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用脱氧剂非真空环境下Stockbarger方法生长未掺和掺铈、镧、铕的浓度范围在100~5000ppmwt的BaF2晶体.脱氧剂生长方法具有设备简单,不用抽真空和批量生产透明大单晶的特点.测量了这些晶体在室温下透射、激发,以及X射线和紫外光激发的发射光谱.由X射线激发,掺杂1000ppm的Ce样品具有峰值在307nm和321nm二个发射带,被归为放没有其它邻近铈离子条件下Ce(3+)的5d-4f跃迁.对于掺杂5000ppm的Ce晶体,新的发射带出现在峰值为340nm的326~375nm范围.新的发射带仍是Ce(3+)离子5d-4f跃迁引起的,与其它邻近Ce离子相互作用,使5d能级朝着较低能量迁移.1000ppm的样品具有最大发光强度,以及闪烁波长>300nm具有封闭电子壳层外加阳离子La(3+)很少影响心一价带跃迁(CVT),但是降低慢分量(激子)发射强度.BaF2:1wt%La样品的快/慢分量比>纯的样品的快/慢分量比.镧杂质抑制慢分量,并保持未掺BaF2辐照硬度.X射线激发BaF2:100ppmEu发射光谱呈现二个部分:相对强的300nm本征慢分量发光,以及~430和590nmEu(2+)离子二个特征弱?
Growth of un-doped BaF2 crystals doped with cerium, lanthanum and europium in the concentration range of 100-5000 ppmwt was carried out by the Stockbarger method under a non-vacuum environment using a deoxidizer. Deoxidizer growth method with simple equipment, without vacuum and mass production of large transparent single crystal. The emission spectra of these crystals were measured at room temperature for transmission, excitation, and X-ray and UV excitation. Excited by X-rays, a 1000 ppm doped Ce sample has two emission bands with peaks at 307 nm and 321 nm and is classified as a 5d-4f transition of Ce (3+) without other nearby cerium ions. The new emission band appeared in the 326 to 375 nm peak at 340 nm for 5000 ppm doped Ce crystals. The new emission band is still caused by the 5d-4f transition of Ce (3+) ions, interacting with other neighboring Ce ions, causing the 5d energy level to migrate toward lower energies. The 1000 ppm sample has the maximum luminescence intensity, and the blinking wavelength> 300 nm with a closed electron shell plus cation La (3+) seldom affects the CVT, but slows the emission of the slow (exciton) emission. BaF2: Fast / Slow Component Ratio of 1 wt% La Sample> Fast / Slow Component Ratio of Pure Sample. The lanthanum impurity inhibits slow components and keeps the hardness of the un-doped BaF2 irradiated. X-ray excitation BaF2: 100ppmEu emission spectrum presents two parts: relatively strong 300nm intrinsic slow component luminescence, and ~ 430 and 590nmEu (2+) ion two characteristics of weak?