Abstract
The multiphoton near-infrared, quantum cutting luminescence in Er3+/Tm3+ co-doped telluride glass was studied. We found that the near-infrared 1800-nm luminescence intensity of (A) Er3+(8%)Tm3+(0.5%):telluride glass was approximately 4.4 to 19.5 times larger than that of (B) Tm3+(0.5%):telluride glass, and approximately 5.0 times larger than that of (C) Er3+(0.5%):telluride glass. Additionally, the infrared excitation spectra of the 1800 nm luminescence, as well as the visible excitation spectra of the 522 nm and 652 nm luminescence, of (A) Er3+(8%)Tm3+(0.5%):telluride glass are very similar to those of Er3+ ions in (C) Er3+(0.5%):telluride glass, with respect to the shapes of their excitation spectral waveforms and peak wavelengths. Moreover, we found that there is a strong spectral overlap and energy transfer between the infrared luminescence of Er3+ donor ions and the infrared absorption of Tm3+ acceptor ions. The efficiency of this energy transfer {4I13/2(Er3+) → 4I15/2(Er3+), 3H6(Tm3+) → 3F4(Tm3+)} between the Er3+ and Tm3+ ions is approximately 69.8%. Therefore, we can conclude that the observed behaviour is an interesting multiphoton, near-infrared, quantum cutting luminescence phenomenon that occurs in novel Er3+-Tm3+ ion pairs. These findings are significant for the development of next-generation environmentally friendly germanium solar cells, and near-to-mid infrared (1.8–2.0 μm) lasers pumped by GaN light emitting diodes.
Highlights
With the gradual depletion of fossil fuel energy sources and the increasing pollution of the environment, the development of new energy sources has become of utmost importance[1,2,3,4,5,6,7,8,9,10,11,12]
This improvement has led to the development of first-order, multiphoton quantum cutting germanium (Ge) and silicon–germanium (Si–Ge) solar cells[1, 7, 8, 12, 15, 27, 28], which are sensitive to wavelengths of 280–1850 nm and are environmentally friendly
From our previous work[28], we know that a telluride glass with an 8% mol concentration of Er3+ ions will exhibit intense first-order near-infrared quantum cutting luminescence phenomena
Summary
With the gradual depletion of fossil fuel energy sources and the increasing pollution of the environment, the development of new energy sources has become of utmost importance[1,2,3,4,5,6,7,8,9,10,11,12]. Meijerink[19, 27], Qiu and Zhou[12, 15], Zhang[7, 27], Huang[24], and our group[8, 28] have reported experimental research on first-order, multiphoton, near-infrared quantum cutting in Er3+ or Tm3+ activator-ion doped materials This improvement has led to the development of first-order, multiphoton quantum cutting germanium (Ge) and silicon–germanium (Si–Ge) solar cells[1, 7, 8, 12, 15, 27, 28], which are sensitive to wavelengths of 280–1850 nm and are environmentally friendly. The first-order, near-infrared, multiphoton quantum cutting processes with Er3+ or Tm3+ activators have large rates, high efficiencies, and excellent prospects for different applications
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