常见翡翠的三维荧光光谱特征研究

doi:10.3964/j.issn.1000-0593(2021)03-0961-06

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Abstract Jadeite is a kind of precious jade. The value of different grades of jadeite varies greatly. Jadeite is treated by filling, dyeing, etc. to improve the appearance quality, and it is pretended to be natural jadeite. It is very necessary to identify jadeite jade. In this paper, the samples of A, B, C, B+C jadeite with different colors on the market are collected comprehensively. Based on the description of conventional gemological characteristics, the three-dimensional fluorescence spectra are tested. Three-dimensional fluorescence spectroscopy is a new fluorescence analysis technology developed in recent years. It has not been widely used in gemology. At present, the non-destructive testing of the gem filled with glue mainly depends on the infrared spectrum. The test results will be affected by the polishing degree of the sample surface and the transparency of the sample. The three-dimensional fluorescence spectroscopy technology has no high requirements on the polishing degree and transparency of the sample, to a certain extent, it can avoid the influence of the polishing degree and transparency of infrared spectrum on the test results，three-dimensional fluorescence spectroscopy technology is used to analyze the three-dimensional fluorescence spectrum characteristics of different types of jadeite samples on the market, Except that A jadeite has no fluorescence reaction, the fluorescence center of B jadeite is mostly concentrated at 380 nm(λ_ex)/440 nm(λ_em). It has moderate, strong blue-white fluorescence under long-wave of the ultraviolet lamp, The fluorescence center of C jadeite is concentrated at 365 nm(λ_ex)/443 nm(λ_em). It shows weak purple fluorescence under long and short-wavelength ultraviolet light. The fluorescence center of B+C purple jadeite is concentrated at 365(λ_ex)/443 nm(λ_em), It has blue-violet fluorescence under long-wavelength ultraviolet light, the fluorescence peak of B+C green jadeite is mainly concentrated at 290(λ_ex)/308 nm(λ_em), It has weak blue-white fluorescence under short wave ultraviolet light, the fluorescence peak of B+C yellow jadeite is concentrated at 335(λ_ex)/377 nm( λ_em), Weak green fluorescence appears under long-wavelength ultraviolet light, the fluorescence peak of B+C red jadeite is 290(λ_ex)/308 nm(λ_em). Weak green fluorescence under long-wavelength ultraviolet light. Under the 255 nm excitation light source, the luminescent range of jadeite jade with different treatment types is concentrated in the purple-blue region, the center wavelength of different processing types of jade is B+C green jadeite >B jadeite >C jadeite, Under the 365 nm excitation light source, the fluorescence intensity of jadeite samples is obviously stronger than that of short wave, and the luminescence range of jadeite jade with different treatment types is concentrated in the purple-green region, the center wavelength of different processing types of jadeite is B+C yellow jadeite >B+C green jadeite >B+C purple jadeite >C jadeite >B jadeite. Three-dimensional fluorescence spectroscopy is helpful to characterize resin, organic dyes, metal dyes. It can quickly and effectively identify different types of treated jadeite.

Key words：Three-dimensional fluorescence spectrum; Jadeite; Fluorescence characteristics

Received: 2020-08-19 Accepted: 2020-12-05

ZTFLH:

O657.3

Corresponding Authors: Andy Hsitien Shen E-mail: ahshen@foxmail.com

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2021)03-0961-06 OR https://www.gpxygpfx.com/EN/Y2021/V41/I03/961