The LaBr3:Ce Crystal Growth by Self-Seeding Bridgman Technique and Its Scintillation Properties

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• 作者：Hongsheng Shi ; Laishun Qin ; Wenxiang Chai ; Jiayu Guo ; Qinhua Wei ; Guohao Ren ; Kangying Shu
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：October 6, 2010
• 年：2010
• 卷：10
• 期：10
• 页码：4433-4436
• 全文大小：764K
• 年卷期：v.10,no.10(October 6, 2010)
• ISSN：1528-7505

文摘

The LaBr₃:Ce crystal is difficult to grow although it has very excellent scintillation properties. In this paper, the LaBr₃:Ce crystals have been grown by the self-seeding Bridgman technique, and the 38 mm × 50 mm LaBr₃:Ce single crystal ingot has been achieved. It is found that the orientation of the crystal growth has a close relationship with the lowering velocity and the quartz ampule shape. The 1 mm/h lowering velocity is very helpful for the [001] direction to dominate the crystal growth under the certain ampule shape, thus avoiding the crystal crack effectively, and the 0.5 mm/h lowering velocity is helpful for the [100] direction to dominate the crystal growth under the same ampule shape. On this basis, the mechanism of the nuclei competition is discussed. The UV luminescence and the X-ray excited emission spectra of the LaBr₃:Ce crystal have also been investigated.