Measurement and Analysis of Diamond Fluorescent Emission Colourunder 365 nm Ultraviolet Excitation
-
摘要: 目前，对于长波紫外线下钻石荧光的颜色描述大多数采用肉眼观察，缺乏颜色定量分析。采用USB4000光纤光谱仪及365 nm的发光二极管作为紫外线光源测试了45颗天然无色—近无色钻石样品的荧光光谱数据，并结合色度学理论，获得其荧光颜色的色品坐标，将钻石的荧光颜色大致分为3类。在同样强度的365 nm紫外线激发下，结果显示：（1）钻石样品的蓝色荧光在饱和度和强度上均比其它颜色荧光的高，绿色荧光次之，其余荧光颜色微弱；（2）肉眼观察钻石样品的荧光呈现粉色和橙黄色时，其所测试数据在CIE色度图中的位置均位于蓝色区域，而肉眼观察为绿色荧光在CIE色度图中的位置在绿色区域；（3）蓝色荧光的亮度和饱和度均比较高，且荧光光谱的波峰位置基本相似，主波长分布于471～483 nm中并在CIE色度图中各点的位置相对紧凑，而绿色荧光的波峰不定，主波长分布于473～510 nm中并在CIE色度图中的位置比较分散。Abstract: Most gemmological descriptions on the colour of diamond fluorescence is based on observation by naked eye, and lacks of precise quantitative fluorescence colour determination.In this paper, the authors studied the ultraviolet fluorescence colour of natural near-colourless diamond samples by using USB4000 and light-emitting diode (LED) with 365 nm emission.The fluorescence spectra of 45 natural near-colourless diamonds were measured and analyzed by using theory of colorimetry in order to get the chromaticity coordinates and other related colorimetric parameters.From the calculation, the authors divided the fluorescent colour of diamonds into three categories.Under the same intensity of 365 nm ultraviolet excitation, blue fluorescence in both saturation and intensity are highest among other fluorescence colours.Under microscopic observation, fluorescence colour of diamonds showed blue, pink, yellow, but all calculated main hue still resided in a rather concentrated blue area (dominant wavelength:476-478 nm) in the CIE chromaticity diagram.However, dominant wavelength of the green fluorescence falls between 473-510 nm with a wide span.
-
Keywords:
- diamond /
- fluorescence colour /
- quantitative calculation /
- ultraviolet light
-
-
[1] Eaton-Magaña S, Breeding C M.An introduction to photoluminescence spectroscopy for diamond and its applications in gemology[J].Gem & Gemology, 2016, 52(1):15-27.
[2] Reinitz I M, Buerki P R, Shigley J E, et al.Identification of HPHT-treated yellow to green diamonds[J].Gem & Gemology, 2000, 36(2):128-137.
[3] King J M, Shigley J E.Characterization and grading of natural-color yellow diamond[J].Gem & Gemology, 2005, 41(2):88-115.
[4] Koivula J I, Fryer C W.Identifying gem-quality synthetic diamonds:An update[J].Gem & Gemology, 1984, 20(3):146-158.
[5] Moe K S, D'Haenensjohansson U, Wang W Y.LPHT-annealed pink CVD synthetic diamonds[J].Gem & Gemology, 2015, 51(2):6-8.
[6] Moe K S, Johnson P, D'Haenensjohansson U, et al.Largest blue HPHT synthetic diamond[J].Gem & Gemology, 2016, 52(1):23-24.
[7] 吕晓敏,张玉冰,兰延, 等.CVD合成钻石的层状生长结构和紫外荧光特征[J].宝石和宝石学杂志,2013,15(3):30-35. [8] 亓利剑,袁新强,罗永安, 等.查塔姆合成无色钻石[J].宝石和宝石学杂志,1999,1(4):7-10. [9] 王健行,陈美华,王礼胜.俄罗斯高温高压处理钻石特征[J].宝石和宝石学杂志,2010,12(3):5-9. [10] Luo Y, Breeding C M.Fluorescence produced by optical defects in diamond[J].Gem & Gemology, 2013, 49(2):7-21.
[11] 严俊, 刘晓波, 陶金波, 等.天然钻石与合成钻石的钻石观测仪鉴定特征研究[J].光学学报, 2015, 35(10):1-9. [12] 杨春,李慧娟, 王雅玫.山东蒙阴钻石的三维荧光光谱特征及其与紫外荧光特征的对比[J].宝石和宝石学杂志,2010, 12(4):13-17. [13] 王蓉.宝石颜色测量的新技术[D].武汉:中国地质大学,2007. [14] 金伟其,胡威捷.辐射度光度与色度及其测量[M].北京:北京理工大学出版社, 2006:39-50.
计量
- 文章访问数: 266
- HTML全文浏览量: 74
- PDF下载量: 27
下载:
