Abstract
Transparent fluorogermanate glass-ceramics singly doped with 0.25 mol.%Tm3+ have been prepared through melt quenching and sequential thermal treatment. The structure and composition of the glass-ceramics have been characterized by means of X-ray diffraction, Raman spectroscopy and transmission electron microscopy. Efficient three-step sequential three-photon near-infrared (NIR) quantum cutting has been demonstrated, where an absorbed blue photon at 468 nm could be cut into three NIR photons at 1190, 1462 and 1800 nm, respectively. The underlying mechanism has been analyzed in terms of the static and dynamic spectra measurements. Based on the experimental data and theoretical consideration, an internal quantum yield has been estimated to be about 160%. Further development of such a triply-cutting material might explore a way to design high efficient photonic devices, which harvest more photons emitted than absorbed in the excitation process.
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