Blue LED-pumped intense short-wave infrared luminescence based on Cr<sup>3+</sup>-Yb<sup>3+</sup>-co-doped phosphors.

Light Sci Appl · 2022 · PMC9106724 · PMID 35562360

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an increasing trendno p-value reported

But the NIR luminescence intensity shows an increasing trend from x = 0.005 to 0.02 and then falls off when the Cr 3+ content continues to increase (the upper inset in Fig. 2b ).

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