Upconversion Luminescence of CdTe Nanoparticles

Journal Article · Sat Apr 16 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.71.165304· OSTI ID:15016790

Joly, Alan G; Chen, Wei; McCready, David E; Malm, Jan-Olle; Bovin, Jan-Olov

Efficient upconversion luminescence is observed from CdTe nanoparticles in solution and precipitated as solids. In the solids, the upconversion luminescence spectrum is significantly red-shifted relative to the normal photoluminescence, whereas in solution, there is very little spectral shift. The upconversion luminescence exhibits a near quadratic laser power dependence, both at room temperature and at 10K. Both the upconversion and photoluminescence show similar decay dynamics with the solid samples showing shorter lifetimes compared to the solutions. This lifetime shortening is attributed to surface states is the likely upconversion excitation mechanism in these particles and that phonon populated defeat do not contribute to the upconversion.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 15016790
• Report Number(s): PNNL-SA-42170; 2214a; KP1303000
• Journal Information: Physical Review. B, Condensed Matter, Journal Name: Physical Review. B, Condensed Matter Vol. 71
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
EXCITATION
Environmental Molecular Sciences Laboratory
LASERS
LIFETIME
LUMINESCENCE
PHONONS
PHOTOLUMINESCENCE
SPECTRAL SHIFT