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Highly Nonstoichiometric YAG Ceramics with Modified Luminescence Properties

Journal Article · · Advanced Functional Materials
Abstract

Y3Al5O12(YAG) is a widely used phosphor host. Its optical properties are controlled by chemical substitution at its YO8or AlO6/AlO4sublattices, with emission wavelengths defined by rare‐earth and transition‐metal dopants that have been explored extensively. Nonstoichiometric compositions Y3+xAl5‐xO12(x ≠ 0) may offer a route to new emission wavelengths by distributing dopants over two or more sublattices simultaneously, producing new local coordination environments for the activator ions. However, YAG typically behaves as a line phase, and such compositions are therefore challenging to synthesize. Here, a series of highly nonstoichiometric Y3+xAl5‐xO12with 0 ≤ x ≤ 0.40 is reported, corresponding to ≤20% of the AlO6sublattice substituted by Y3+, synthesized by advanced melt‐quenching techniques. This impacts the up‐conversion luminescence of Yb3+/Er3+‐doped systems, whose yellow‐green emission differs from the red‐orange emission of their stoichiometric counterparts. In contrast, the YAG:Ce3+system has a different structural response to nonstoichiometry and its down‐conversion emission is only weakly affected. Analogous highly nonstoichiometric systems should be obtainable for a range of garnet materials, demonstrated here by the synthesis of Gd3.2Al4.8O12and Gd3.2Ga4.8O12. This opens pathways to property tuning by control of host stoichiometry, and the prospect of improved performance or new applications for garnet‐type materials.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-06CH11357
OSTI ID:
2423453
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 14 Vol. 33; ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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