Structural, photo, optical and thermal luminescent properties of beta barium metaborate

Barium borate compounds (BaB4O7 – β-BaB2O4) were produced by different synthesis methods, which include solution assisted solid state synthesis method (SAS), microwave assisted solid state synthesis method (MAS) and high temperature solid state synthesis method (HTS). These different synthesis metho...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-07, Vol.829, p.154430, Article 154430
Main Authors: iflazoğlu, Sera, Yılmaz, Ayşen, Bulur, Enver
Format: Article
Language:English
Subjects:
Barium
Barium borate
Characterization techniques
Dosimeters
Emission spectra
Exponential functions
Glow curves
High temperature
Luminescence
Optical properties
Optically stimulated luminescence
Phosphors
Photoluminescence
Quantum efficiency
Radiation dosage
Solid state
Synthesis
Thermoluminescence
X-ray luminescence
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Summary:Barium borate compounds (BaB4O7 – β-BaB2O4) were produced by different synthesis methods, which include solution assisted solid state synthesis method (SAS), microwave assisted solid state synthesis method (MAS) and high temperature solid state synthesis method (HTS). These different synthesis methods were carried out in air atmosphere (AA) and nitrogen atmosphere (NA). Luminescence emission spectra of barium borate compounds exhibited a broad band around 400 nm (∼310 nm excitation). X- ray induced luminescence measurements have shown a similar emission band, supporting the PL measurements. Photoluminescence decay curve of β-BaB2O4 compound (excited with 365 nm) is well fitted with a double exponential function with lifetimes τ1=3,69 ms and τ2=29,45 ms. At around 365 nm, Quantum Efficiency (QE) of the luminescence emission from β-BaB2B4 was calculated as 8 ± 1 percent. In order to test the possibility of using in radiation dosimetry, Optically Stimulated Luminescence (OSL) properties of β-BaB2O4 were investigated by determining radiation dose response, fading and repeatability of response. The OSL signal intensity was observed to increase linearly with increasing beta dose from 5 Gy to 1000 Gy. Thermoluminescence (TL) glow curve of β-BaB2O4 phosphor consist of broad glow peak with an apparent maximum at around 240 °C; which is also growing with radiation dose. The results presented here are of preliminary in nature and for a better understanding of the luminescence properties of β-BaB2O4 deserves more attention with possible applications as a phosphor and optical and dosimeter material. •BaB4O7 and β-BaB2O4 were produced by different synthesis methods and in different atmosphere.•Photoluminescence spectra of barium borate compounds exhibited a broad band around ∼400 nm (exc. 310 nm). X-ray Luminescence spectra supports photoluminescence results.•The decay curve of β-BaB2O4 luminescence lifetimes and measured at 365 nm.•The luminescence (PL,XL,OSL,TL) properties of β-BaB2O4 deserve more attention as possible optical and dosimeter material.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.154430