MgAl2O4:Cr3+deep red-emissionco-precipitationIn this work, MgAl2O4:Cr3+ phosphor has been synthesized by the co-precipitation approach coupled with heat treatment. The phase structure, morphology, composition and luminescent properties of the phosphor were investigated in detail by x-ray diffraction...
(IRD), UR T058, 213 rue La Fayette, 75480 Paris Cedex 10, France 3 European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France The angular dependence (x-ray linear dichroism) of the Cr K pre-edge in MgAl2O4:Cr 3+ spinel is measured by means ...
MgAl2O4Cr3+Luminescence thermometryLuminescence probeTemperature sensing from the photoluminescence of MgAl2O4:Cr ceramic powder is systematically investigated. Material was prepared by self-propagating high temperature synthesis method. In this host, Cr experiences the strong crystal field, so the ...
Photoluminescence spectroscopy of Cr3+ shows considerable potential for probing local cation arrangement in MgAl2O4 spinel while undergoing order-disorder phase transition. The PL spectrum consists of R peaks (caused by ordered PL centers) and N peaks (caused by disordered PL centers). The peak ...
The optical absorption and luminescence spectra of MgAl 2 O 4 :Cr 3+ natural spinel (from Ural) have been measured at 77 K and 293 K. The luminescent emission from 4 T 2 g , 2 E g covers wide region of 600–750 nm. The emission spectrum at 77 K shows a very rich vibrational ...
The angular dependence (x-ray linear dichroism) of the Cr K pre-edge in MgAl2O4:Cr3+ spinel is measured by means of x-ray absorption near-edge structure spectroscopy and compared to calculations based on density functional theory (DFT) and ligand field multiplet (LFM) theory. We also ...
Effect of Ga3+ ion doping on emission thermal stability and efficiency of MgAl2O4:Cr3+ phosphordoi:10.1111/jace.19292crystal field environmentemission efficiencyGa3+ ionthermal stabilityIn this work, we fabricated a novel spinel‐type phosphor material MgAl 2 x Ga x O 4 doped with Cr 3+ by ...
2O4:Cr3+ nano powders]]>Cr3+ doped MgAl2O4 nano powders were prepared by the Pechini-type sol–gel process. Comprehensive analysis for the MgAl2- xO4: xCr3+(0≤ x≤0.05) nano crystalline was performed using X-ray...doi:10.1007/s10854-019-01678-2Yan Hao...
Time resolved photoluminescence spectra of natural MgAl2O4 spinel doped with Cr3+ ions have been investigated at room temperature in the wavelength range between 380 and 800 nm. Using several excitation sources from the different lasers we have observed a new band, namely K, with a peak of 15...
构造了3d3/3d7离子在三角对称晶场中考虑自旋-轨道相互作用,自旋-自旋相互作用和自旋-其它轨道相互作用的120阶微扰哈密顿矩阵.利用完全对角化该矩阵的方法计算了Cr3 :MgAl2O4晶体的基态能级,零场分裂参量,理论计算值与实验值相符合.定量研究了自旋二重态对基态能级的贡献,证明该贡献是不可忽略的.定量研究了自旋-...