| Title |
Molten salt synthesis of Eu2+-doped Sr5(PO4)3Cl in air atmosphere: europium self-reduction and optical properties |
| Authors |
Bendžiūtė, Simona ; Stadulis, Jonas ; Doke, Guna ; Krieke, Guna ; Antuzevičs, Andris ; Pankratov, Vladimir ; Grigoravičiūtė, Inga ; Katelnikovas, Artūras ; Žarkov, Aleksej |
| DOI |
10.1039/d5dt02634b |
| Full Text |
|
| Is Part of |
Dalton transactions.. Cambridge : Royal Society of Chemistry. 2026, vol. 55, iss. 6, p. 2624-2634.. ISSN 1477-9226. eISSN 1477-9234 |
| Abstract [eng] |
In the present work, a series of Eu2+-doped Sr5(PO4)3Cl powders with varying Eu content was synthesized by the molten salt method in an air atmosphere. The self-reduction of Eu3+ to Eu2+ occurred during the phase transformation of starting Sr3(PO4)2:Eu to Sr5(PO4)3Cl:Eu in molten SrCl2. The synthesis conditions were optimized in terms of reaction temperature, time, and precursor-to-flux ratio. The optical properties of the obtained materials were investigated through photoluminescence, thermally stimulated luminescence, and persistent luminescence decay measurements. Regardless of the Eu concentration, the resulting powders possessed a dominating Eu2+-related broadband emission with a maximum at 445 nm; however, significantly weaker emission in the red region was also detected, suggesting incomplete reduction of Eu3+ to Eu2+. Minor emission tunability was achieved by varying the excitation wavelength, which allows for the elimination of Eu3+ emission. The analysis of trap properties indicated the presence of two types of traps. Although all obtained Ea values were deep, a weak persistent luminescence signal of Eu2+ can be detected for several hours after X-ray irradiation. |
| Published |
Cambridge : Royal Society of Chemistry |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
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