MgAl2O4∶Mn2+采用高温固相法在1350℃下合成了Mn^2+掺杂的MgAl2O4发光材料,利用X射线衍射对所合成样品的结构进行了表征.用209nm的紫外灯照射样品后,观察到来自Mn^2+的4T1-6A1跃迁的绿色长余辉发光.发光的激发光谱表明:Mn^2+-3d组态内存在一系列强的激发峰,分别在279,361,386,427,451nm,同时还有209nm处的...
MgAl2O4:Mn2+绿色荧光粉的合成与光学性质MgAl2O4: xMn2+ phosphors with various Mn2+ mole fraction x has been synthesized by high temperature solid-state reaction method. Upon blue excitation at 450 nm, the green emission band at 520 nm of Mn reaches the maximal intensity at x = 10%. Our ...
The internal quantum yield (IQY) of Mg0.93Al2O4:0.07Mn(2+) reached 63%. The emission intensity remained similar to 98% at 150 degrees C compared to its initial value at room temperature, showing excellent thermal quenching performance. The results indicated that MgAl2O4:Mn2+ ceramic phosphor...
MgAl2O4:Mn2+ hexagonal nanoplates have been synthesized via a simple two-step method. The nanoplates have uniform hexagonal morphology with an average edge length of 1 μm and thickness of 30 nm. X-ray diffraction and various microscopic techniques indicate that MgAl2O4:Mn2+ nanoplates are...
Synthesis and photoluminescence properties of MgAl2O4:Mn2+ hexagonal nanoplatesExperimental/ doping profilesmagnesium compoundsmanganesemultilayersnanostructured materialsnanotechnologyoptical materialsphotoluminescenceX-ray diffraction/ photoluminescence propertieshexagonal nanoplate synthesis...
Herein, a new strategy is demonstrated by the heavy doping Mn2+ into MgAl2O4, leading to the broad‐band near‐infrared (NIR) emission peaking at ≈825 nm with a full width at half maximum of ≈125 nm, as well as high internal quantum efficiency of ≈53% upon 450 nm laser excitation...
MgAl 2O 4:Mn spinels containing between 0 and 8% Mn by weight were prepared (a) by growth from an induction melt, and (b) by Mn + implantation into nonstoichiometric spinel crystals. Cathodolumenescence brightness measurements (520 nm emission band) were made as a function of Mn ...
xAl2(1-y)O4∶xMn2+,yCr3+ powders emit green light(515 nm) and red light(677 nm,694 nm) under pumping at 450 nm.It is found that the energy transfer exists in MgAl2O4 between Mn2+ and Cr3+ in the form of mutual energy accepting and donoring,and the Mn2+ ions have a strong ...
MgAl2O4: Mn2+ phosphorsSolid-state reactionGreen phosphorsOptical propertiesLEDsA none-rare earth elements-based Mn2+-doped MgAl2O4 green phosphor for LED applications was synthesized by a solid-state reaction method. X-ray diffraction analysis revealed that the synthesized phosphors have a spinel-...
MgAl2O4LuminescenceSpinelOptical propertiesAntisite defectsThe oxide host systems in use to date have very complicated crystalline phases and obtaining the pure phase requires specific synthesis procedures and high temperatures. Secondly, the expensive and bigger rare earth ions add up to the additional ...