Bulg. J. Phys. vol.35 no.3 (2008), pp. 198-212



Electro-Optical, Optical and Structural Properties of Mn Doped Potassium Chloride Crystals Prepared by a Mini Melt Growth Setup

J. Joseph1, V. Mathew1, K.E. Abraham2
1St. Aloysius' College, Edathua, Alappuzha, Kerala, India
2S.B. College, Changanacherry, Kottayam, Kerala, India
Abstract. Mn doped potassium chloride (KCl) crystals are prepared by melt growth using a cost effective mini crystal growth setup. The material is characterized by X-ray diffraction. The optical band gap of KCl crystal is calculated as 4.94 eV from the Diffused Reflectance Spectroscopy (DRS). Photoconductivity (PC) and photovoltaic (PV) studies of the material as a function of time, intensity of irradiation light and annealing temperature are studied. Photoluminescence (PL) spectra of KCl crystals are recorded at different annealing temperature and concentration of Mn. The spectral peak of KCl photoluminor lies around λem = 340 nm with excitation wavelength λexc = 274 nm. The broad peak observed around 340 nm corresponds to the 5D001S00 transition of Cl. Electro luminescence (EL) is measured with the help of a photomultiplier tube (PMT) and its EL brightness is measured as a function of the voltage of excitation at different annealing temperature and concentration of Mn.

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