Open AccessПеренос энергии от Ce-=SUP=-3+-=/SUP=- к Tb-=SUP=-3+-=/SUP=- в ортоборатах иттрия и гадолиния, полученных гидротермальным синтезом
Author(s) -
С.З. Шмурак,
В.В. Кедров,
А.П. Киселев,
Т.Н. Фурсова,
О.Г. Рыбченко
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.01.46903.192
Subject(s) - terbium , yttrium , cerium , photoluminescence , gadolinium , luminescence , excited state , ion , materials science , monoclinic crystal system , analytical chemistry (journal) , phosphor , doping , lutetium , crystallography , crystal structure , chemistry , inorganic chemistry , atomic physics , oxide , physics , optoelectronics , organic chemistry , chromatography , metallurgy
We studied the structure, IR absorption spectra, the spectral characteristics of photoluminescence and morphology of cerium- and terbium-doped orthoborates of gadolinium and yttrium obtained by hydrothermal synthesis at 200°C, as well as solid solutions of orthoborates on the basis of yttrium, gadolinium, and lutetium with composition RECe_0.01Tb_0.1BO_3 (RE = Lu_0.5Gd_0.39, Lu_0.5Y_0.39, and Y_0.5Gd_0.39). The X-ray diffraction spectrum of yttrium orthoborate Y_1 – _ x _– _ y Ce_ x Tb_ y BO_3 is described by a hexagonal lattice with space group P 6_3/ m , which, after annealing at 970°C, transforms into a monoclinic lattice with space group C 2/ c . High-temperature annealing of the studied orthoborates leads to a multiple, more than two orders of magnitude, increase in the luminescence intensity of Tb^3+ ions when the samples are excited in the absorption band of cerium ions. This effect is the result of a significant increase in the concentration of Ce^3+ ions in the orthoborates at high temperatures. It is shown that the luminescence of terbium ions is due to energy transfer from Ce^3+ to Tb^3+, which proceeds with high efficiency (∼85%) by the mechanism of dipole-dipole interaction between cerium and terbium.