Produção Nacional
Temperature sensing based on upconversion properties of Yb3+/Ho3+/Tm3+ tri-doped Y2O3 micro particles phosphors obtained by conventional precipitation method
2023; Elsevier BV; Volume: 297; Linguagem: Inglês
10.1016/j.mseb.2023.116780
ISSN1873-4944
AutoresRafael V. Perrella, Mengistie L. Debasu, Thaís K. L. Rezende, Jordy Angelo Carneiro, Helliomar P. Barbosa, Rute A. S. Ferreirab, Luís D. Carlos, Jefferson Luís Ferrari,
Tópico(s)Radiation Detection and Scintillator Technologies
ResumoUpconverter materials based on Y0.983-xYb0.012Ho0.005TmxO3, x = 0.000 – 0.012, were synthesized by conventional coprecipitation method followed by calcination process at different temperatures: 900, 1000, and 1100 °C for 4 h under air atmosphere. The materials were characterized by XRD, SEM, and PL. The effects of the dopant concentration and calcination temperature on the upconversion emission quantum yield were investigated upon excitation with CW laser diode at 980 nm, with tunable laser power pump. Predominant emission narrow bands arising from Ho3+ transitions (5F4,5S2→5I8) in the green region and Tm3+ (1G4→3H6) in the blue spectral region, and (3H4 → 4H6) in the infrared region, were observed. The material containing Yb3+, Ho3+ presented values of relative sensitivity (SR) from 1.3 K−1 (13 K) to 0.00119 K−1 (450 K) while the presence of the Yb3+, Ho3+, and Tm3+ in material exhibited 1.2 K−1 (13 K) to 0.00097 K−1 (450 K). The system showed emission via upconversion mechanism, even suspended in aqueous medium. Furthermore, the concentration of Tm3+ showed to be crucial for the change in the upconversion intensity of the present materials. These outcomes strongly suggest that the tri-doped Ho3+, Yb3+, and Tm3+ materials discussed here may be suitable for optical temperature sensing and PDT.
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