Higher yield of photoreduction from Eu3+ to Eu2+ with shorter wavelength irradiation

✍ Scribed by Mitsuhiro Kusaba; Nobuaki Nakashima; Wataru Kawamura; Yasukazu Izawa; Chiyoe Yamanaka

• Book ID: 103032956
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 368 KB
• Volume: 197
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)86035-g

✦ Synopsis

We have found that the photoreduction yield from Eu3+ to Eu*+ depends on excitation wavelength within a single chargetransfer band. The quantum yields 4 were 0.12 k 0.02 (at I93 nm) and 0.06 + 0.0 1 (at 222 nm) in aqueous solution, and 0.42 t 0.07 (at 222 nm) and 0.35 kO.06 (at 248 nm) in methanol solution. The escape probability of Eu *+ from the photochemically prepared geminate pair is suggested to be higher with shorter-wavelength excitation.