Spectral Conversion From Ultraviolet to Near Infrared in Yb³⁺‐Doped Pyrovanadate Zn₂V₂O₇ Particles

Abstract

Yb3+‐doped Zn2V2O7 particles were synthesized via the Pechini method. The crystal structure and morphology of the polycrystalline samples were investigated by X‐ray powder diffraction and scanning electron microscopy measurements, respectively. The reflectance spectrum, photoluminescence excitation, emission spectra, and the absolute quantum efficiency of the IR emission (900–1100) were measured. The intense near‐IR emission around 1000 nm attributed to the 2F5/2 → 2F7/2 transition of Yb3+ was observed under the excitation of ultraviolet light in the Yb3+‐doped pyrovanadate. The efficient energy transfer from VO4 groups into Yb3+ ions was confirmed by the optical spectra and fluorescent lifetime measurements. These results demonstrate that the Yb3+‐doped pyrovanadate particles are promising materials for spectral conversion from visible sunlight to near‐infrared emission and it may have potential application for spectral convertor to enhance the photoelectric conversion efficiency of c‐Si solar cells.

Density-functional study of pressure-induced phase transitions and electronic properties of Zn2V2O7

“…The band-structure calculations here reported support that Zn 2 V 2 O 7 is a wide band-gap material, clarifying discrepancies found in the literature with values for band-gap energy (E g ) going from 2.5 to 3.5 eV. 2,[13][14][15][16]…”

Deep‐red photoluminescence and long persistent luminescence in double perovstkite‐type La2MgGeO6:Mn4+

“…To date, phosphor materials with luminescence in the near‐infrared (NIR) region have been catching increasing attention for their potential applications in security markers, spectral conversion, and optical fluorescent probes . The phosphor materials showing NIR emission in the region of biologically transparent window (650–950 nm) can diminish auto‐fluorescence from tissue organic components, offering a higher signal‐to‐noise ratio for optical imaging .…”

Near-infrared quantum cutting of Ce3+–Nd3+ co-doped Y3Al5O12 crystal for crystalline silicon solar cells

“…Recently, much attention has been focused on the Yb 3+ and other rare earth (RE) ions co-doped materials (RE = Tb 3+ [7][8][9], Pr 3+ [8,10,11], Tm 3+ [8,10,12,13], Ce 3+ [14,15], Ho 3+ [16], Er 3+ [17,18]) to achieve efficient DC for solar cells. Besides that, the energy transfer from matrix to Yb 3+ have also been reported [19,20]. The advantage of Yb 3+ is attributed on its simple energy levels and 1000 nm emission that is consistent with the strongest spectral response of c-Si solar cells, and the high quantum efficiency (QE) of cooperative down-conversion emission from RE 3 + to Yb 3+ has been determined near 200% [7,8].…”