492CHAPTER 17 Smart precursors for smart nanoparticles
200
0
20
300400500600800700
Wavelength (nm)
40
60
80
100
% T
Abs
Wavelength (nm)
300200400500600800700
0
1
2
3
5
4
Phosphorescence
A molecule in the excited triplet state will not always use an intersystem crossing to return
to its ground state by losing energy by an emission of photons. A triplet/singlet transition is
always less probable than a single transition. The lifetime of the excited triplet state can be
up to 10 s, in comparison with 10
−5
–10
−8
s as an average lifetime for excited singlet state.
Emission from triplet to singlet state can continue after an initial irradiation with an inter ...
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