Red Phosphorescence in Calcite
Inducktion, Fri May 15 2015, 02:06AMHiya guys;
Got some rock samples from the Oregon coast, and I believe they have calcite veins/crystals on them. They fizz really weakly with vinegar on them.
However when I take my 405 nm laser on them, they seem to glow a second after a deep red color. I looked it up and I'd like to try and figure out what's causing the deep red color.
Here's some pictures of the rocks.
I know the last one has some Agate in it.
But what do you guys think? IF there's some more tests I can try to narrow it down more please suggest them!
[Edit: Oversize pictures]
Re: Red Phosphorescence in Calcite
loneoceans, Fri May 15 2015, 06:24PM
Many calcium compunds phosphoresce..
hm.. Calcium sulfide?
loneoceans, Fri May 15 2015, 06:24PM
Many calcium compunds phosphoresce..
hm.. Calcium sulfide?
Re: Red Phosphorescence in Calcite
Bored Chemist, Fri May 15 2015, 10:34PM
Calcium sulphide is barely stable in air.
The colour of phosphorescence is strongly influenced by the impurities present.
Bored Chemist, Fri May 15 2015, 10:34PM
Calcium sulphide is barely stable in air.
The colour of phosphorescence is strongly influenced by the impurities present.
Re: Red Phosphorescence in Calcite
Shrad, Mon May 18 2015, 08:27AM
for what I know, you are experiencing color centers
Shrad, Mon May 18 2015, 08:27AM
for what I know, you are experiencing color centers
Re: Red Phosphorescence in Calcite
Conundrum, Wed Sept 02 2015, 09:31PM
CaS:Eu:Cu or CaS:Mn could be responsible here, recently one of the large EL manufacturers patented a red material.
Any metal sulphide will luminesce to some extent so what you are seeing could be a combination of laser induced phosphorescence and triggering of absorbed light emission in a similar way to how ZnS:Cu brightens then dims under infrared light.
see
Gwent in the UK sell this material, tried to get some but the postage is a bit high plus i only needed a tiny sample and the MOQ is in the 100 gram range.
Putting it in a low pressure helium atmosphere under electron bombardment would be a seriously cool experiment!
Conundrum, Wed Sept 02 2015, 09:31PM
CaS:Eu:Cu or CaS:Mn could be responsible here, recently one of the large EL manufacturers patented a red material.
Any metal sulphide will luminesce to some extent so what you are seeing could be a combination of laser induced phosphorescence and triggering of absorbed light emission in a similar way to how ZnS:Cu brightens then dims under infrared light.
see
Gwent in the UK sell this material, tried to get some but the postage is a bit high plus i only needed a tiny sample and the MOQ is in the 100 gram range.
Putting it in a low pressure helium atmosphere under electron bombardment would be a seriously cool experiment!
Re: Red Phosphorescence in Calcite
alan sailer, Tue Apr 19 2016, 09:25PM
As a side note to this discussion here is a link to a video showing calcite thermoluminescence. I am told by a good source that the effect comes from activation by radiation.
Thermoluminescence can be used to date materials and is used in some types of radiation dosimeters.
Cheers..
alan sailer, Tue Apr 19 2016, 09:25PM
As a side note to this discussion here is a link to a video showing calcite thermoluminescence. I am told by a good source that the effect comes from activation by radiation.
Thermoluminescence can be used to date materials and is used in some types of radiation dosimeters.
Cheers..
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