Cr3+在不同基质Y3Ga5O12或Ga2O3中的荧光特性

Fluorescence Characteristics of Cr3+in Different Matrices Y3Ga5O12or Ga2O3

以Ga2O3、Y2O3、Cr(NO3)3·9H2O为原料,柠檬酸为配位剂,通过溶胶-凝胶高温固相合成法制备出Ga2-2xO3∶2xCr^3+(Ga2O3∶xCr)与Y3Ga5-5xO12∶5xCr^3+(YGG∶xCr)2种多晶粉体(x=0.01,0.03,0.05,0.07)。并采用X射线衍射(XRD)、红外光谱(IR)、扫描电镜(SEM)、荧光光谱(PL)对样品的结构、组成、形貌和荧光性能进行测试分析。XRD和IR分析结果显示在900℃煅烧后Ga2O3∶xCr和YGG∶xCr两种样品均成相。SEM照片显示Ga2O3∶xCr样品形貌为柱形多面体,YGG∶xCr为短棒状。PL结果显示Cr^3+在Ga2O3和YGG两种基质中的最强荧光发射峰分别位于742和740nm,均属于Cr^3+的2E-4A2跃迁,对比发现Cr^3+在YGG基质中的荧光发射强度更强,在远红光区的荧光性能更好,能满足温室照明中植物光合作用的需求。

Two kinds of polycrystalline powders Ga2-2xO3∶2xCr^3+(Ga2O3∶xCr) and Y3Ga5-5xO12∶5xCr^3+(YGG∶xCr)(x=0.01,0.03,0.05,0.07) were synthesized by sol-gel high temperature solid phase synthesis with Ga2O3,Y2O3,Cr(NO3)3 ·9H2O as raw materials and citric acid as complexing agent.The X-ray diffraction (XRD),infrared spectroscopy (IR),scanning electron microscopy (SEM) and fluorescence spectroscopy (PL) were used to test and analyze the structure,composition,morphology and fluorescence performance of the powders.XRD and IR showed that all the samples has crystal structure independently on the substituent element;SEM photographs showed that the morphology of the Ga2O3∶xCr sample was cylindrical polyhedron,and the morphology of the YGG∶xCr powder was in the shape of short rod,both of two phosphor powders had agglomeration.The emission peak of two powders observed at 742 and 740 nm is due to 2E-4A2 transition from Cr^3+ ions.The results showed that the fluorescence emission intensity of YGG∶xCr was higher,and the emission peak wavelength region is suitable for photosynthesis in plants.