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以稀土氧化物、硝酸铝为原料,采用溶胶-凝胶法合成了铒掺杂的钇铝石榴石(Y3Al5O12,YAG)纳米晶粉体。用X射线衍射(XRD)及傅里叶红外光谱(FTIR)确定前驱体和不同温度处理的粉末的相组成,同时表明在1200℃形成了结晶完全的YAG相。该粉体在波长为980nm的半导体激光器激发下发射出中心波长为666nm的红色上转换荧光及525nm、556nm的绿色上转换荧光,分别对应于Er3+离子的4F9/2→4I15/2,2H11/2→4I15/2,4S3/2→4I15/2跃迁。其中666nm的上转换荧光为双光子过程,激发态吸收和能量转移是主要的上转换机制。
Er3 + -doped Yttrium Aluminum Garnet (Y3Al5O12, YAG) nanocrystalline powders were synthesized by sol-gel method using rare earth oxides and aluminum nitrate as raw materials. The phase compositions of the precursors and the powders at different temperatures were determined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), respectively. It was also shown that a completely crystallized YAG phase was formed at 1200 ° C. Under the excitation of a semiconductor laser with a wavelength of 980 nm, the powder emits red up-converted fluorescence with a center wavelength of 666 nm and green up-converted fluorescence with a wavelength of 555 nm at 525 nm, corresponding to 4F9 / 2 → 4I15 / 2, 2H11 / 2 → 4I15 / 2,4S3 / 2 → 4I15 / 2 transitions. The up-conversion fluorescence at 666 nm is a two-photon process, and the up-conversion mechanism is the main absorption and energy transfer.