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Charge trapping and electroluminescence at quantum dots embedded in a polymer matrix

机译:嵌入聚合物基质中的量子点处的电荷俘获和电致发光

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摘要

We unambiguously demonstrate that mechanisms of photoluminescence (PL) and electroluminescence (EL) are different for CdSe/ZnS quantum dots (QDs) embedded in a polymer host. With increase in concentration of QDs, EL intensity increases exponentially when the impressed current is kept the same. In contrast, PL intensity shows only a linear dependence on the concentration of quantum dots. In the case of EL, the QDs of 3.2 nm diameter act as giant centers with a nearly temperature independent capture cross-section in the temperature range of 10-300 K. A phenomenological model of carrier capture is proposed in which the hole capture cross-section is exponentially distributed due to non-uniform distribution of QD particles in the host. We also show that EL yield and effective carrier mobility (μ_()eff) share identical non-Arrhenius temperature dependence for each concentration of embedded QDs. Possible origin of hole capture mechanisms are discussed in the light of these experimental observations.
机译:我们明确地证明,对于嵌入聚合物主体中的CdSe / ZnS量子点(QD),光致发光(PL)和电致发光(EL)的机理是不同的。随着QD浓度的增加,当施加的外加电流保持相同时,EL强度呈指数增加。相反,PL强度仅显示出对量子点浓度的线性依赖性。对于电致发光,直径为3.2 nm的量子点充当巨大的中心,在10-300 K的温度范围内具有几乎与温度无关的俘获横截面。提出了载流子俘获的现象学模型,其中空穴俘获由于主体中QD粒子的分布不均匀,因此截面呈指数分布。我们还表明,对于嵌入式QD的每个浓度,EL产量和有效载流子迁移率(μ_(eff))都具有相同的非阿伦尼乌斯温度依赖性。根据这些实验观察结果,讨论了空穴捕获机制的可能起源。

著录项

  • 来源
    《Organic Electronics》 |2012年第8期|p.1456-1462|共7页
  • 作者单位

    Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India, Samtel Centre for Display Technologies, Indian Institute of Technology Kanpur, Kanpur 208016, India;

    Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India ,Samtel Centre for Display Technologies, Indian Institute of Technology Kanpur, Kanpur 208016, India, Material Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016, India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum dots; polymers; photoluminescence; electroluminescence; traps;

    机译:量子点;聚合物光致发光电致发光陷阱;

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