Table 5.
Main spectroscopic characteristics of luminescent semiconducting nanocrystals for optical fluorescence imaging. ε is the molar extinction coefficient associated with the main absorption, FWHM the width at half height of the emission band and Фf the quantum yield.
| QD | λabsorption (nm) |
λemission (nm) |
FWHM (nm) |
ε (M−1 cm−1) |
Фf (%) |
Ref. |
|---|---|---|---|---|---|---|
| CdS | 350–470 | 370–500 | ~30 | 1.0 × 105 (at 350 nm) 9.5 × 105 (at 450 nm) |
≤60 a | [118] |
| CdSe | 450–640 | 470–660 | ~30 | 1.0 × 105 (at 500 nm) 7.0 × 105 (at 630 nm) |
65 a 8 a |
[119] |
| CdTe | 500–700 | 520–750 | 35–45 | 1.3 × 105 (at 570) 6.0 × 105 (at 700 nm) |
30 a 75 a |
[120,121] |
| PbS | 800–3000 | >900 | 80–90 | − | 26 b 70 c |
[122,123,124] |
| PbSe | 900–4000 | >1000 | 80–90 | 1.23 × 105 | 45 d | [125,126] |
| InP | 550–650 | 620–720 | 50–90 | − | 10–60 | [127,128] |
(a) in CH3OH, (b) in HEPES, (c) in C6H14, and (d) in CHCl3.