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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Delayed Exciton Formation Involving Energetically Shallow Trap States in Colloidal CsPbBr3 Quantum Dots
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Delayed Exciton Formation Involving Energetically Shallow Trap States in Colloidal CsPbBr3 Quantum Dots

机译：延迟激子形成涉及胶体CSPBBR3量子点的能量浅陷阱状态

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We report the occurrence of delayed exciton formation in highly emissive CsPbBr3 quantum dots, which results in anomalously slow buildup kinetics that are readily observed in a time-resolved photoluminescence trace. It is inferred from the dependence of the buildup kinetics on nanoparticle size, temperature, and excitation fluence that the delayed exciton formation originates from multiple carrier trapping and detrapping events between the band edge state and energetically shallow structural disorder states. A kinetic model that incorporates these carrier pathways produces fits that are in excellent agreement with the time-resolved data. Importantly, the kinetic model allows for the determination of photoluminescence quantum yield values that closely match those obtained from integrating sphere measurements, whereas merely accounting for the pathways associated with the decay kinetics produces large discrepancies. This work highlights the crucial role played by delayed exciton formation in the photoluminescence dynamics of CsPbBr3 QDs.
机译：我们在高发射CSPBBR3量子点中报告了延迟激子形成的发生，这导致在时间分辨的光致发光迹线中容易观察的异常缓慢累积动力学。从累积动力学对纳米粒子尺寸，温度和激发的依赖性推断，延迟激子形成来自频带边缘状态和能量浅结构紊乱状态之间的多载体捕获和脱落事件。包含这些载体途径的动力学模型产生了与时间分辨数据的良好协议的契合。重要的是，动力学模型允许确定光致发光量子屈服值，该量子屈服值与集成球体测量获得的那些相匹配，而仅仅占与衰减动力学相关的途径产生了大的差异。这项工作突出了CSPBBR3 QD的光致发光动态中延迟激子形成所扮演的至关重要作用。

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