Sol-Gel
INM Information
  Laboratory Technology

 
 
Transparent Sol-Gel SiO2/CeO2
UV-blocking coatings

Transmission of dip-coated CeO2/SiO2(1:1) mixed oxide layers on borosilicate
glass and of the uncoated substrate. The UV-edge wavelength were determined
at half maximum transmission.

 Institut für
Neue Materialien
gem. GmbH

Im Stadtwald, Geb.43
D-66123 Saarbrücken
Germany

http://www.inm-gmbh.de

Management:
Tel.: ++49-681-9300-313
Fax: ++49-681-9300-223

Contact:
Prof. Dr. M. A. Aegerter,
Coating Technology
Department
Tel.: ++49-681-9300-317
Fax: ++49-681-9300-223

Objective
  • Development of UV-blocking coatings with effective cut-off features with steep edges and high transmission in the visible and IR region

Methods

  • Starting from a CeO2/SiO2 solution UV-absorbing coatings can be prepared by a dip-coating process. The cut-off behaviour of the coating can be tuned by the sol composition and the number of layers

Advantages

  • Reduced production costs in comparison to CeO2 containing glass
  • Coating of large glass panels (>1 m2) and different substrate shapes is possible

Results

  • Effective cut-off for UV-A and UV-B with edge wavelength between 310 and 390 nm
  • 90 % transmission in the visible and IR region
  
  • High stability under UV-irradiation
  • Can be processed up to 1000 °C:
    •

Influence of heat treatment at 1000 °C for 1 h and 1000 h on the UV cut-off behaviour of a UV blocking filter coated on both sides with a 200 nm CeO2/SiO2(1:1) coating

Applications

  • use as UV-cut-off coatings for:
  • lamps
  • windows (cars and buildings)
  • eye glasses