Visible emission from Er-doped SnO2 thin films deposited by sol-gel

Abstract

Emission from Er-doped SnO2 thin film deposited via sol-gel by the dip coating technique is obtained in the range 500-700 nm with peak at 530 nm (green). Electron-hole generation in the tin dioxide matrix is used to promote the rare-earth ion excitation. Evaluation of crystallite dimensions through X-ray diffraction results leads to nanoscopic size, what could play a relevant role in the emission spectra. The electron-hole mechanism is also responsible for the excitation of the transition in the 1540 nm range in powders obtained from the same precursor solution of films. The thin film matrix presents a very useful shape for technological application, since it allows integration in optical devices and the application of electric fields to operate electroluminescent devices.

Pure red upconverted and near‐infrared luminescence properties of Er3+‐doped SnO2 nanocrystals for lighting applications

“…The peak intensity is increased with increasing Er 3+ concentration. The presence of these peaks indicates the formation of some intermediate energy levels in the band gap which makes them vulnerable in the visible region [25].…”

“…The absorption in the vis-IR region is found to be increased with Er 3+ content up to 3 mol% and then decreased for higher concentrations. [25].…”

“…Using the sol-gel technique, Ravaro et al [25], deposited SnO 2 thin films doped with Er 3+ ions and observed green emission. The effect of concentration and annealing temperature on the upconversion and downconversion luminescence properties of Er 3+ -doped ZrO 2 .…”

“…Yildirim et al [24], used flame spray pyrolysis to prepare Er 3+ ‐doped titanium oxide (TiO 2 ) nanoparticles and studied luminescence properties under the excitation wavelengths of 364 and 810 nm including time‐resolved fluorescence spectra. Using the sol–gel technique, Ravaro et al [25], deposited SnO 2 thin films doped with Er 3+ ions and observed green emission. The effect of concentration and annealing temperature on the upconversion and downconversion luminescence properties of Er 3+ ‐doped ZrO 2 .Al 2 O 3 powders were studied [26].…”