A novel scheme to acquire enhanced up-conversion emissions of Ho3+ and Yb3+ co-doped Sc2O3

Zhang, Chaoyi; Qian, Jiang; Wang, Xinyu; Liu, Jing; Xiao, Yantao; Li, Chun; Lin, Hai; Zeng, Fanming; Su, Zhong‐Min

doi:10.1016/j.cap.2019.10.002

Cited by 33 publications

(1 citation statement)

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“…It can be seen from the figure that the vibration absorption bands of all samples are basically the same, which proves that the main lattice structure of the doped crystals did not change, which corresponds to the XRD analysis of the Li 2 CaGe 1−x Cr x O 4 crystals. The main vibration absorption bands of the sample were concentrated in the range of 1000-400 cm −1 , and in the range of 4000-1000 cm −1 , there were mainly two absorption peaks at 3445 and 1443 cm −1 ; the vibration absorption band at 3445 cm −1 is a typical characteristic of hydroxyl stretching (γ-OH), while the absorption band at 1443 cm −1 is the absorption band of the OH vibration absorption of water and CO 3 2− of CO 2 in the air [28]. Figure 4b…”

Section: Fourier Infrared Spectrum Spectroscopy Analysismentioning

confidence: 99%

Investigation of the Structural and Luminescent Properties and the Chromium Ion Valence of Li2CaGeO4 Crystals Doped with Cr4+ Ions

et al. 2020

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Herein, we report on the growth of Cr4+–Li2CaGeO4 crystals by the flux growth method from the flux of LiCl, as well as on the effect of doping Li2CaGeO4 with Cr4+ ions on the NIR region spectral properties and crystal structure. The results quantified the occupancy of Cr4+ in Ge4+ sites. The emission spectrum presented broad bands in the NIR region, i.e., 1000–1500 nm excited by 980 nm, with maximum peaks at 1200 nm at room temperature caused by the transition of 3T2→3A2 in Cr4+ ions. The lifetime decreased with the Cr4+ ion doping concentration, specifically from 14.038 to 12.224 ms. The chemical composition and the valence state of chromium in Li2CaGeO4 were analyzed using X-ray photoelectron spectroscopy, which showed that the chromium in Li2CaGeO4 was tetravalent and no trivalent chromium was found. Therefore, the Cr4+–Li2CaGeO4 crystal has a great potential and future in optical applications.

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Section: Fourier Infrared Spectrum Spectroscopy Analysismentioning

confidence: 99%