Fluorescence Spectral Characteristic of Blue Amber from Dominican Republic, Mexico and Myanmar
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摘要: 采用荧光光谱仪对多米尼加、墨西哥、缅甸三个产地蓝珀进行荧光光谱分析，旨在对比不同产地蓝珀的荧光光谱和发光特征。通过实验测试得到了蓝珀样品的光谱曲线及最佳激发光源、测试范围，分析了不同产地蓝珀的峰形、峰位及荧光强度与光谱平滑程度的关系。结果表明：不同产地蓝珀强荧光发射主要发生在可见光的蓝色区域。（1）多米尼加蓝珀的峰形为两个主峰及一个肩峰，分别位于450、474和507 nm附近，其中荧光为蓝色系列的多米尼加蓝珀两个主峰等高，荧光为蓝绿色系列的多米尼加蓝珀样品位于474 nm处主峰强度高于450 nm处；（2）墨西哥蓝珀的最佳激发光源不定，为一个多峰叠加的宽峰，主峰位于439 nm附近。但当样品荧光很强时出现两个分离峰，分别位于415、435 nm；（3）缅甸蓝珀的峰形和峰位与多米尼加蓝珀相似，主峰及肩峰分别位于450、475和508 nm附近，且450 nm主峰强度高于475 nm处，但荧光变弱时，最佳激发光源为399 nm，主峰位于433、451 nm；（4）不同产地蓝珀在相同光源照射条件下所呈现的荧光颜色及强度不同，所表现出的荧光光谱亦有差异。因此，蓝珀的荧光光谱可作为分析其荧光特征的研究手段之一。产生蓝色、蓝绿色荧光的原因，依据前人研究成果及本文的测试数据验证，发现主要是由芳香族化合物产生，初步推测为蒽、二萘嵌苯或其衍生物，不同产地蓝珀的荧光光谱存在差异，可能与引起荧光物质的相对含量及品种不同有关。Abstract: The blue ambers studied here are caused by the fluorescence, not the body colour. The purpose of using the fluorescence spectrophotometer to analyze the fluorescence spectra of blue ambers from Dominican Republic, Mexico and Myanmar is to contrast the fluorescence spectra and luminescence characteristics. Through experiments tests, the authors got spectra, the best excitation light source and the test range. The authors also analyzed the relationship between the shape, the peak position, the intensity and degree of smoothness of fluorescence spectra from different origins of blue ambers. The results are as follows:Strong fluorescence emission of blue ambers mainly occurred in the blue region of the visible spectrum range. The optimal excitation light of Dominican blue amber is 413 nm, with two main peak shapes and a shoulder peak, respectively located near 450, 474 and 507 nm.Two main peaks (450 and 474 nm) show equal height in samples, and the 450 nm peak is lower than the 470 nm in samples with green fluorescence. The optimal excitation light of Mexican blue amber is indeterminate, with a relatively lenient peak consisting of multi peak stacks. The main peak is located at 439 nm, but two peaks will appear in strong fluorescence, which are located at 415 and 435 nm respectively. The optimal excitation light of Myanmar blue amber is 413 nm, with its peak shape and peak position similar to those of Dominican amber. Its peaks are located at 450, 475 and 508 nm, and the 450 nm peak is higher than the 475 nm peak; but when the fluorescence becomes weak, the best excitation source changes to 399 nm and two main peaks change to 433 and 451 nm accordingly. Blue ambers from different localities show different fluorescent colours and intensities under the same light source and the fluorescence spectra are not the same, either. Blue and blue-green fluorescence are mainly produced by the aromatic compounds, and this conclusion is based on previous research results. The authors tentatively assume that they are anthracene, perylene or its derivatives. The reason for the differences in the fluorescence spectra of blue ambers from different origins may be related to the relative content and different varieties of the substances which induced fluorescence.
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Keywords:
- blue amber /
- fluorescence spectrum /
- Dominica /
- Mexico /
- Myanmar
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