TY - JOUR
T1 - ZnS:Cu,Co water-soluble afterglow nanoparticles
T2 - Synthesis, luminescence and potential applications
AU - Ma, Lun
AU - Chen, Wei
PY - 2010/9/24
Y1 - 2010/9/24
N2 - Cu2+ and Co2+ co-doped zinc sulfide water-soluble nanoparticles (ZnS:Cu,Co) were prepared and their afterglow luminescence was observed and reported for the first time. The nanoparticles have a cubic zinc blende structure with average sizes of about 4 nm as determined by high-resolution transmission electron microscopy (HRTEM) and x-ray diffraction (XRD). In the photoluminescence, two emission peaks are observed at 470 and 510 nm. However, in the afterglow, only one peak is observed at around 525 nm. The blue emission at 470 nm is from surface states and the green emission at 525 nm is from Cu2+. This means that Cu2+ is responsible for the afterglow from the nanoparticles, while the co-doping of Co2+ is critical for the afterglow because no afterglow could be seen without co-doping with Co2+. The successful observation of the afterglow from water-soluble nanoparticles may open up new applications of afterglow phosphors in biological imaging, detection and treatment.
AB - Cu2+ and Co2+ co-doped zinc sulfide water-soluble nanoparticles (ZnS:Cu,Co) were prepared and their afterglow luminescence was observed and reported for the first time. The nanoparticles have a cubic zinc blende structure with average sizes of about 4 nm as determined by high-resolution transmission electron microscopy (HRTEM) and x-ray diffraction (XRD). In the photoluminescence, two emission peaks are observed at 470 and 510 nm. However, in the afterglow, only one peak is observed at around 525 nm. The blue emission at 470 nm is from surface states and the green emission at 525 nm is from Cu2+. This means that Cu2+ is responsible for the afterglow from the nanoparticles, while the co-doping of Co2+ is critical for the afterglow because no afterglow could be seen without co-doping with Co2+. The successful observation of the afterglow from water-soluble nanoparticles may open up new applications of afterglow phosphors in biological imaging, detection and treatment.
UR - http://www.scopus.com/inward/record.url?scp=77958594279&partnerID=8YFLogxK
U2 - 10.1088/0957-4484/21/38/385604
DO - 10.1088/0957-4484/21/38/385604
M3 - Article
C2 - 20798470
AN - SCOPUS:77958594279
SN - 0957-4484
VL - 21
JO - Nanotechnology
JF - Nanotechnology
IS - 38
M1 - 385604
ER -