Journal
COORDINATION CHEMISTRY REVIEWS
Volume 254, Issue 21-22, Pages 2449-2458Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2010.04.006
Keywords
Emission quantum yield; Fluorescence; Phosphorescence; Ruthenium(II) tris(2,2 '-bipyridine) complex; Lanthanide complex; Anthracene; Absolute quantum yield measurement
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Funding
- Grants-in-Aid for Scientific Research [21550163] Funding Source: KAKEN
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The fluorescence and phosphorescence quantum yields (Phi) of standard solutions have been re-evaluated based on an absolute method using an integrating sphere equipped with a multichannel spectrometer. We have examined in detail the Phi value of ruthenium(II) tris(2,2'-bipyridine) complex which have been often used as the standards in the determination of quantum yields of transition-metal complexes. This revealed that the Phi values for [Ru(bpy)(3)](2+) were 0.063 in deaerated H2O, 0.040 in aerated H2O, 0.095 in deaerated CH3CN. and 0.018 in aerated CH3CN, respectively, which are significantly higher than the previously accepted values. We have also examined the technical aspects in the determination of absolute emission quantum yields for lanthanide complexes and those of organic crystals of anthracene. For the accurate determination for lanthanide complexes, special care must be taken in the spectroscopic measurements because of their narrow absorption and emission bands. For organic crystals, the fluorescence quantum yields are reduced due to reabsorption, chemical impurities and structural defects. Our observations for highly purified anthracene crystals revealed that the lower limit value of Phi was 0.64. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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