Colloidal Quantum Dots as Saturable Fluorophores
Although colloidal quantum dots (QDs) exhibit excellent photostability under mild excitation, intense illumination makes their emission increasingly intermittent, eventually leading to photobleaching. We study fluorescence of two commonly used types of QDs under pulsed excitation with varying power...
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| Veröffentlicht in: | ACS nano 2012-10, Vol.6 (10), p.8778-8782 |
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| creator | Schwartz, Osip Tenne, Ron Levitt, Jonathan M Deutsch, Zvicka Itzhakov, Stella Oron, Dan |
| description | Although colloidal quantum dots (QDs) exhibit excellent photostability under mild excitation, intense illumination makes their emission increasingly intermittent, eventually leading to photobleaching. We study fluorescence of two commonly used types of QDs under pulsed excitation with varying power and repetition rate. The photostability of QDs is found to improve dramatically at low repetition rates, allowing for prolonged optical saturation of QDs without apparent photodamage. This observation suggests that QD blinking is facilitated by absorption of light in a transient state with a microsecond decay time. Enhanced photostability of generic quantum dots under intense illumination opens up new prospects for fluorescence microscopy and spectroscopy. |
| doi_str_mv | 10.1021/nn302551v |
| format | Article |
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| ispartof | ACS nano, 2012-10, Vol.6 (10), p.8778-8782 |
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| source | MEDLINE; American Chemical Society Journals |
| subjects | Chemical compounds Colloids Colloids - chemistry Equipment Design Equipment Failure Analysis Excitation Fluorescence Illumination Materials Testing Microscopy Quantum Dots Repetition Saturation |
| title | Colloidal Quantum Dots as Saturable Fluorophores |
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