Mn和Fe过渡金属离子掺杂天然方钠石近红外发光特性

Near-Infrared Photoluminescence Properties of Natural Sodalite Activated with Mn and Fe Transition Metal Ions Doping

采用高温固相法制备了Na8Al6Si6O24Cl2∶Mn和Na8Al6Si6O24Cl2∶Fe近红外发光材料。测定了荧光粉的X射线粉末衍射(XRD),及室温下的光致近红外发射光谱和激发光谱。在400nm紫外光和602nm可见光的激发下,Na8Al6Si6O24Cl2∶Mn粉末中的Mn5+(3 A2—3 T2,3 A2—1 E)发射了主发射峰位于1 200nm的近红外光谱。实验发现,Mn和S共掺提高了该粉末的近红外发光强度,文中对此提出了S-2-Mn5+之间的能量传递机理。在334和500nm的激发下,Na8Al6Si6O24Cl2∶Fe粉末中的Fe2+(3 T1—5 E)发射了主发射峰位于1 000nm的红外光谱,该现象对提高硅太阳能电池的效率可能具有积极意义。

NaB A16 Sis 024 C12 ： Mn and Na8 Ale Si6 024 C12 ： Fe NIR phosphors were prepared by a solid-solid reaction at high tem perature. Their crystal structures of fluorescent powder were investigated by using X-ray powder diffraction （XRD）, and their NIR emission spectrum and excitation spectrum were measured at room temperature. The main emission peak of Mn5＋ in the NasA16Si6Oz4Clz ： Mn phosphor was observed at 1 200 nm in the NIR spectral region under 400 or 602 nm excitation, attribu ting to the 3A2-3T2 and 3A2-1E transitions of Mn5＋ ions. The characteristic NIR luminescence of Mn5＋ in sodalite is greatly enhanced by co-doping manganese and sulfur. A mechanism of the energy transfer between Se- and Mns＋ was also proposed here. The main emission peak of Fe^2＋ ions in the Na8Al6 Si6O24Cl2 ： Fe phosphor was recorded at 1 000 nm in the NIP, region under the excitation of 334 or 500 nm. This photoluminescence originated from the 3T1^-5E transition of Fe^2＋. Such an emission in the NIR region suggests a potential application in improving solar spectrum to enhance the efficiency of silicon solar cells.