NIR-Ⅱ photoluminescence analysis and valence characterization of Cr (IMAGE)
Caption
a, PL spectra of LaMgGa₁₁-xO₁₉:xCr³⁺ (x=0-2) under 440 nm excitation. b, Luminescence intensities of NIR-Ⅰ and NIR-Ⅱ versus Cr³⁺ concentration; c, PLE spectra of LaMgGa₁₁-xO₁₉:0.7Cr³⁺ monitoring at 890 and 1200 nm. The excitation signals result from the transitions of isolated Cr³⁺ ion. d, Cryogenic (80 K) UV-Vis-NIR diffuse reflectance curve validating that no absorption of Cr⁴⁺ ion can be traced. e, XPS curves of Cr₂O₃, LaMgGa₁₁-xO₁₉:0.2Cr³⁺, and LaMgGa₁₁-xO₁₉:0.7Cr³⁺ samples validating no chemical shift. f, EPR curves of LaMgGa₁₁-xO₁₉:0.2Cr³⁺ and LaMgGa₁₁-xO₁₉:0.7Cr³⁺ samples. In (f), the broad resonance signal with g of 1.96 is attributed to the Cr³⁺-Cr³⁺ pair, indicating strong interaction between Cr³⁺ ions.
Credit
by Shengqiang Liu, Jingxuan Du, Zhen Song, Chonggeng Ma, Quanlin Liu
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License
CC BY