@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"
}