Sol-gel route to highly transparent (Ho0.05Y0.95)2Ti2O7 thin films for active optical components operating at 2 mm

0490319 - ÚFE 2019 RIV NL eng J - Článek v odborném periodiku
Vytykáčová, Soňa - Mrázek, Jan - Puchý, V. - Džunda, R. - Skála, Roman - Peterka, Pavel - Kašík, Ivan
Sol-gel route to highly transparent (Ho0.05Y0.95)2Ti2O7 thin films for active optical components operating at 2 mm.
Optical Materials. -, Č. 78 (2018), s. 415-420. ISSN 0925-3467. E-ISSN 1873-1252
Grant CEP: GA MŠMT(CZ) LD15122
Institucionální podpora: RVO:67985882 ; RVO:67985831
Klíčová slova: Thin films * Rare earth compounds * Phosphor
Obor OECD: Optics (including laser optics and quantum optics); Optics (including laser optics and quantum optics) (GLU-S)
Impakt faktor: 2.687, rok: 2018

We present a generic sol-gel route to the preparation of optically active nanocrystalline holmium-yttrium titanate (Ho0.5Y0.95)(2)Ti2O7 thin films, which exhibit a strong luminescence at 2 mu m. The films were prepared by the sol-gel process and thermally treated in a rapid thermal annealing furnace. The nano crystal size and optical properties were tailored by the processing temperature. The final film thickness was around 500 nm. X-ray diffraction analysis and Raman spectroscopy confirmed the high purity of the crystal phase of (Ho0.05Y0.95)(2)Ti2O7. The activation energy of crystal growth was 35.7 kJ mol(-1). The films had excellent structural and surface homogeneity causing their high transparency close to the theoretical limit of 93.39%. Refractive index of the film heat-treated at 1000 degrees C was around 1.98. The films exhibited strong emission at 2 mu m with a luminescence lifetime around 4.6 ms. Their properties together with processing feasibility make them promising materials for photonic applications
Trvalý link: http://hdl.handle.net/11104/0284564