Near-infrared luminescence investigation of Cr4+ ions doped Li2TiGeO5

Abstract

In this paper, the preparation of a series of Li 2 TiGe 1-x Cr x O 5 phosphors by high-temperature solid-state reaction is reported. The results of X-ray diffraction show that the doping of Cr 4+ ions makes the lattice expand to a larger size. X-ray photoelectron spectroscopy (XPS) analysis shows that the chromium ions in the sample are tetravalent, con rmed further by uorescence spectroscopy. Under the excitation of 980nm laser, the Cr 4+ ions 3 T 2 doped 3 A 2 radiates transition and emits light at 1300nm. At the same time, the luminescence lifetime decreases with the increase in Cr 4+ ions doping concentration. Li 2 TiGe 1-x Cr x O 5 phosphors have a broad application prospect in near-infrared LEDs. Highlights 1. The Li 2 TiGe 1-x Cr x O 5 phosphor was prepared by the high-temperature solid-phase reaction method.2. The luminescence lifetime decreases with the increase in Cr 4+ ions doping concentration.. 3. Li 2 TiGe 1-x Cr x O 5 phosphors have a broad application prospect in near-infrared LEDs..