Photochromism in RbAg4I5 thin films enhanced by hydrogen photosensitization simultaneous to illumination

Hydrogen photosensitization, photochromism, and surface-enhanced infrared absorption in AgI thin films

“…The printout effect in these films observed under vacuum can be drastically enhanced in DEA vapor, 31 with the condition of illumination as mentioned before. The normalized optical-density spectra for the RbAg 4 I 5 are calculated from the data presented in Ref.…”

“…3͒, similar to those peaking at E =4 eV ͑ = 310 nm͒ and E = 4.3 eV ͑ = 290 nm͒ in the RbAg 4 I 5 films illuminated in DEA vapor. 31 The band at E = 3.8 eV ͑ = 325 nm͒ is continuously shifting to higher energies up to E = 4.0 eV ͑ = 310 nm͒, whereas the band at E = 4.45 eV ͑ = 280 nm͒, arising first ͓Fig. 3͑b͒, curve 4͔, disappears after longer exposures ͓Fig.…”

“…The normalized optical-density spectra for the RbAg 4 I 5 are calculated from the data presented in Ref. 31. As it can be easily seen from comparison of curve 3 and curves 4-6 in Fig.…”

“…This phenomenon was termed by Mott and Gurney 5 as the "the printout effect." Evaporated AgI films hold the very special position concerning the photochromism: the printout effect under normal conditions was observed in evaporated AgCl thin films 28 and in evaporated RbAg 4 I 5 thin films, [28][29][30][31] which have the structure very similar to that of AgI whereas the AgI thin films, evaporated onto unheated substrates, exhibit absolute insensitiveness to the action of light, either in air or under vacuum, even after very long exposures.…”

Nanosized WO3 thin film as a multifunctional hydrogen material for achieving photolysis in CuCl films via hydrogen photosensitization

“…E.g., the bands at E max = 4.3 eV (l= 290 nm) and at E max = 4.0 eV (l= 310 nm), appearing during photolysis, were observed in thin Rb 4 Ag 4 I 5 films [54]. Similar bands peaked E max = 4.45 eV and E max = 4.1 eV were observed in AgI films [28].…”