Luminescence studies on RbI:Tb3+ crystals

✍ Scribed by P. K. Manimozhi; G. Muralidharan

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 222 KB
• Volume: 22
• Category: Article
• ISSN: 1522-7235
• DOI: 10.1002/bio.986

✦ Synopsis

Abstract

Optical absorption, photoluminescence, thermoluminescence (TL) and photostimulated luminescence (PSL) studies on RbI:Tb^3+^ crystals irradiated with γ‐rays is reported. Photoluminescence of these crystals exhibits characteristic Tb^3+^ emissions, due to transitions from the ^5^D~3~ and ^5^D~4~ levels to various levels of the ^7^F septet. On F‐bleaching the γ‐irradiated crystals, Z~3~ centres are observed. The TL glow curve indicates a two‐step thermal annihilation process for the radiatively created defects. The presence of the characteristic emissions due to terbium ions in the photostimulation at the F‐band, and TL emissions under both glow peaks, confirm the participation of Tb ions in the defect production and recombination processes. Trap parameters for the TL process are calculated and presented. The low temperature glow peak is attributable to Z~3~ centres. Copyright © 2007 John Wiley & Sons, Ltd.