TY - JOUR
T1 - Influence of rhodamine 6G doping on the optical properties of TiO 2 sol-gel films
AU - Tomás, S. A.
AU - Stolik, S.
AU - Palomino, R.
AU - Lozada, R.
AU - Persson, C.
AU - Pepe, I.
AU - Da Silva, A. Ferreira
N1 - Funding Information:
The authors are grateful to the partial support of SNI-CONACyT (Mexico), CNPq, CNPq∕REMAN Grant No. 400.601∕04-4 and FAPESB (Brazil), and Swedish Research Council (Sweden). We also acknowledge the technical assistance of D. Jacinto.
PY - 2005/10/1
Y1 - 2005/10/1
N2 - Amorphous titanium dioxide (TiO2) thin films doped with rhodamine 6G (R6G) were deposited on glass substrates by the sol-gel process. The optical properties of the films were characterized by photoacoustic, excitation, and fluorescence spectroscopies. The absorption spectra of the R6G-doped TiO2 films exhibited two well-defined absorption regions: an absorption band over 2.0 eV attributed to rhodamine 6G and a band above 3.0 eV corresponding to TiO2 absorption. While the onset of the R6G absorption band was shifted by 0.06 eV towards lower energies as the R6G doping concentration increased within the interval of 0.01-0.10 mol %, the onset to high absorption (TiO2 band) for the doped films decreased only by 0.01 eV within the same interval. In addition, the optical absorption of undoped rutile-phase bulk TiO2 was calculated and compared to the experimental results. The estimated theoretical value of rutile TiO2 sample was 3.0 eV. This theoretical result shows good agreement when compared with the experimental data of undoped TiO2 sol-gel films, as well as the undoped TiO2 film prepared by sputtering.
AB - Amorphous titanium dioxide (TiO2) thin films doped with rhodamine 6G (R6G) were deposited on glass substrates by the sol-gel process. The optical properties of the films were characterized by photoacoustic, excitation, and fluorescence spectroscopies. The absorption spectra of the R6G-doped TiO2 films exhibited two well-defined absorption regions: an absorption band over 2.0 eV attributed to rhodamine 6G and a band above 3.0 eV corresponding to TiO2 absorption. While the onset of the R6G absorption band was shifted by 0.06 eV towards lower energies as the R6G doping concentration increased within the interval of 0.01-0.10 mol %, the onset to high absorption (TiO2 band) for the doped films decreased only by 0.01 eV within the same interval. In addition, the optical absorption of undoped rutile-phase bulk TiO2 was calculated and compared to the experimental results. The estimated theoretical value of rutile TiO2 sample was 3.0 eV. This theoretical result shows good agreement when compared with the experimental data of undoped TiO2 sol-gel films, as well as the undoped TiO2 film prepared by sputtering.
UR - http://www.scopus.com/inward/record.url?scp=27144547515&partnerID=8YFLogxK
U2 - 10.1063/1.2073972
DO - 10.1063/1.2073972
M3 - Artículo
AN - SCOPUS:27144547515
SN - 0021-8979
VL - 98
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 7
M1 - 073516
ER -