Broadband La₂LiSbO₆: Cr³⁺ Phosphors with Double Luminescent Centers for NIR pc-LEDs

The La₂LiSbO₆: xCr³⁺ phosphors were synthesized by means of a high-temperature solid-phase method. Based on the differences in ionic radius, valence state, and formation energy, the substitution sites of Cr³⁺ ions are discussed in detail. The optimized doping concentration of Cr³⁺ is determined to be 0.01. Under 517 nm excitation, the La₂LiSbO₆: 0.01Cr³⁺ phosphor presents a wide emission band (from 700 to 1350 nm) with a peak centered at 952 nm. Additionally, its corresponding full width at half-maximum is 155 nm, and the internal quantum efficiency reaches 62.4%. Meanwhile, the emission intensity of the La₂LiSbO₆: 0.01Cr³⁺ phosphor at 373 K is about 63.7% of that at room temperature, exhibiting good thermal stability. Aiming to fabricate a near-infrared phosphor-converted light-emitting diode device, the La₂LiSbO₆: 0.01Cr³⁺ phosphor is mixed with epoxy adhesive and cured on a green light-emitting diode chip. Under the irradiation of the fabricated light-emitting diode device, fruits and writing in the dark environment can be captured by a near-infrared camera. Hence, the La₂LiSbO₆: 0.01Cr³⁺ phosphor is promising for night vision.