Luminescence Centres in Thalium Doped Sodium Chloride

P. W. Deshpande¹, S. N. Patil¹ and K. P. Dhake²

¹Physics Department, Faculty of Science M.S. University of Baroda, Baroda-390 002, India. ²Applied Physics Department, Faculty of Technology & Engineering, M.S. University of Baroda, Baroda- 390 001, India.

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ABSTRACT:

The present paper is the study of excitation and emission spectra of Thallium doped Sodium Chloride phosphores in untreated and preheattreated conditions. The data for solid NaCl: TI phosphores is compared with that for saturated NaCI solution containing varying amounts of TICI. The visible emission in solid NaCI: TI phosphor is attributed to the complex ion centres. It is proposed that in NaCI: TI system negatively charged complex ions of the type (TICIn) act as luminescence centres, besides some other lumnescence centres.

KEYWORDS:

Luminescence Centres; Thalium; Chloride