Fluorescence of Europium Thenoyltrifluoroacetonate. II. Determination of Absolute Quantum Efficiency

Abstract

The absolute quantum efficiency of the fluorescence of europium thenoyltrifluoroacetonate in acetone has been measured by a calorimetric method, and substantiated by comparing the output against that from acridone. The quantum efficiency of the fluorescence, which peaks at 6122 Å, from acetone solutions at 25°C is 0.56±0.08.

Interpretation of europium(III) spectra

“…It is also possible to determine the absolute quantum yield measurement of the heat dissipation by non-radiative deactivation. Gudmundsen and coworkers determined the absolute quantum efficiency of the europium(III) 2-thenoyltrifluoroacetonate complex [Eu(tta) 3 ] in acetone by a calorimetric method [774]. By this technique the temperature rise of the samples due to non-radiative deactivation is measured.…”

Accuracy in spectrophotometry and luminescence measurements

“…is also essentially a power measuring apparatus, and its factor of merit is given by the NEP, which is related to the NET of the temperature sensor, as follows: NEP = NET{C p )t- (11) where r is the time constant of the temperature de- Seybold,Gouterman,and Callis [29] and by Gudmundson et al [119]. In these devices one attempts to eliminate heat transfer between the calorimeter and its surroundings.…”

“…[137][138][139][140][141][142][143][144][145][146][147][148][149][150][173][174][175][185][186][187][188][189][190][231][232][233] in spectrophotometry, 2,3,31,35,84,95,112,114,119,126,130 Actinometers, 144,[160][161][162][163][164][165][166] Amino acids assay, 227 automation in, 228…”

“…Recording spectrophotometer, [8][9][10][11] Reflectance, [9][10][11][12][13][14][26][27][28]111 Reflection errors, 86,87,97,98,111 Rhodamine 146-150,155,188-190,192-193,219,239-241 solids, 155,206-216,219,241-242 spectrophotometry liquids, [95][96][97][98][99][100][101][102][103][104][105][106][107][108]122 solids, 3,25,26,45-49,132,133,135,136 spectroradiometry, [54][55][56][57][58][59] Stray radiations, 18,19,42,88,89,[96][97][98]112,119,…”

Laser Action in Fluorinated Europium Chelates in Acetonitrile

“…The emission lifetime is decreased but not enought to account for the observed quenching 7. This assumption is not correct at high quencher concentration.…”