Abstract
Far-red (FR) photosensitive pigment (PFR) is important for plant photomorphogenesis. Phosphor-converted (pc) LED is the next-generation FR light device. How to obtain FR-emitting phosphors with a good external quantum efficiency (EQE), suitable photoluminescence and high thermal stability is still a challenge. Herein, by optimizing the sintering technology and chemical design, we develop an excellent FR phosphor, Gd3Al4GaO12:Cr3+. The phosphor has an emission peak at 734 nm and a band width of 70 nm, matched well with the PFR absorption band. By adjusting the flux of H3BO3 and Cr3+ concentration, the EQE reaches 47.2%, and the thermal stability maintains 96.8% at 423 K. Because of its excellent optical properties, the power-conversion efficiency of the FR pc-LED reaches 24.0% driven at 100 mA, demonstrating the high performance and promising applications in the next-generation FR light source.
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