Influence of Al3+ on the cross relaxation process and electrical properties of Dy3+ activated Gd2O3 phosphor for white LED application

Structural and optical characterisation of silanised Dy-doped-Gd2O3 NPs

“…12 Ln 3+ -doped Gd 2 O 3 nanomaterials (Ln 3+ = Dy, Sm, Tb, Eu, Pr, Tm, and Yb/Er) have shown an enhancement in dopant luminescence due to energy transfer from the matrix and Gd 3+ ions to the lanthanide cations. [13][14][15][16] It is essential to highlight that their optical properties such as intensity, quantum efficiency and emissive lifetime may be influenced by the morphology and particle sizes. For instance, L. Liu et al determined that the emission lifetime for Eu 3+ @Gd 2 O 3 nanotubes, monitoring the 5 D 0 -7 F 2 transition, increases from 0.9 ms to 2.01 ms compared to the bulk material because of a reduction in their phonon energy.…”

“…Gd 2 O 3 is an efficient antenna for Dy 3+ , being the dopant concentration crucial for achieving good energy transfer. 16,18 The emission of Dy-doped Gd 2 O 3 materials is sensitive to the structure (cubic or monoclinic Gd 2 O 3 ) and host matrix defects. For instance, T. R. Jeena et al observed a bluishgreen emission band at 527 nm for Dy@Gd 2 O 3 NPs, ascribed to surface defects and oxygen vacancies.…”