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Titolo:
Photooxidation and photobleaching of single CdSe/ZnS quantum dots probed by room-temperature time-resolved spectroscopy
Autore:
van Sark, WGJHM; Frederix, PLTM; Van den Heuvel, DJ; Gerritsen, HC; Bol, AA; van Lingen, JNJ; Donega, CD; Meijerink, A;
Indirizzi:
Univ Utrecht, Debye Inst, Dept Mol Biophys, NL-3508 TA Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3508 TA 3508 TA Utrecht, Netherlands Univ Utrecht, Debye Inst, Dept Phys & Chem Condensed Matter, NL-3508 TA Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3508 TA 3508 TA Utrecht, Netherlands Univ Utrecht, Fac Med, Dept Med Physiol, NL-3508 TA Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3508 TA 3508 TA Utrecht, Netherlands
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 35, volume: 105, anno: 2001,
pagine: 8281 - 8284
SICI:
1520-6106(20010906)105:35<8281:PAPOSC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUORESCENCE INTERMITTENCY; NANOCRYSTALS; PHOTOLUMINESCENCE; SURFACE; STATE; PHOTOCHEMISTRY; MICROSCOPY; DIFFUSION; KINETICS; BINDING;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: van Sark, WGJHM Univ Utrecht, Debye Inst, Dept Mol Biophys, POB 80000, NL-3508 TA Utrecht,Netherlands Univ Utrecht POB 80000 Utrecht Netherlands NL-3508 TA nds
Citazione:
W.G.J.H.M. van Sark et al., "Photooxidation and photobleaching of single CdSe/ZnS quantum dots probed by room-temperature time-resolved spectroscopy", J PHYS CH B, 105(35), 2001, pp. 8281-8284

Abstract

The room-temperature luminescence of single CdSe/ZnS core-shell quantum dots is investigated by spectrally and temporally resolved confocal microscopy. A large (30 nm) blue shift is observed in the emission wavelength duringillumination in air. In nitrogen, no blue shift is observed. The blue shift in air is ascribed to a 1 nm shrinkage of the CdSe core by photooxidation. Photobleaching occurs about 4 times faster in air than in nitrogen, indicating the formation of nonradiative recombination centers during photooxidation. The initial light output is higher in air than in nitrogen, which maybe due to a reduction of the defect state lifetime by oxygen.

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Documento generato il 22/10/20 alle ore 03:26:28