Luminescence properties and energy transfer of the near-infrared phosphor CaInGeO:Cr,Nd.

The double doping strategy based on energy transfer is an effective way to regulate the NIR spectral distribution. In this work, CaInGeO:Nd (CIG:Nd) and Ca InGeO:0.07Cr,Nd (CIG:0.07Cr,Nd) phosphors are successfully prepared a high-temperature solid-state method. CIG:0.07Cr shows broadband emission centered at 804 nm, which covers most of the excitation peaks of Nd ions. Under excitation at 480 nm, Cr can provide effective energy transfer to Nd. In addition, CIG:0.07Cr,0.15Nd has good temperature stability, and maintains 68.98% of the room-temperature intensity at 150 °C. The phosphors can convert short-wave photons to long-wave photons and enhance solar cell utilization, demonstrating the potential application of this material in solar spectral conversion technology.