Back to Search
Start Over
Yellow-to-violet upconversion in neodymium oxide nanocrystal/titania/ormosil composite sol–gel thin films derived at low temperature
- Source :
- Journal of Applied Physics. 90:4865-4867
- Publication Year :
- 2001
- Publisher :
- AIP Publishing, 2001.
-
Abstract
- Neodymium (III) oxide nanocrystals synthesized by the inverse microemulsion technique were dispersed in sol–gel titania/organically modified silane (ormosil) composite thin films for photonic applications. X-ray diffraction analysis and transmission electron microscopy observation show that the neodymium oxide nanoparticles have a nanocrystalline structure and that the size of the nanoparticles is in the range of 5–60 nm. An intense room-temperature yellow-to-violet upconversion emission at 402 nm (4D3/2→4I13/2) was measured from the composite thin film heated at 100 °C upon excitation with a yellow light at 587 nm. In addition to this violet emission, ultraviolet emission at 372 nm and blue emission at 468 nm were also observed. The lifetime of the violet emission was measured and the mechanism of the upconversion emission is proposed, and they indicate excited-state absorption originating from the long-lived 4F3/2 excited state should be responsible for the yellow-to-violet upconversion.
- Subjects :
- Photoluminescence
Materials science
business.industry
Oxide
General Physics and Astronomy
chemistry.chemical_element
Photochemistry
Ormosil
Neodymium
Photon upconversion
Nanocrystalline material
chemistry.chemical_compound
Nanocrystal
chemistry
Transmission electron microscopy
Optoelectronics
business
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........adc30b39823b12ab19926950f16666bc