Efficient and Stable Gd₃Ga₅O₁₂:Cr³⁺ Phosphors for High-Performance NIR LEDs

Cr3+-activated Gd3Ga5O12 garnet (GGG:Cr3+) near-infrared (NIR) phosphors have shown promising applications in regulating plant growth. However, the low external quantum efficiency (EQE) results in a wall-plug efficiency (WPE) of phosphor-converted light-emitting diodes (pc)-LEDs of only approximate to 15%. Herein, an easy strategy to improve the luminescent properties of the GGG:Cr3+ phosphor is reported. Through optimization of the synthesized technology, the EQE is enhanced to 43.6%. Remarkably, the fabricated pc-LEDs achieve a WPE as high as 34.3%. These results demonstrate a significant advancement in the development and applications of NIR phosphor materials and NIR pc-LED devices.