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Questions tagged [phosphorescence]

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8 votes
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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. ...
matt_black's user avatar
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0 votes
1 answer
613 views

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 ...
Neal Conroy's user avatar
6 votes
1 answer
263 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 ...
user avatar
1 vote
1 answer
68 views

If gaseous oxygen and dissolved oxygen (in water) have the same partial pressure, will they diffuse into solid materials at comparable rate?

To be specific, I am wondering about the dynamics of molecular oxygen diffusion into gas-permeable polymer materials, which is the sensing process of the optical oxygen probe (polymer-encapsulated ...
GradStudent_BME's user avatar
5 votes
3 answers
345 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 ...
user avatar
2 votes
1 answer
153 views

How does this coin-and-strike-paper trick work (and is it safe)?

When I was a kid I remember a thing an adult showed me where you would take a piece of strike paper from a matchbox, rest it on a "copper" coin (I have no idea what these coins are made of), ...
sh1's user avatar
  • 137
0 votes
4 answers
178 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? ...
Noffica's user avatar
  • 111
0 votes
0 answers
201 views

Why does zinc sulfide have to be doped with silver to phosphoresce?

$\ce{ZnS}$ is a boring white powder and it doesnt glow in the dark, but if its doped with silver it starts to show some phosphorescent properties.How does silver force zinc sulfide to do that?
Ferid9's user avatar
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2 votes
0 answers
1k views

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 ...
Crops's user avatar
  • 139
1 vote
0 answers
101 views

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 ...
Crops's user avatar
  • 139
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0 answers
42 views

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 ...
C. Al's user avatar
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1 answer
3k views

Why does zinc sulfide glow when hit by electrons? [duplicate]

In cathode ray tube experiment in order to check the direction of flow of electrons a hole was made in a note and behind it phosphorescent material zinc sulfide it was coated. Why does zinc sulfide ...
Tushar's user avatar
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4 votes
1 answer
2k views

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 ...
Melanie Shebel's user avatar
6 votes
2 answers
616 views

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. ...
Melanie Shebel's user avatar
3 votes
1 answer
1k views

Why is a spin change favourable in intersystem crossing?

All phosphorescent molecules go through the following transitions: $$\text{excited singlet state}$$ $$\Bigg\downarrow$$ $$\text{[intersystem crossing]}$$ $$\Bigg\downarrow$$ $$\text{ excited triplet ...
Rusty's user avatar
  • 133
8 votes
1 answer
141 views

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 ...
Acnologia's user avatar
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