All Questions
Tagged with fluorescence phosphorescence
11
questions
8
votes
1
answer
2k
views
What chemical(s) in peanut butter cause it to glow under UV light?
It is relatively well known that peanut butter glows in the dark under UV light (if you don't believe me, see this short YouTube demo by NileRed).
I've tried it myself and it is clearly a real thing.
...
- 37k
0
votes
1
answer
614
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Compounds with fluorescence and/or phosphorescence, what can do both? [closed]
What else (besides benzophenone) can both do phosphorescence but not fluorescence, and what else can do both phosphorescence and fluorescence? For example, does pentacene can do both?
I'm reading that ...
- 375
6
votes
1
answer
264
views
Lifetime components in phosphorescence decay
I'm studying the phosphorescence decay of diacetyl in acetonitrile (it has a high quantum yield of intersystem crossing). The fluorimeter than I'm employing has microsecond resolution and, since the ...
user78790
5
votes
3
answers
352
views
Excited states and emission lifetimes
I have some doubts about the nomenclature of the lifetimes. Are singlet and fluorescence lifetimes the same? As well as the triplet and phosphorescence lifetimes?
Also, can the triplet/phosphorescence ...
user78790
0
votes
4
answers
180
views
Fluorescence: what mechanism regulates the rate of discharge of energy?
The other day, I noticed a strip of fluorescent tape when the lights in the room were turned off.
The energy was discharged as a continued, faint glow, rather than one burst or flash of light.
How so? ...
- 111
2
votes
0
answers
1k
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Data analysis in TCSPC for fluorescene decay (reconvolution with measured IRF)
I am trying to understand the data analysis of fluorescence decay counts measured by TCSPC technique, particularly with reconvolution with measured IRF.
I am able to get the fitted counts (given by ...
- 139
1
vote
0
answers
102
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Common chemcials that produce phosphorescence
Are there any common lab chemicals or household stuff that produce phosphorescence?
I am aware of ZnS, CaS, Fluorescein, Erythrosin B, Vanillin Benzaldehyde, Vitamin B2, Tryptophan etc.
I just need ...
- 139
0
votes
0
answers
43
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When an electron is excited to a singlet state, must it flip its spin state to enter the triplet state and flip once more to the ground state?
I understand the Jablonski diagram in that it has intersystem crossing from the singlet state to the triplet state, but how many spin switches are necessary to complete to phosphores? When an electron ...
- 21
4
votes
1
answer
2k
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Why are glow-in-the-dark things usually green?
I've noticed that many glow-in-the-dark objects you can purchase in the store are green. Occasionally I would come across something that was orange or blue, but mostly it seems that green is the ...
- 6,771
6
votes
2
answers
618
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Why do glow-in-the-dark substances dim gradually?
Related: How do things glow in the dark?
Growing up, I had glow-in-the-dark stars on my ceiling and after being "charged" by having my lights on, they would phosphoresce for quite some time.
...
- 6,771
8
votes
1
answer
142
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Is it right to say that fluorescent lamps are actually fluorescent?
Fluorescence occurs rapidly ($\approx 10^{-6}$ to $10^{-9}$ s) but phosphorescence is slow, and is therefore observable ($> 10^{-4}$ s). So, is it right to say that fluorescent lamps actually ...
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