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Synthesis and Luminescence Properties of Pr³⁺-Doped BiPO₄ Polycrystals

100%

Chornii V., Nedilko S., Bychkov K., Terebilenko K., Slobodyanik M., Boyko V.

Acta Physica Polonica A

2018

vol. 133

issue 4

843-846

The results of synthesis, crystal structure characterization and luminescence properties study of the Pr³⁺-doped bismuth orthophosphate, BiPO₄, polycrystals are reported. It was found that doping of bismuth orthophosphate with praseodymium of concentration more than 1% leads to phase transition of BiPO₄ from so-called "high-temperature monoclinic" to "low-temperature monoclinic" structure. At room temperature studied samples revealed intensive red luminescence caused by radiation electronic transitions in the Pr³⁺ ions under their intrinsic f → f excitation at ³H₄→ ³P₁+¹I₆ absorption transition. Influence of phase transformation as well as multi-phonon and cross-relaxation processes on the luminescence of the Pr³⁺-doped BiPO₄ compounds were discussed.

Structure and Properties of Microcrystalline Cellulose "Ceramics-Like" Composites Incorporated with LaVO₄:Sm Oxide Compound

84%

Nedielko M., Alekseev O., Chornii V., Kovalov K., Lazarenko M., Nedilko S., Scherbatskyi V., Boyko V., Sheludko V.

Acta Physica Polonica A

2018

vol. 133

issue 4

838-842

Composite samples based on microcrystalline cellulose matrix incorporated with micro/nanoparticles of La_{0.7}Sm_{0.3}VO₄ complex oxide were made by cool pressing procedure. Morphology, crystallinity and characteristic luminescence and dielectric properties of the composites were studied. Their morphology can be described as "ceramics-like" type, as it consists of cellulose plates and embedded oxide particles. Luminescence spectra of the composites covers the range of the whole visible light, 350-750 nm, and comprises both wide band and narrow lines, related with host and oxide luminescence, respectively. Temperature dependences of the dielectric permittivity of composites showed the impact of the oxide particles on the characteristics of the microcrystalline cellulose. An assumption was made that this influence can be affected via water molecules, hydroxyl groups or molecules of the ambient gases. Studied composites can be perspective luminescent materials for transformation of ultraviolet and violet radiation into green-red light.

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2 Acta Physica Polonica A

2 2018

2 Boyko V.

2 Chornii V.

2 Nedilko S.

1 Alekseev O.

1 Bychkov K.

1 Kovalov K.

1 Lazarenko M.

1 Nedielko M.

1 Scherbatskyi V.

1 Sheludko V.

1 Slobodyanik M.

1 Terebilenko K.

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Synthesis and Luminescence Properties of Pr³⁺-Doped BiPO₄ Polycrystals

Structure and Properties of Microcrystalline Cellulose "Ceramics-Like" Composites Incorporated with LaVO₄:Sm Oxide Compound