Pr^(3+)在石榴石结构Ca_(2)LuScGa_(2)Ge_(2)O_(12)中的温度响应性质

Temperature Response Properties of Pr^(3+)in Ca_(2)LuScGa_(2)Ge_(2)O_(12) with Garnet Structure

采用高温固相法制备了具有石榴石结构的Ca_(2)LuScGa_(2)Ge_(2)O_(12):Pr^(3+)红色荧光粉。使用X射线衍射(XRD)、扫描电镜(SEM)以及光致发光光谱(PL)等手段研究了荧光粉的晶体结构、表观形貌及发光性质。研究了80~500 K范围内Ca_(2)Lu_(1)ScGa_(2)Ge_(2)O_(12):0.001Pr^(3+)荧光粉的发光性质。研究发现^(1)D_(2)→^(3)H_(4),^(3)P_(0)→^(3)H_(4)和^(3)P_(0)→^(3)H_(5),^(3)P_(1)→^(3)H_(5)这两对跃迁发射的强度比随温度的升高有单调的连续变化,其中^(3)P_(1),^(3)P_(0)能级是Pr^(3+)的热耦合能级。通过灵敏度分析,其温度传感最大相对灵敏度值Sr为2.6283%·K^(-1)(80 K),最大绝对灵敏度值为Sa为0.00253 K^(-1)(350 K)。显示该材料在温度传感领域有潜在应用价值。

The Ca_(2)LuScGa_(2)Ge_(2)O_(12):Pr^(3+)red phosphor was prepared by the high temperature solid state method.The crystal structure,apparent morphology,and luminescent properties of Ca_(2)LuScGa_(2)Ge_(2)O_(12):Pr^(3+)phosphors were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and photoluminescence spectroscopy(PL).Under the excitation of ultraviolet light and visible light,both phosphors can show the characteristic emission of Pr^(3+)ions.At the same time,the luminescent properties of Ca_(2)LuScGa_(2)Ge_(2)O_(12):0.001Pr^(3+)phosphors at the temperatures range of 80~500 K were studied.It is found that the emission intensity ratio of^(1)D_(2)→^(3)H_(4),^(3)P_(0)→^(3)H_(4) and ^(3)P_(0)→^(3)H_(5),^(3)P_(1)→^(3)H_(5) has a monotonic and continuous change with the increase of temperature,and the^(3)P_(1) and^(3)P_(0) are the thermal coupling energy levels of Pr^(3+)ions.Through sensitivity analysis,the maximum relative sensitivity Srof temperature sensing is 2.6283%·K^(-1)(80 K),and the maximum absolute sensitivity Sais 0.00253 K^(-1)(350 K).It has potential application in temperature sensing field.