Study on differential luminescence response of organic-inorganic lead halide perovskite
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摘要: 闪烁体发光光谱与闪烁发光时间等性能参数直接相关，为研究不同粒子激发下的差异化闪烁发光问题，实验研究发现了CH3NH3PbCl3钙钛矿单晶闪烁体在不同粒子激发下的差异化发光光谱与时间响应特征。采用逆温结晶水热法制备了钙钛矿单晶样品，发光光谱方面主要考虑了激发粒子、粗糙度和晶体温度等因素，并对照采用ps低能X射线和ps紫外脉冲激光激发，发现了钙钛矿晶体的差异化闪烁发光时间响应波形特征。实验结果表明，晶体表面粗糙度和晶体温度均可对发光光谱特征产生比较明显的影响，同时该闪烁体分别在X射线和激光激发下表现出完全不同的发光光谱特征，研究结果可为钙钛矿闪烁体在X射线探测技术中的相关应用研究工作提供重要补充。Abstract:
Background The performance of scintillation is directly related to the photoluminescence spectrum, scintillation luminescence time, etc.Purpose In order to study the typical spectral response of the trihalide perovskite CH3NH3PbCl3 single crystal scintillator, the characteristic of differential luminescence spectrum response was found.Methods Perovskite monocrystalline samples were prepared by reversed-temperature crystal growth method. The differential luminescence spectra of CH3NH3PbCl3 were studied under different conditions, such as particle excitation, surface roughness and crystal temperature.Results The experimental results show that both the surface roughness and the crystal temperature have obvious effects on the luminescence spectrum. And the perovskite crystal exhibits different scintillation luminescence time under X-ray and laser excitations, respectively.Conclusions The differential luminescence response has been discovered under several conditions. The results can play an important supplementary role in the applied research of perovskite scintillator in X-ray detection.-
Key words:
- scintillator /
- perovskite /
- X-ray detection /
- luminescence spectrum /
- time response
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图 1 CH3NH3PbCl3样品的X射线衍射谱图(XRD)
Figure 1. X-ray diffraction pattern of CH3NH3PbCl3 crystal sample
图 2 CH3NH3PbCl3样品的X射线荧光谱图(XRF)
Figure 2. X-ray fluorescence spectrum of CH3NH3PbCl3 crystal sample
图 4 CH3NH3PbCl3晶体的光致发光光谱
Figure 4. Photoluminescence spectra of CH3NH3PbCl3 crystal sample
图 5 不同温度下X射线激发CH3NH3PbCl3晶体发光光谱
Figure 5. Photoluminescence spectra of CH3NH3PbCl3 crystal sample under X-ray excitating at different temperatures
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