Wydział Chemii

Paweł Popielarski

Justyna Zeler

Paulina Bolek

Tetiana Zorenko

K. Paprocki

Eugeniusz Zych

Yuriy Zorenko

2019

Crystals

9

148/1-148/13

10.3390/cryst9030148

Naukowa

Angielski

Artykuł

This work is dedicated to the preparation and characterization of the radio-, thermo-, and photoluminescent properties of Lu₂O₃:Eu and Lu₂O₃:Tb nanopowder (NPs) scintillators, prepared by means of hydrothermal processing, and their film analogues made of these NPs by the spin coating method. The luminescent properties of NPs and films were characterized by cathodoluminescence (CL), photoluminescence (PL), X-ray excited radioluminescence (RL), and thermoluminescence (TL) at low and high temperatures. In Lu₂O₃:Eu NPs and films, mostly the luminescence of Eu³⁺ ions occupying the C₂ site of the host, with the most intensive peaks at 611.6 nm and a decay time of 1.5 ms, was observed. On the contrary, two types of Tb³⁺ centers in the C₂ and C_3i sites with the main emission lines at 542.4 and 544.0 nm and the corresponding 4f→5d excitation bands at 270 and 305 nm and decay times of t_1/e = 2.17 and 3.96 ms were observed in the case of Lu₂O₃:Tb NPs and films. Indications were noted that Tb³⁺ in the C_3i symmetry position was most active in the CL spectra of Lu₂O₃:Tb NPs and a respective film. Thermoluminescent peaks at 110 °C and 170 °C for Lu₂O₃:Eu NPs and at 75 °C and 120 °C in Lu₂O₃:Tb NPs were observed corresponding to the hole and electron traps, respectively. Significantly different onsets of temperature quenching of Eu³⁺ and Tb³⁺ luminescence in Lu₂O₃:Eu and Lu₂O₃:Tb NPs were found at ~90 °C and ~320 °C, respectively.

Lu2O3, Eu3+, Tb3+, luminescence, Nanopowders, films, spin coating

CC-BY

https://doi.org/10.3390/cryst9030148

http://www.mdpi.com/journal/metals