Photoluminescence in ZrO2 doped with Y and La

Abstract

cubic forms depending on yttrium concentration. Additions of 8 mol % Y 2 O 3 or 12 mol % MgO and CaO in zirconia [9] stabilized the cubic structure with a homogeneous phase. YSZ Crystals (yttrium-stabilized zirconia) show a tetragonal structure that varies from 200 °C to 1200 °C. Recent studies about zirconate phases show that zirconium is optically active [14]. �owever, systems with yttrium addition do not show optical characteristics.The lanthanides series (Ln) are elements characterized by gradual occupation of 4f orbital. The electronic configuration AbstractThis study aims to describe the synthesis and optical characterization of a nanometric zirconium oxide solid solution containing yttrium and lanthanum. Zirconium citrate, yttrium nitrate and lanthanum nitrate were mixed in the ratios: 94 mol% of ZrO 2 -6 mol% of Y 2 O 3 and 92 mol% of ZrO 2 -6 mol % of Y 2 O 3 -2 mol % of La 2 O 3 . FTIR analysis shows organic material in decomposition and thermal analysis shows the transformation from the tetragonal to the monoclinic phase of zirconia, the loss of water molecule and zirconium dehydroxylation. The X-ray diffraction analysis shows a homogeneous phase formation of ZrO 2 -Y 2 O 3 -La 2 O 3 demonstrating that lanthanum addition does not cause phase formation, promoting a solid solution based on zirconia with cubic structure. The photoluminescence spectra show absorption bands at 562 nm and 572 nm (350 °C) and specific absorption bands at 543 nm, 561 nm, 614 nm and 641 nm (900 °C).

Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

“…At the same time RE 3+ substitution for Zr 4+ in the t-ZrO 2 lattice requires charge compensation. The latter leads to the formation of oxygen vacancies, and as a consequence, different optical defect centers [34,35]. We suggest that these oxygen-related defects could serve as an additional energy sink capable of compensating the Tb-Yb energy gap, and one-to-one photon conversion cannot be completely excluded here.…”

Спектры комбинационного рассеяния света и фотолюминесценция диоксида гафния, допированного катионами Ho, Er, Tm, Yb, Lu и Y

“…Для материалов на основе диоксида циркония было показано, что кроме люминесценции, обусловленной катионами РЗМ, существует и люминесценция, обусловленная собственными дефектами материала [29][30][31][32][33][34][35]. Она имеет меньшую интенсивность, чем люминесценция РЗМ-катионов, но ее существование сомнений не вызывает.…”

“…Можно выделить несколько причин люминесценции в этих материалах. Первая связана с собственной дефектной структурой [29][30][31][32][33], что делает материалы данного структурного типа уникальными. Наблюдаемые эффекты имеют невысокую интенсивность и повышенную чувствительность к условиям эксперимента [34], и, по-видимому, из-за этого мало изучены.…”

Raman and Photoluminescence Spectra for Ho, Er, Tm, Yb, Lu, and Y doped Hafnia

“…There can be singled out several causes of luminescence in these materials. The first one is associated with its own defective structure [29][30][31][32][33], which makes materials of this structural type unique. The observed effects have low intensity and increased sensitivity to experimental conditions [34], and, according to it-seems that due-to this they have been poorly known.…”