Effect of thermal irradiation from evaporation source to photo-darkening sensitivity of vacuum deposited AgBr film
Abstract
Evaporated films from the AgBr-SnO2 mixture previously showed photochromic properties: darkened by ultraviolet (UV) irradiation and bleached by heating. However, AgBr film showed no photochromic property, and its photo-darkening sensitivity was less than that of AgBr-SnO2 films. The photo-darkening effect of vacuum deposited AgBr films is shown to be greately sensitized by thermal irradiation from the evaporation source. The degree of such sensitization effect is affected by the rise of substrate temperature during evaporation, and not affected to any significant degree by the absolute value of substrate temperature. When the substrate temperatures rises above 1 C, the value of optical density of these films darkened by UV irradiation reaches 1.8.
- Publication:
-
In its Res. Repts. of the Fac. of Eng
- Pub Date:
- December 1983
- Bibcode:
- 1983rrfe.nasa...35A
- Keywords:
-
- Films;
- Irradiation;
- Photochromism;
- Silver Bromides;
- Temperature Effects;
- Ultraviolet Radiation;
- Vacuum Deposition;
- Evaporation;
- Optical Density;
- Tin Oxides;
- Instrumentation and Photography