(PEA)2PbBr4单晶的温度依赖性闪烁特性和机理,Journal of Materials Chemistry C

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(PEA)2PbBr4单晶的温度依赖性闪烁特性和机理
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2022-07-27 , DOI: 10.1039/d2tc01483a
Jacob Jasper van Blaaderen ₁ , Francesco Maddalena ₂ , Cuong Dang ₂ , Muhammad Danang Birowosuto ₃ , Pieter Dorenbos ₁

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在这项工作中，PEA ₂ PbBr _{4的闪烁特性}被研究为温度的函数，了解这些材料在低温应用中的潜在用途。已经使用与温度相关的光致发光发射和激发、X 射线激发发射和衰减测量的组合来研究闪烁特性和机制。在室温下，X 射线激发发射以 442 nm 发射为主，寿命为 35.2 ns。在 UV-Vis 光子激发下，在 412 nm 处观察到一个额外的发射峰。在 10 K 时，X 射线和 UV-Vis 光子激发发射光谱均显示 412 nm 处的窄发射峰和以 525 nm 为中心的宽发射带，寿命分别为 1.53 ns (24%) 和 154 ns (76%)分别。观察到的发射峰的确切性质尚不清楚。出于这个原因，我们探索了两种可能的机制来解释 UV-Vis 光子和 X 射线激发之间的差异及其与温度相关的发射。总光谱强度降低到室温下 10 K 强度的 72%。这表明观察到的负热猝灭行为是由于在 X 射线激发下更多的自吸收和更高程度的自捕获激子形成的组合. 基于在 10 K 下观察到的快速衰减分量和在室温下每 MeV 9400 光子的光产率，在 10 K 下仅显示出 28% 的下降，这可能使这种材料在低温和快速计时应用中具有潜在意义。总光谱强度降低到室温下 10 K 强度的 72%。这表明观察到的负热猝灭行为是由于在 X 射线激发下更多的自吸收和更高程度的自捕获激子形成的组合. 基于在 10 K 下观察到的快速衰减分量和在室温下每 MeV 9400 光子的光产率，在 10 K 下仅显示出 28% 的下降，这可能使这种材料在低温和快速计时应用中具有潜在意义。总光谱强度降低到室温下 10 K 强度的 72%。这表明观察到的负热猝灭行为是由于在 X 射线激发下更多的自吸收和更高程度的自捕获激子形成的组合. 基于在 10 K 下观察到的快速衰减分量和在室温下每 MeV 9400 光子的光产率，在 10 K 下仅显示出 28% 的下降，这可能使这种材料在低温和快速计时应用中具有潜在意义。

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Temperature dependent scintillation properties and mechanisms of (PEA)2PbBr4 single crystals

In this work the scintillation properties of PEA₂PbBr₄ are studied as function of temperature, accessing the potential use of these materials for low temperature applications. The scintillation properties and mechanism have been studied using a combination of temperature dependent photoluminescence emission and excitation, X-ray excited emission and decay measurements. At room temperature the X-ray excited emission is dominated by the 442 nm emission with a lifetime of 35.2 ns. Under UV-Vis photon excitation an additional emission peak is observed at 412 nm. At 10 K, both X-ray and UV-Vis photon excited emission spectra show a narrow emission peak at 412 nm and a broad emission band centred around 525 nm with a lifetime of 1.53 ns (24%) and 154 ns (76%) respectively. The exact nature of the observed emission peaks is not known. For this reason two potential mechanisms explaining the difference between UV-Vis photon and X-ray excitation and their temperature dependent emissions are explored. The total spectral intensity decreases to 72% of the intensity at room temperature at 10 K. It is suggested that the observed negative thermal quenching behaviour results from a combination of more self absorption and a higher degree of self trapped exciton formation under X-ray excitation. Based on the observed fast decay component at 10 K and light yield of 9400 photons per MeV at room temperature, showing only a 28% decrease at 10 K, could make this material potentially interesting for low temperature and fast timing applications.

更新日期：2022-07-27

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