Synthesis, Structure and Photoluminescent Properties of Far-Red Y3Ga5O12:Cr3+ Phosphors
Optical Materials X（2024）
Ningbo Institute of Materials Technology & Engineering
Abstract
Far-red (FR) photosensitive pigment (PFR) is vital for plant photomorphogenesis. Phosphor-converted (pc) LEDs are the next-generation FR light devices. How to obtain FR-emitting phosphors with a good quantum efficiency, suitable photoluminescence and high thermal stability is still difficult. Herein, we optimize the Y3Ga5O12:Cr3+ FR phosphor, which has an emission peak at 711 nm and a full width at half maximum of 74 nm, closing to the PFR absorption band. By adopting the solid-state sintering technology, the internal quantum efficiency reaches 85.5%, more than 1.5 time higher than that reported by the liquid reaction (55%). Furthermore, the external quantum efficiency reaches as high as 33.1%, indicating the promising application in FR-LEDs.
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Key words
Y3Ga5O12:Cr3+,garnet,Far-red-emitting,phosphor,plant growth
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