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Radiation-induced Defects in Manganese-Doped Lithium Tetraborate Phosphor

Radiation-induced Defects in Manganese-Doped Lithium Tetraborate Phosphor

O Annalakshmi, M T Jose, U Madhusoodanan, J Sridevi, B Venkatraman, G Amarendra, A B Mandal

Radiat Prot Dosimetry. 2015 Jan;163(1):14-21.

PMID: 24743763

Abstract:

Lithium tetraborate doped with manganese synthesised by solid-state sintering technique exhibits a dosimetric peak at 280°C. The high-temperature glow curve results in no fading for three months. The sensitivity of Li2B4O7:Mn is determined to be 0.9 times that of TLD-100. The infrared spectrum of this phosphor indicates the presence of bond vibrations corresponding to BO4 tetrahedral and BO3 triangles. The mechanism for thermoluminescence in this phosphor was proposed based on the thermoluminescence (TL) emission spectra, kinetic analysis of TL glow curves and electron paramagnetic resonance (EPR) measurements on non-irradiated and gamma-irradiated phosphors. It was identified that oxygen vacancies and Boron oxygen hole centre (BOHC) are the electron and hole trap centres for TL in this phosphor. When the phosphor is heated, the electrons are released from the electron trap and recombine with the trapped holes. The excitation energy during the recombination is transferred to the nearby Mn(2+) ions, which emit light at 580 nm.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP12007602	Lithium tetraborate		12007-60-2	Price

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