Optical and electronic characterization of the band structure of blue methylene and rhodamine 6G-doped TiO2 sol-gel nanofilms
2005 (English)In: Microelectronics Journal, ISSN 0026-2692, Vol. 36, no 3-6, 570-573 p.Article in journal (Refereed) Published
The optical properties and the band structure of TiO2 sol-gel thin films prepared by the sot-gel process and doped with methylene blue or rhodamine were studied by absorption, excitation and emission spectroscopy. The absorption spectra show two absorption bands, around 2.3 eV and above 3.0 eV suggesting that besides the excitation bands observed in rhodamine at 2.3 eV an efficient energy transfer occurs between the TiO2 conduction band and the molecular rhodamine excited states, yielding a strong emission band at 600 nm, while for methylene blue a strong hypsochromic shift of the absorption bands is observed. The optical absorption and band gap energy for the phase rutile of TiO2 films were calculated with a LDA+U/FPLAPW method, and a comparison of this calculation with experimental data of TiO2 films prepared by undoped sol-gel and sputtering is performed.
Place, publisher, year, edition, pages
2005. Vol. 36, no 3-6, 570-573 p.
optical, sol-gel, band structure, behavior
IdentifiersURN: urn:nbn:se:kth:diva-14814DOI: 10.1016/j.mejo.2005.02.093ISI: 000229666000109ScopusID: 2-s2.0-33644518684OAI: oai:DiVA.org:kth-14814DiVA: diva2:332855
QC 20100525 QC 20111012. 5th International Conference on Low Dimensional Structures and Devices (LDSD 2004). Cancun, MEXICO. DEC 12-17, 2004 2010-08-052010-08-052011-10-12Bibliographically approved