Luminescence and structural characterization on praseodymium (Pr3+) doped potassium bromide (KBr) single crystals.

Author(s) Subban, B.; Dhanraj, R.
Journal Luminescence
Date Published 2018 Aug

The luminescence properties of praseodymium (Pr ) ion in potassium bromide (KBr) host have been investigated. The excitation bands observed in the region 220-300 nm are attributed to the transitions from 4f level to the 5d crystal field splitting levels of Pr ion. Emission bands originated due to transition of P → H (564 nm), P → H (604 nm), D → P (721 nm) and P → F (659 nm) have been observed. Optical absorption, photoluminescence (PL) and thermoluminescence (TL) studies confirms the trivalent state of Pr ion in KBr host. Trap parameters for the TL glow curve have been calculated and the values are tabulated by using Chen's peak shape method. The lattice cell parameters of Pr doped KBr single crystals are a = b = c = 6.596 Å, α = β = γ = 90°. From the scanning electron microscopy (SEM) micrograph analysis, the particle size ranges from a few micrometres to 5 μm. Electron paramagnetic resonance (EPR) spectrum exhibits two resonance signals at magnetic fields of 2895 and 3106 gauss with g-values of 2.32 and 2.16, respectively, calculated using Lande's formula.

DOI 10.1002/bio.3486
Keywords Bromides; Crystallization; Electron Spin Resonance Spectroscopy; Luminescent Agents; Luminescent Measurements; Microscopy, Electron, Scanning; Potassium Compounds; Praseodymium; Spectrum Analysis, Raman; X-Ray Diffraction
ISSN 1522-7243
Citation Luminescence. 2018;33(5):885890.

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