TY  - JOUR
AU  - Milenković, Katarina
AU  - Zeković, Ivana Lj.
AU  - Milićević, Bojana
AU  - Ristić, Zoran
AU  - Smits, Krisjanis
AU  - Popov, Anatoli I.
AU  - Dramićanin, Miroslav
AU  - Đorđević, Vesna
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13239
AB  - We synthesized Eu3+-doped CsY2F7 and RbY2F7 nanoparticles (orthorhombic crystal structure, Pnna space group, No. 52) by the microwave-assisted solvothermal technique and investigated the influence of reaction temperature and fluoride ion concentration on the particles’ phase and crystal structure. Fluoride ions were added in excess of the stoichiometric amount to achieve the orthorhombic phase for CsY2F7 and to convert the cubic RbY3F10 to the orthorhombic RbY2F7. Mild synthesis conditions yielded nanoparticles with crystallites ranging in size from 19 to 37 nm and a combination of spherical, rod-like, and hexagonal shapes. Nanoparticles emit a strong orange and red light when excited into the Eu3+ 5L6 level, which is centered around 390 nm. The strongest emission peak is around 612 nm, which comes from the 5D0→7F2 electronic transitions. Emission intensity dependence on Eu3+ concentration revealed that nanoparticles can be heavily doped with Eu3+, up to 25 % with respect to Y3+. Emission decay measurements provided values of excited state lifetimes of 6.2 ms for the Cs(Y0.75Eu0.25)2F7 and 6.0 ms for the Rb(Y0.75Eu0.25)2F7.
T2  - Ceramics International
T1  - Microwave-assisted solvothermal synthesis of Eu3+-doped CsY2F7 and RbY2F7 phosphorescent nanoparticles
IS  - InPress
DO  - 10.1016/j.ceramint.2024.04.394
ER  - 

@article{
author = "Milenković, Katarina and Zeković, Ivana Lj. and Milićević, Bojana and Ristić, Zoran and Smits, Krisjanis and Popov, Anatoli I. and Dramićanin, Miroslav and Đorđević, Vesna",
year = "2024",
abstract = "We synthesized Eu3+-doped CsY2F7 and RbY2F7 nanoparticles (orthorhombic crystal structure, Pnna space group, No. 52) by the microwave-assisted solvothermal technique and investigated the influence of reaction temperature and fluoride ion concentration on the particles’ phase and crystal structure. Fluoride ions were added in excess of the stoichiometric amount to achieve the orthorhombic phase for CsY2F7 and to convert the cubic RbY3F10 to the orthorhombic RbY2F7. Mild synthesis conditions yielded nanoparticles with crystallites ranging in size from 19 to 37 nm and a combination of spherical, rod-like, and hexagonal shapes. Nanoparticles emit a strong orange and red light when excited into the Eu3+ 5L6 level, which is centered around 390 nm. The strongest emission peak is around 612 nm, which comes from the 5D0→7F2 electronic transitions. Emission intensity dependence on Eu3+ concentration revealed that nanoparticles can be heavily doped with Eu3+, up to 25 % with respect to Y3+. Emission decay measurements provided values of excited state lifetimes of 6.2 ms for the Cs(Y0.75Eu0.25)2F7 and 6.0 ms for the Rb(Y0.75Eu0.25)2F7.",
journal = "Ceramics International",
title = "Microwave-assisted solvothermal synthesis of Eu3+-doped CsY2F7 and RbY2F7 phosphorescent nanoparticles",
number = "InPress",
doi = "10.1016/j.ceramint.2024.04.394"
}

Milenković, K., Zeković, I. Lj., Milićević, B., Ristić, Z., Smits, K., Popov, A. I., Dramićanin, M.,& Đorđević, V.. (2024). Microwave-assisted solvothermal synthesis of Eu3+-doped CsY2F7 and RbY2F7 phosphorescent nanoparticles. in Ceramics International(InPress).
https://doi.org/10.1016/j.ceramint.2024.04.394

Milenković K, Zeković IL, Milićević B, Ristić Z, Smits K, Popov AI, Dramićanin M, Đorđević V. Microwave-assisted solvothermal synthesis of Eu3+-doped CsY2F7 and RbY2F7 phosphorescent nanoparticles. in Ceramics International. 2024;(InPress).
doi:10.1016/j.ceramint.2024.04.394 .

Milenković, Katarina, Zeković, Ivana Lj., Milićević, Bojana, Ristić, Zoran, Smits, Krisjanis, Popov, Anatoli I., Dramićanin, Miroslav, Đorđević, Vesna, "Microwave-assisted solvothermal synthesis of Eu3+-doped CsY2F7 and RbY2F7 phosphorescent nanoparticles" in Ceramics International, no. InPress (2024),
https://doi.org/10.1016/j.ceramint.2024.04.394 . .

TY  - CONF
AU  - Raonić, Radoš
AU  - Ivetić, Tamara
AU  - Đačanin Far, Ljubica
AU  - Ristić, Zoran
AU  - Lukić-Petrović, Svetlana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13234
AB  - Yttrium niobate (YNbO4) is considered to be a self-activated phosphor with a strong emission band in the blue region originating from the NbO4 3- group, but also an effective host for various luminescent-based doping-altered applications with different rare-earth ions [1-4]. Here, (Y0.8-z,Mez)NbO4:Er,Yb (z = 0, 0.1, 0.2) phosphors with  0.05 erbium and 0.15 ytterbium as up-conversion (UC) activator and sensitizer, respectively, and different metal ions (Me) replacements of Y3+ ions that launch the host local lattice disorders, were synthesized by the traditional solid-state reaction method. The starting metal oxide precursors in the appropriate molar ratio were mixed in a ball mill at 100 rpm for 8 hours, then preannealed at 800 °C for 4 hours, and finally annealed at 1200 °C for 4 hours. The morphology of the synthesized phosphors and their particle size and shape were examined by scanning electron microscopy. X-ray diffraction measurements were used to confirm the crystal structure of samples. The emission spectra of Y0.8Er0.05Yb0.15NbO4 at room temperature under the excitation of 980 nm show green and red visible UC and near-infrared emission bands of very low intensity, which originate from energy transfer UC processes between Yb3+ and Er3+ ions and which are attributed to (2H11/2, 4S3/2) → 4I15/2, 4F9/2 → 4I15/2, and 4I9/2 → 4I15/2 transitions of Er3+ ions, respectively. The lifetime of the 4S3/2 excited energy level of Er3+ in Y0.8Er0.05Yb0.15NbO4 that depends on the host and plays an essential role in infrared to visible UC is 0.198 ms. UC mechanisms, the intensity of the UC emission, and changes in lifetime caused by different Me-ions entering the host lattice were discussed.
PB  - Belgrade : Society for science development of Serbia
C3  - ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts
T1  - Synthesis and characterization of (Y,Me)NbO4:Er,Yb phosphors: Influence of local lattice disorders
SP  - P-56
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13234
ER  - 

@conference{
author = "Raonić, Radoš and Ivetić, Tamara and Đačanin Far, Ljubica and Ristić, Zoran and Lukić-Petrović, Svetlana",
year = "2022",
abstract = "Yttrium niobate (YNbO4) is considered to be a self-activated phosphor with a strong emission band in the blue region originating from the NbO4 3- group, but also an effective host for various luminescent-based doping-altered applications with different rare-earth ions [1-4]. Here, (Y0.8-z,Mez)NbO4:Er,Yb (z = 0, 0.1, 0.2) phosphors with  0.05 erbium and 0.15 ytterbium as up-conversion (UC) activator and sensitizer, respectively, and different metal ions (Me) replacements of Y3+ ions that launch the host local lattice disorders, were synthesized by the traditional solid-state reaction method. The starting metal oxide precursors in the appropriate molar ratio were mixed in a ball mill at 100 rpm for 8 hours, then preannealed at 800 °C for 4 hours, and finally annealed at 1200 °C for 4 hours. The morphology of the synthesized phosphors and their particle size and shape were examined by scanning electron microscopy. X-ray diffraction measurements were used to confirm the crystal structure of samples. The emission spectra of Y0.8Er0.05Yb0.15NbO4 at room temperature under the excitation of 980 nm show green and red visible UC and near-infrared emission bands of very low intensity, which originate from energy transfer UC processes between Yb3+ and Er3+ ions and which are attributed to (2H11/2, 4S3/2) → 4I15/2, 4F9/2 → 4I15/2, and 4I9/2 → 4I15/2 transitions of Er3+ ions, respectively. The lifetime of the 4S3/2 excited energy level of Er3+ in Y0.8Er0.05Yb0.15NbO4 that depends on the host and plays an essential role in infrared to visible UC is 0.198 ms. UC mechanisms, the intensity of the UC emission, and changes in lifetime caused by different Me-ions entering the host lattice were discussed.",
publisher = "Belgrade : Society for science development of Serbia",
journal = "ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts",
title = "Synthesis and characterization of (Y,Me)NbO4:Er,Yb phosphors: Influence of local lattice disorders",
pages = "P-56",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13234"
}

Raonić, R., Ivetić, T., Đačanin Far, L., Ristić, Z.,& Lukić-Petrović, S.. (2022). Synthesis and characterization of (Y,Me)NbO4:Er,Yb phosphors: Influence of local lattice disorders. in ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts
Belgrade : Society for science development of Serbia., P-56.
https://hdl.handle.net/21.15107/rcub_vinar_13234

Raonić R, Ivetić T, Đačanin Far L, Ristić Z, Lukić-Petrović S. Synthesis and characterization of (Y,Me)NbO4:Er,Yb phosphors: Influence of local lattice disorders. in ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts. 2022;:P-56.
https://hdl.handle.net/21.15107/rcub_vinar_13234 .

Raonić, Radoš, Ivetić, Tamara, Đačanin Far, Ljubica, Ristić, Zoran, Lukić-Petrović, Svetlana, "Synthesis and characterization of (Y,Me)NbO4:Er,Yb phosphors: Influence of local lattice disorders" in ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts (2022):P-56,
https://hdl.handle.net/21.15107/rcub_vinar_13234 .