Thermoluminescence and Optical Absorption Studies of Z1 Centers in KCI Crystals Doped with Praseodymium

✍ Scribed by K. Balraj; Dr. P. Veeresham

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 281 KB
• Volume: 27
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170270622

✦ Synopsis

Thermoluminescence (TL) of Pr-doped KCI is studied. The influence of pre-heat treatment and optical bleaching of the glow curves and the production of Z, centers are discussed. The glow curves of KC1 containing 1062 ppm of praseodymium (Pr) shows one shoulder at 365 K (TI) and two peaks around 408 K (T2) and 443 K (T,), respectively. Bleaching of X-irradiated crystals shows that the peak T, is enhanced whereas other two (T,, T,) get suppressed. Optical absorption studies of the crystals before and after F-bleaching shows that the F-band decreases and shifts towards longer wavelengths. The decrease is accompanied by broadening towards the longer wavelength. The TZ peak is attributed to Z, centres. It is shown that TI corresponds to shallow centers and T, peak is attributed to F-centers.