Abstract
Near-infrared (NIR) optical devices play an important role in non-destructive imaging and detection in vitro. In particular, the NIR-II light has a better penetration depth. Phosphor conversion-LED is a preferred light source, which is highly dependent on the quality of the NIR phosphor. In this work, Cr3+ doped LiScGe2O6 NIR phosphor is synthesized and studied in detail. It can emit NIR-II light peaking at 926 nm at the range of 700–1400 nm, which covers NIR-I area and extends to NIR-II area with Dq/B = 1.69 of Tanabe-Sugano diagram. This phosphor has a very broad absorption band and can be excited by UV, blue, 660, and 808 nm light, respectively. The fabricated NIR LED using our Cr3+ doped LiScGe2O6 phosphor excited by blue chip can penetrate the palm and 1.5 cm pork meat effectively. NIR-II emission with multi spectral responsive in Cr3+ doping inorganic LiScGe2O6 based matrix is achieved for the first time.
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