Synthesis and luminescence properties of Tb3+ and Dy3+ doped Li7La3Hf2O12 with tetragonal garnet structure
Source abstract
Abstract
Abstract A promising series of phosphors based on Li7La3Hf2O12:xLn3+ (Ln = Tb, Dy) has been prepared using a conventional solid state reaction and their luminescence properties have been investigated. The powder X-ray diffraction patterns show that Li7(La1-xLnx)3Hf2O12 (Ln = Tb, Dy) solid solutions crystallize in the tetragonal space group I41/acd, Z = 8. The photoluminescence spectra of Tb3+ doped Li7La3Hf2O12 contain well-known blue-green emission lines due to the 5D4→7FJ (J = 3–6) transitions of Tb3+. At relatively low activator concentrations, the blue emissions from the 5D3 level are observed along with emissions from the 5D4 level. The intensity ratio between the emission levels of 5D3 and 5D4 depends significantly on the terbium content, which makes it possible to obtain a tunable emission from green to yellowish green color. Under UV excitation, the emission spectra of Li7La3Hf2O12:xDy3+ phosphor exhibit several peaks attributed to the 4F9/2→6HJ (J = 11/2, 13/2 and 15/2) transitions with stable CIE chromaticity coordinates (0.417, 0.420) located in the white light region.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Microwave Dielectric Ceramics Synthesis · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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