RT Journal Article
T1 Optical characterization and defect-induced behavior in ZnAl1.999Ho0.001O4 spinel: unraveling novel insights into structure, morphology, and spectroscopic features
A1 Elhamdi, I.
A1 Souissi, H.
A1 Taktak, O.
A1 Kammoun, S.
A1 Dhahri, E.
A1 Pina, J.
A1 Costa, B.F.O.
A1 López Lago, María Elena
K1 ZnAl1.999Ho0.001O4 spinel
K1 Raman
K1 FTIR
K1 UV/Vis spectroscopy
K1 Lanthanide
AB The ZnAl1.999Ho0.001O4 phosphor, prepared by the solid-state method, crystallizes in the cubic spinel structure. Morphology and chemical composition homogeneity were determined via Energy Dispersive X-ray and SEM analysis. The (Eg) optical band gap was evaluated from the UV/vis absorption spectrum, confirming direct transition behavior according to Tauc’s law. The Urbach energy (Eu) in the ZnAl1.999Ho0.001O4 spinel was higher than that in the ZnAl2O4 spinel, indicating increased disorder and a higher concentration of defects due to Ho3+ ions. The penetration depth (δ(λ)), optical extinction (k(λ)), and refractive index (n(λ)) were assessed across wavelengths (λ). The room temperature absorption spectrum revealed several peaks corresponding to the 4f-4f transitions of Ho3+ ions.
PB Elsevier
YR 2024
FD 2024-04-30
LK https://hdl.handle.net/10347/43043
UL https://hdl.handle.net/10347/43043
LA eng
NO Heliyon Volume 10, Issue 8, 30 April 2024, e29241
NO This work was supported by national funds from FCT – Fundacao para a Ciencia e a Tecnologia, I.P., within the projects UIDB/04564/2020 (DOI: 10.54499/UIDB/04564/2020), UIDP/04564/2020 (DOI: 10.54499/UIDP/04564/2020), UIDB/00313/2020 and UIDP/00313/2020. Access to TAIL-UC facility funded under QREN-Mais Centro Project No. ICT_2009_02_012_1890 is gratefully acknowledged.
DS Minerva
RD 23 abr 2026