On the Quenching of Bi3+ Luminescence in the Pyrochlore Gd2GaSbO7

✍ Scribed by A.M. Srivastava; A. Szarowski

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 124 KB
• Volume: 146
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8408

✦ Synopsis

The luminescence of Bi 3؉ in the pyrochlore Gd 2 GaSbO 7 is evaluated in the 15 to 300 K temperature range. The rapid thermal quenching of Bi 3؉ luminescence, despite the small Stokes shift, is postulated to involve a photoionization process arising from the interaction between the Bi 3؉ 3 P 0, 1 excited states and the host lattice conduction band. The blue emission of the host lattice is attributed to the octahedral gallate groups of Gd 2 GaSbO 7 . The Bi 3؉ luminescence Gd 2 GaSbO 7 , La 2 Zr 2 O 7 (pyrochlore structure), Y 2 O 3 (6uorite structure), and materials with the perovskite structure are compared to gain insight into structure-photoionization issues.