Luminescence spectroscopy and electronic structure of ZrP2O7 and KZr2(PO4)3 crystals

Electronic band structure and luminescence properties of powdered ZrP2O7 crystals

“…Then, the low-energy component of the spectrum, the D* band, corresponds to the excitation channel 'the VB top  the VRS of V O defects', and this excitation has a character of the charge-transfer transition O  Zr in the defective polyhedrons ZrO 5 6-. So, we have found some analogy in the origins of the UV PL and the high-energy component of the visible PL.…”

“…The most probable nature of its highenergy component (2.5÷3.5 eV) is radiation decay of excitons localized at a defective Zr octahedron, ZrO 5 6-plus oxygen vacancy. The low-energy component of the visible PL (1.5÷2.5 eV)…”

“…As a result, the origin of luminescence centres in these materials has been described for a strong UV emission band with the maximum located near 300 nm (~ 4.1 eV). It is known that this emission corresponds to charge-transfer processes in ZrO 6 octahedra [1,3,5].…”

“…Recently the authors of the study [5] have shown that ZrP 2 O 7 crystals are capable to luminesce in the visible optical region, too. It is obvious that the visible luminescence could decrease the intensity of the main UV band.…”

Synthesis and Luminescence Properties of Pr3+-Doped BiPO4 Polycrystals

“…Due to good physical and chemical properties various oxide compounds have been actively studied as materials for novel devices, in particular as luminescent materials. Although some of oxide compounds manifest characteristic own luminescence [3][4][5][6], their intensity and color purity are usually far from these ones required for displays and lighting. In order to overcome this drawback the various activator ions (typically ions of transition or rare-earth (RE) metals) are introduced into oxide host to obtain desirable light performance.…”