Strong emission at 1000 nm from Pr3+/Yb3+-codoped multicomponent tellurite glass.

To increase the emission intensity of Pr SP 3+ sp ions, Yb SP 3+ sp ions appear as an efficient sensitizer [[13]]. Due to a non-exponential character of the decay data, we have determined the experimental lifetime as being equal to the effective lifetime defined as HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>t</mi><mtext>eff</mtext></msub><mo>=</mo><mo> </mo><mi>t</mi><mo>-</mo><mi>I</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>-</mo><mi>d</mi><mi>t</mi><mo>/</mo><mo> </mo><mi>I</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>-</mo><mi>d</mi><mi>t</mi></math> ht Graph (4) Graph: Fig. [[36]]) HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><mi> </mi><mo>=</mo><mn>1</mn><mo>-</mo><mfrac><msub><mi> </mi><mtext>Pr</mtext><mo>-</mo><mtext>Yb</mtext></msub><msub><mi> </mi><mtext>Pr</mtext></msub></mfrac></math> ht Graph (5)where I i SB Pr-Yb sb and I i SB Pr sb are the effective lifetimes with and without Yb SP 3+ sp -coping, respectively, but for the same concentration of Pr SP 3+ sp ions. Emission spectra Emission spectra of Ln-doped samples TPr and TPrYb were measured in the same conditions allowing one to compare their relative intensities; additionally, in order to demonstrate the effect of the Pr SP 3+ sp ion concentration ( I N i SB Pr sb ; see Table 1) on the emission spectra, the PL signal of both samples (in arbitrary units) has been divided by I N i SB Pr sb . [Extracted from the article]