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Thermoluminescence study of rare earth ion (Dy^(3+)) doped LiF:Mg crystals grown by EFG technique

Journal of Rare Earths 2012年第7期30卷 641-646页

作者： Pooja Seth Shruti Aggarwal S M Rao University School of Basic and Applied Science Guru Gobind Singh Indraprastha University Department of Physics Punjabi University

This work describes investigation of radiation dosimetry characteristics of magnesium （Mg） doped lithium fluoride （LiF） crystals co-doped with different concentrations of dysprosium （Dy）. These crystals were grown by edge defined film fed crystal growth （EFG） tech- nique. Thermoluminescence （TL） measurements were made on as grown （AG） and annealed （AN） crystals after they were irradiated with a gamma dose of 15 Gy. The influence and advantage of optimized Dy^3＋ concentration in enhancing the thermoluminescence （TL） properties of LiF：Mg samples were discussed. The normalized peak height of the annealed crystals was nearly 3 times that of the as grown crystals for the particular concentration samples irradiated with Co6~ gamma source showed linearity up to 10 Gy. Thermoluminescence signal observed over a period of one month showed negligible fading. Thermoluminescence glow curve structure of optimized phosphor remained stable for higher doses of gamma rays of 103 Gy. Glow curve was analyzed using computer glow curve deconvolution （CGCD） method and trapping parame- ters were calculated.

关键词： thermoluminescenea rare earth ions annealing edge defined film fed growth technique

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非线性光学晶体K_(3.0)Li_(2.0)Nb_(5.0)O_(15.0)的生长

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人工晶体学报 2000年第S1期29卷 65-页

作者：宋有庭倪代秦吴星中国科学院物理研究所凝聚态物理中心北京100080

Potassium lithium niobate single crystal with a dimension of 20mm×15mm×30mm was grown by EFG technique in our *** with Czochralski method for the growth of KLN crystals,EFG technique possesses the following *** of crystals can be weakened during the lowering of temperature and the crystals free of crack can be *** crystals have no rotation,the growth striation caused by the rotation of the crystals can be *** action of capillary from a die hole,the convective effect of melt at solid liquid interface can be reduced,therefore the homogeneity of crystals is better than that of crystals obtained by Czochralski *** growth striation parallels each other and is perpendicular to the growth direction,so the good blue SHG can be obtained when ground wave goes through the KLN *** capillary force does not fully counteract the convective effect,the inhomogeneity of crystals can’t completely be *** low SHG conversion efficiency of KLN crystals is mainly caused by inhomogeneneity of *** the growth of incongruent melting crystals,the growth rate is limited by the rejection of impurity,this also makes homogeneity of composition become *** the growth of KLN crystals by EFG technique,the fluctuation of the temperature at solid liquid interface should be enough small,and the film thickness of melt should be *** thick film of melt makes the process of crystal growth unstable;too thin film of melt can lead to the constitutional supercooling.

关键词： nonlinear optical crystal K 3.0 Li 2.0 Nb 5.0 O 15.0 crystal growth edge defined film fed growth technique

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