用布里奇曼法成功制备出一种新颖的三元系碱金属卤化物闪烁晶体-KSr2I5∶Eu,加工后的晶体尺寸达15 mm×10 mm×10 mm.XRD测试结果与KSr2I5的标准卡片(卡片号为PDF#39-1140) 进行比对,结果一致.KSr2I5晶体密度为4.39 g/cm3,差示扫描量热法显示晶体的熔点约为470 ℃左右.荧光光谱和X射线激发发射光谱测试结果表明KSr2I5∶0.5%Eu晶体只有一个发射峰,位于445 nm处附近,属于典型的Eu2+的5d→4f的跃迁发射.计算表明,用PMTR1306测试KSr2I5∶0.5%Eu晶体的量子效率约为12.2%.作为一种新型的闪烁晶体具有潜在的商用化价值.
A ternary alkali metal halide scintillator, potassium strontium iodide, activated with divalent europium (KSr2I5∶ Eu2+) was successfully grown via the Bridgman method in this work.The single crystal machined has sizes up to 15 mm×10 mm×10 mm.The obtained XRD pattern was according with the data in JCPDS 39-1140.The calculated density of KSr2I5∶ Eu was 4.39 g/cm3.Differential scanning calorimetry indicates a congruent melting point of about 470 ℃.The photoluminescence spectrum and the X-ray excited emission spectrum indicate KSr2I5∶ 0.5%Eu single crystal has a single peak at about 445 nm, which dues to the typical 5d→4f transition in Eu2+.In addition, the tested quantum efficiency of KSr2I5∶ 0.5%Eu single crystal was 12.2% with PMTR1306.It is obvious from the above that KSr2I5∶ Eu has potential commercial value as a new scintillation crystal.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%