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Some natural type IIb diamonds phosphoresce blue after exposure to short-wave ultraviolet. In natural diamonds, fluorescence under X-rays is generally bluish-white, yellowish or greenish. Some diamonds, particularly Canadian diamonds, show no fluorescence. [19] [22] The origin of the luminescence colors is often unclear and not unique.
In October 2020, a population of diamonds were discovered within an alluvial deposit at the Ellendale diamond field in Australia that exhibit an ultra rare purple fluorescence. Some diamonds with "very strong" fluorescence can have a "milky" or "oily" look to them, but they are also very rare and are termed "over-blues."
In-house applications of X-ray diffraction has always been limited to the relatively few wavelengths shown in the table above. The available choice was much needed because the combination of certain wavelengths and certain elements present in a sample can lead to strong fluorescence which increases the background in the diffraction pattern.
Fluorescence of aragonite Necklace of rough diamonds under UV light (top) and normal light (bottom) In addition to the eponymous fluorspar, [65] many gemstones and minerals may have a distinctive fluorescence or may fluoresce differently under short-wave ultraviolet, long-wave ultraviolet, visible light, or X-rays.
Simplified atomic structure of the NV center. The nitrogen-vacancy center (N-V center or NV center) is one of numerous photoluminescent point defects in diamond.Its most explored and useful properties include its spin-dependent photoluminescence (which enables measurement of the electronic spin state using optically detected magnetic resonance), and its relatively long (millisecond) spin ...
Fluorescent nanodiamond is photostable, chemically inert, and has extended fluorescent lifetime, making it a great candidate for many biological applications. [23] Studies have shown that small photoluminescent diamond nanoparticles that remain free in the cytosol are excellent contenders for the transport of biomolecules.
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