Abstract
In this study, lanthanum aluminosilicate glasses with compositions of 45SiO2–20Al2O3–12.5LaF3–10BaF2–9K2O–1Cr2O3–2.5Yb2O3 (SALBK) were prepared using the conventional melting method and copper–potassium ion exchange process. Influences of the ion exchange process between copper and potassium on the visible, upconversion, and near-infrared luminescence spectra of Cr3+/Yb3+ co-doped under excitations of 343, 490, and 980 nm LD were investigated. The EDS analysis of SALBK glasses was measured to confirm the presence of atoms in the glasses. The values of direct and indirect bandgaps of Cr3+/Yb3+ co-doped SALBK glasses were calculated and analyzed. Besides, the energy exchange processes between Cu+, Cu2+ ions, and Cr3+, Yb3+ ions were also proposed and discussed.
Highlights
In recent years, the spectroscopy and optical properties of chromium single-doped and chromium/rare-earth (RE) codoped have been extensively studied[1–5] due to their advantages.[6,7] Chromium is a transition metal (TM) with many different valence states.[8–10] In the glass networks, it o en exists in the trivalent state Cr3+,1–5,8 which can emit radiation in the visible (VIS), near-infrared (NIR) regions under different excitation wavelengths.[5,11,12] the 4T1g(F) / 4A2g, 4T2g(F) / 4A2g, 2T1g / 4A2g, 2T2g / 4A2g and 2E / 4A2g transitions of Cr3+ can be combined with Yb3+ to generate the VIS, NIR emission spectra.[5,13,14] In 2001, H
We study the in uences of the ion exchange process between copper and potassium on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in 45SiO2–20Al2O3–12.5LaF3–10BaF2–9K2O–1Cr2O3–2.5Yb2O3 lanthanum aluminosilicate glasses
In addition to the Energy-dispersive X-ray spectroscopy (EDS) peaks of the Si, O, Al, La, F, Ba, K, Cr, and Yb atoms in SALBK glass,[35] the ones of copper were strongly obtained corresponding to the energy values about 0.95, 8.04, and 8.99 keV,[36] which means that the copper and potassium ions have been added into the glass network through the ion exchange process.[37]
Summary
The spectroscopy and optical properties of chromium single-doped and chromium/rare-earth (RE) codoped have been extensively studied[1–5] due to their advantages.[6,7] Chromium is a transition metal (TM) with many different valence states.[8–10] In the glass networks, it o en exists in the trivalent state Cr3+,1–5,8 which can emit radiation in the visible (VIS), near-infrared (NIR) regions under different excitation wavelengths.[5,11,12] the 4T1g(F) / 4A2g, 4T2g(F) / 4A2g, 2T1g / 4A2g, 2T2g / 4A2g and 2E / 4A2g transitions of Cr3+ can be combined with Yb3+ to generate the VIS, NIR emission spectra.[5,13,14] In 2001, H. Our recent study[17] showed that the Cr3+/Yb3+ co-doped in the glasses generates emission spectra in the wavelength regions of 420–700 nm, 660–. We have been interested in enhancing emissions and optical properties of Cr3+/Yb3+ codoped in the glasses.[17,18]. To this aim, embedding the coinage ions (such as, Ag+, Cu+ ions) into the glass through the ion exchange process[20–22] is one of the different solutions which brought about positive results.[3,12,19]. We study the in uences of the ion exchange process between copper and potassium on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in 45SiO2–20Al2O3–12.5LaF3–10BaF2–9K2O–1Cr2O3–2.5Yb2O3 lanthanum aluminosilicate glasses. Cu+ and Cu2+ ions with Cr3+, Yb3+ ions was proposed and discussed
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