diphenylanthracene
โ Scribed by B. Gelernt; A. Findeisen; A. Stein; D. Moore; J.A. Poole
- Publisher
- Elsevier Science
- Year
- 1976
- Weight
- 82 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0047-2670
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The lifetimes of 9,10\_diphenylantllracenein dilute solutions ol cyclotexane and benzene at 25ยฐC have been found to k 7.58 2 0.04 and 6.95 \* 0.04 ns respccrively. hleasuwmcnts of the relative quanrun yields>how that the dependenca ': \_: on the solvent is caused by an incseased piobnbility for rmnk
The quantum yield ratio r=& +&+ . , ofthe &-So and +S, fluorescences from azulene has been redetermined. With azulene in isopentane at 190 K, r=455 & 100. This value agrees with the lower limit, given by Huppert, Jortner and Rentzepis, but is an order of magnitude lower than that given by Gillispie