Near-infrared luminescence investigation of Cr4 ions doped Li2TiGeO5.

Wang, Dongmei; Jiang, Xiliang; Leng, Zhuang; Wang, Xinyu; Yang, Weiling; Zhang, Tianqing; Shi, Xueming; Zhang, Xu; Zeng, Fanming; Li, Chun; Su, Zhongmin; Lin, Hai; Liu, Lina; Zhou, Yanyan; Zhang, Xuejian; Liu, Huisheng; Li, Yongtao

In this paper, the preparation of a series of Li2TiGe1−xCrxO5 phosphors by high-temperature solid-state reaction is reported. The results of X-ray diffraction show that the doping of Cr4 ions makes the lattice expand to a larger size. X-ray photoelectron spectroscopy analysis shows that the chromium ions in the sample are tetravalent, confirmed further by fluorescence spectroscopy. Under the excitation of 980 nm laser, the Cr4 ions 3T2 → 3A2 radiates transition and emits light at 1300 nm. At the same time, the luminescence lifetime decreases with the increase in Cr4 ions doping concentration. Li2TiGe1−xCrxO5 phosphors have a broad application prospect in near-infrared LEDs.

PHOSPHORS; LUMINESCENCE; X-ray photoelectron spectroscopy; CHROMIUM ions; IONS; FLUORESCENCE spectroscopy

Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 14, p18544

0957-4522

Academic Journal

10.1007/s10854-021-06118-8