Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 17
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
One birthday today, congrats!
GrantX (34)


Next birthdays
03/30 Adam Horden (39)
03/30 Mr.Warwickshire (23)
03/31 Swedish Coiler (41)
Contact
If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.


Special Thanks To:
  • Aaron Holmes
  • Aaron Wheeler
  • Adam Horden
  • Alan Scrimgeour
  • Andre
  • Andrew Haynes
  • Anonymous000
  • asabase
  • Austin Weil
  • barney
  • Barry
  • Bert Hickman
  • Bill Kukowski
  • Blitzorn
  • Brandon Paradelas
  • Bruce Bowling
  • BubeeMike
  • Byong Park
  • Cesiumsponge
  • Chris F.
  • Chris Hooper
  • Corey Worthington
  • Derek Woodroffe
  • Dalus
  • Dan Strother
  • Daniel Davis
  • Daniel Uhrenholt
  • datasheetarchive
  • Dave Billington
  • Dave Marshall
  • David F.
  • Dennis Rogers
  • drelectrix
  • Dr. John Gudenas
  • Dr. Spark
  • E.TexasTesla
  • eastvoltresearch
  • Eirik Taylor
  • Erik Dyakov
  • Erlend^SE
  • Finn Hammer
  • Firebug24k
  • GalliumMan
  • Gary Peterson
  • George Slade
  • GhostNull
  • Gordon Mcknight
  • Graham Armitage
  • Grant
  • GreySoul
  • Henry H
  • IamSmooth
  • In memory of Leo Powning
  • Jacob Cash
  • James Howells
  • James Pawson
  • Jeff Greenfield
  • Jeff Thomas
  • Jesse Frost
  • Jim Mitchell
  • jlr134
  • Joe Mastroianni
  • John Forcina
  • John Oberg
  • John Willcutt
  • Jon Newcomb
  • klugesmith
  • Leslie Wright
  • Lutz Hoffman
  • Mads Barnkob
  • Martin King
  • Mats Karlsson
  • Matt Gibson
  • Matthew Guidry
  • mbd
  • Michael D'Angelo
  • Mikkel
  • mileswaldron
  • mister_rf
  • Neil Foster
  • Nick de Smith
  • Nick Soroka
  • nicklenorp
  • Nik
  • Norman Stanley
  • Patrick Coleman
  • Paul Brodie
  • Paul Jordan
  • Paul Montgomery
  • Ped
  • Peter Krogen
  • Peter Terren
  • PhilGood
  • Richard Feldman
  • Robert Bush
  • Royce Bailey
  • Scott Fusare
  • Scott Newman
  • smiffy
  • Stella
  • Steven Busic
  • Steve Conner
  • Steve Jones
  • Steve Ward
  • Sulaiman
  • Thomas Coyle
  • Thomas A. Wallace
  • Thomas W
  • Timo
  • Torch
  • Ulf Jonsson
  • vasil
  • Vaxian
  • vladi mazzilli
  • wastehl
  • Weston
  • William Kim
  • William N.
  • William Stehl
  • Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Forums
4hv.org :: Forums :: Chemistry
« Previous topic | Next topic »   

Red Phosphorescence in Calcite

Move Thread LAN_403
Inducktion
Fri May 15 2015, 02:06AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Hiya 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.

ZAyGU3v

ZtjVagF

PwGWDHD

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]
Back to top
loneoceans
Fri May 15 2015, 06:24PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
Many calcium compunds phosphoresce..
hm.. Calcium sulfide?
Back to top
Bored Chemist
Fri May 15 2015, 10:34PM
Bored Chemist Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Calcium sulphide is barely stable in air.
The colour of phosphorescence is strongly influenced by the impurities present.
Back to top
Shrad
Mon May 18 2015, 08:27AM
Shrad Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
for what I know, you are experiencing color centers

Link2

Back to top
Conundrum
Wed Sept 02 2015, 09:31PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
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 Link2
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!

Back to top
alan sailer
Tue Apr 19 2016, 09:25PM
alan sailer Registered Member #59110 Joined: Mon Apr 11 2016, 04:35PM
Location: Camarillo, California
Posts: 74
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.

Link2

Thermoluminescence can be used to date materials and is used in some types of radiation dosimeters.

Cheers..
Back to top

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.