This paper reports a series of Cr⁴⁺: LiInGeO₄, based on a high-temperature solid-phase synthesis method and the effect of LiInGeO₄-doped Cr⁴⁺ ions on the spectral properties and luminescence colors in the near-infrared region. Under 808 nm excitation, the emission spectra showed a broad band at 1000–1500 nm, with a maximum peak occurring at 1218 nm due to the ³T₂→³A₂ transition of Cr⁴⁺ ions. The lifetime decreases with the increasing amount of Cr⁴⁺ ions, from 8.30035 μs to 6.656. The chromium's chemical composition and valence state in LiInGeO₄ were analysed by x-ray photoelectron spectroscopy. The results showed that the chromium in LiInGeO₄ was tetravalent, and no trivalent chromium was found. The results show that LiInGeO₄ crystals can have promising applicability in anti-counterfeiting due to the possibility of both up-conversion and down-conversion glowing.

本文报道了一系列Cr ⁴⁺ : LiInGeO ₄，基于高温固相合成方法和LiInGeO ₄掺杂的Cr ⁴⁺离子对近红外区光谱特性和发光颜色的影响。在 808 nm 激发下，发射光谱在 1000-1500 nm 处显示出一个宽谱带，由于Cr ⁴⁺离子的³ T ₂ → ³ A ₂跃迁，最大峰值出现在 1218 nm 。寿命随着 Cr ⁴⁺离子数量的增加而减少，从 8.30035 μs 到 6.656。LiInGeO _{4 中}铬的化学成分和价态用 X 射线光电子能谱分析。结果表明，LiInGeO ₄中的铬为四价，未发现三价铬。结果表明，由于上转换和下转换发光的可能性，LiInGeO ₄晶体在防伪方面具有广阔的应用前景。