Technique for the determination of absolute emission quantum yields of powdered samples
Technique for the determination of absolute emission quantum yields of powdered samples
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DOI：
10.1021/j100615a009
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发表时间：
1974-10
期刊：
影响因子：
--
通讯作者：
M. Wrighton;D. Ginley;D. Morse
中科院分区：
文献类型：
--
作者：
M. Wrighton;D. Ginley;D. Morse
描述了一种用常规扫描发射分光光度计测定粉末样品绝对发射量子产率的技术。该技术用于测定国家标准局荧光粉、水杨酸钠、四卤锰（II）配合物、ClRe (CO) 3（1,10 -菲罗啉）、Ru（2,2′-联吡啶）32+和Rh (I)和Ir (I)的双（二膦）配合物的发光产率。绝对发射率的测量包括(1)确定样品相对于激发波长处的非吸收标准的漫反射反射率，然后(2)测量相同条件下样品的发射。发射的量子产率则是发射的光子与来自样品和非吸收标准的漫反射光子数量之差的比值。唯一需要的校准是确定探测器在激发和发射波长处的相对响应。该技术的产率估计为±25%，并且通过与先前获得的phos-phors的产率进行比较，确定了该技术的有效性；通过获取粉末样品的逐点反射光谱；并证明了发光量子产率与样品吸收的入射光的比例无关。
A technique is described for the determination of absolute emission quantum yields of powdered samples using a conventional scanning emission spectrophotometer. The technique is applied to the determination of theluminescence yields of National Bureau of Standards phosphors, sodium salicylate, tetrahalomanganese (II) complexes, ClRe (CO) 3 (l, 10-phenanthroline), Ru (2, 2'-bipyridine) 32+, and bis (diphosphine) com-plexes of Rh (I) and Ir (I). Measurement of absolute emission yields involves (1) determining the diffuse re-flectance of the samplerelative to a nonabsorbing standard at the excitation wavelength, and then (2) mea-suring the emission of the sample under the same conditions. The quantum yield for emission is then the ratio of the emitted photons to the difference in the number of diffuse reflected photons from thesample and the nonabsorbing standard. The onlycalibration necessary is to determine the relative detector re-sponse at the excitation and emission wavelengths. The technique gives yields estimated to be±25%, and the validity of the technique has been established by comparison of yields previously obtained for phos-phors; by obtainingpoint-by-point reflectance spectra of powdered samples; and by demonstration that the luminescence quantum yields are independent of the fraction of incident light absorbed by the sample.