Nearfield scanning optical microscopy characterization of arrays of rare earth based nanocrystals

Thomas J. Mullen, Ming Zhang, Wei Feng, Rita El-khouri, Ling Dong Sun, Chun Hua Yan, Timothy E. Patten, Gang-yu Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Rare earth based nanocrystals are of great interest due to their unique photoluminescent characteristic of upconversion; absorption of near infrared radiation then emission of visible photons. Therefore, these materials provide excellent resolution for increasing the efficiency of solar cells by utilizing the 20% infrared and near infrared radiation of the sun. Using a home-constructed nearfield scanning optical microscope (NSOM), we studied the size, geometry, and surface functionality in correlation with the photoluminescent spectra of individual NaYF 4:Yb,Er nanocrystals and arrays of NaYF 4:Yb,Er nanocrystals generated by particle lithography. In contrast to prior aperture and apertureless NSOM, our new design exploits the photoluminescence of Si 3N 4 atomic force microscopy tips under laser excitation to delineate between near-field and far-field signals. These initial investigations provide new insights into the structure-spectroscopy relationship of engineered rare earth nanomaterials to guide the optimization of these nanomaterials in photovoltaic applications.

Original languageEnglish (US)
Title of host publicationACS National Meeting Book of Abstracts
Publication statusPublished - 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

Other

Other241st ACS National Meeting and Exposition
CountryUnited States
CityAnaheim, CA
Period3/27/113/31/11

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Mullen, T. J., Zhang, M., Feng, W., El-khouri, R., Sun, L. D., Yan, C. H., ... Liu, G. (2011). Nearfield scanning optical microscopy characterization of arrays of rare earth based nanocrystals. In ACS National Meeting Book of Abstracts