Reevaluation of absolute luminescence quantum yields of standard solutions using a spectrometer with an integrating sphere and a back-thinned CCD detector

Abstract

We reevaluate the absolute fluorescence and phosphorescence quantum yields of standard solutions by using a novel instrument developed for measuring the absolute emission quantum yields of solutions. The instrument consists of an integrating sphere equipped with a monochromatized Xe arc lamp as the light source and a multichannel spectrometer. By using a back-thinned CCD (BT-CCD) as the detector, the sensitivity for spectral detection in both the short and long wavelength regions is greatly improved compared with that of an optical detection system that uses a conventional photodetector. Using this instrument, we reevaluate the absolute fluorescence quantum yields (Phi(f)) of some commonly used fluorescence standard solutions by taking into account the effect of reabsorption/reemission. The value of Phi(f) for 5 x 10(-3) M quinine bisulfate in 1 N H(2)SO(4) is measured to be 0.52, which is in good agreement with the value (0.508) obtained by Melhuish by using a modified Vavilov method. In contrast, the value of Phi(f) for 1.0 x 10(-5) M quinine bisulfate in 1 N H(2)SO(4), which is one of the most commonly used standards in quantum yield measurements based on the relative method, is measured to be 0.60. This value is significantly larger than Melhuish's value (0.546), which was estimated by extrapolating the value of Phi(f) for 5 x 10(-3) M quinine bisulfate solution to infinite dilution using the self-quenching constant. The fluorescence quantum yield of 9,10-diphenylanthracene in cyclohexane is measured to be 0.97. This system can also be used to determine the phosphorescence quantum yields (Phi(p)) of metal complexes that emit phosphorescence in the near-infrared region: the values of Phi(p) for [Ru(bpy)(3)](2+) (bpy = 2,2'-bipyridine) are estimated to be 0.063 in water and 0.095 in acetonitrile under deaerated conditions at 298 K, while that in aerated water, which is frequently used as a luminescent reference in biological studies, is reevaluated to be 0.040.

Strong room-temperature blue-violet photoluminescence of multiferroic BaMnF4

“…Till now, the supposed self-absorption has been conformed rationally. Self-absorption is a common case for solid luminescent 7 materials, and has been researched for many years [31,[33][34][35][36][37]. In some solid state, physical phenomena such as multiple scattering and self-absorption of the emitted light may occur, leading to the distortion or split of the luminescence features, thus compromising the data interpretation [31,38].…”

Synthesis and Fluorescence Quantum Yield of Gd<sub>1－x</sub>Eu<sub>x</sub>OOH Crystals

“…The excitation spectra were corrected for the spectral distribution of the lamp intensity by the Rhodamine B method, and the emission spectra were corrected for the spectral response of the instrument by using a substandard light source. The Φ f values were measured using an absolute photoluminescence quantum yield measurement system (Hamamatsu, C9920-02), at room temperature [7].…”

“…Although this compound can function as a host material for phosphors, there are very few reports on its photoluminescence properties [5] [6]. Fluorescence quantum yield, Φ f , which is defined as the ratio of the number of emitted photons to the number of absorbed photons, is a fundamental parameter that decides the photoluminescence efficiency of a compound/phosphor [7]. Hence, evaluation of the activator content dependence of Φ f using high-quality single-crystal specimens is important.…”

Luminescence Properties of Anthracene Chromophores in Cyclosiloxane-Based Hybrid Polymer Films

“…Compared with the fluorescence spectrum of TMCS-DTMS-An hybrid polymer film in the previous report, 13 no emission band appears at 390 nm, which corresponds to 0-0 band transition. This is because of the reabsorption 14 of anthracene chromophores in the TMCS-DTMS-An hybrid polymer film. Usually anthracene excimer is observed with broad structureless emission band at high concentration, however, the luminescence spectrum has no remarkable broad emission band at longer wavelength region.…”