Photoluminescence behaviors of single CdSe/ZnS/TOPO nanocrystals: Adsorption effects of water molecules onto nanocrystal surfaces

Journal of Luminescence

Volumn 127, Issue 1, 2007, Pages 198-203

  Oda, Masaru ^a,b   Hasegawa, Atsushi ^b   Iwami, Noriya ^b   Nishiura, Ken ^b   Ando, Naohisa ^b   Nishiyama, Akira ^b   Horiuchi, Hiromi ^b   Tani, Toshiro ^a,b  

^a JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

^b TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY   (Japan)

Author keywords

Adsorption; Charged trap sites; Nanocrystal; Photobrightening; Photoluminescence; Undulated behavior

Indexed keywords

ADSORPTION; CADMIUM COMPOUNDS; CRYSTALS; NITROGEN COMPOUNDS; PHOTOLUMINESCENCE; SURFACE TREATMENT;

CHARGED TRAP SITES; PHOTOBRIGHTENING; UNDULATED BEHAVIOR; WATER MOLECULES;

NANOCRYSTALS;

EID: 34248579240     PISSN: 00222313     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jlumin.2007.02.023     Document Type: Article

References (16)

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16. Our previous results on ensemble measurements [12] revealed two features in the modification of PL behaviors. One is that the PL modification can be detected only when there exist adsorbed polar molecules onto nanocrystal surfaces, i.e. the PL modification disappears when the sample is evacuated. The other is that detectable amount of the modified intensity depends on the number of irradiated photons during the time when there exist adsorbed polar molecules, i.e. some kind of irreversible transformation occurs only when the light irradiation and polar molecules' adsorption coexist. If it is assumed here that only the trap sites which are transformed irreversibly (or only the trap sites of which adjacent environment is transformed irreversibly) can be inactivated with the polar molecules' adsorption, both the previous and present results are explained consistently. However, the irreversible transformation under light irradiation has not been characterized yet until now. It may relate to re-arrangement or partial oxidization/reduction of atoms of (or near) the trap sites.