The Categories of the UV-Vis Reflectance Spectra of Seawater Cultured Black Pearl and Its Unique PL Spectral Characteristics
YAN Jun1,2, SUN Qing2, YAN Xue-jun1, FANG Shi-bin1, SHENG Jia-wei2, ZHANG Jian2*
1. Zhejiang Fangyuan Test Group Co., Ltd., Hangzhou 310013, China
2. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Abstract：The spectral characteristics of seawater cultured black pearl were systematically investigated by ultraviolet-visible (UV-Vis) reflection spectrometer combining with photoluminescence (PL) spectrometer. The results show that: (1) based on the intensity and presence of the absorption peaks located at around 400, 500 and 700 nm in the UV-Vis reflection spectra, the black pearls were firstly classified into four categories. Namely, firstly, most of the pearls have absorption at around 400, 500 and 700 nm. Secondly, a small number of pearls have absorption peaks at around about 400 and 500 nm. Thirdly, partly of pearls absorption appeared peaks at about 400 and 700 nm. Finally, the rest of the pearls in this work appeared absorption peak around 500 and 700 nm. (2) Under the condition of 405 nm excitation light source and the room temperature, the unique characteristic absorption was located at around 620, 653 and 677 nm in PL spectra of black pearls, which did not appear in the other kinds of pearls. Interestingly, of which about 677 nm absorption peak had a sensitive to ultraviolet light, namely with the extension of irradiation time, the intensity of the absorption peak becomes weak or even disappears. In a word, the technology UV-Vis reflection combined with PL spectrum will take an important role in the identification of black pearls.
严 俊，孙 青，严雪俊，方诗彬，盛嘉伟，张 俭. 海水养殖黑色珍珠UV-Vis反射光谱的类型及其特异的PL光谱特征[J]. 光谱学与光谱分析, 2020, 40(09): 2781-2785.
YAN Jun, SUN Qing, YAN Xue-jun, FANG Shi-bin, SHENG Jia-wei, ZHANG Jian. The Categories of the UV-Vis Reflectance Spectra of Seawater Cultured Black Pearl and Its Unique PL Spectral Characteristics. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(09): 2781-2785.
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