Design, preparation and characterization of mixed semiconductor nanocrystal-salt crystals as extremely photostable and highly efficient light emitting materials for optical applications

混合半导体纳米晶体-盐晶体的设计、制备和表征，作为用于光学应用的极其光稳定和高效的发光材料

基本信息

批准号：
187261748
负责人：
Professor Dr. Alexander Eychmüller
金额：
--
依托单位：
Professur für Physikalische Chemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/187261748?language=en
关键词：
Design preparation characterization mixed semiconductor

项目摘要

Extremely high photoluminescence quantum yields (PL QY) and as high as possible photostability under application-relevant conditions are prerequisites for the use of semiconductor (SC) nanocrystals (NCs) as fluorescent labels and active components in optical devices. A typical approach to achieve and maintain a high PL QY is the encapsulation of SCNCs into robust and transparent matrices. For this purpose, we propose to use inorganic salt (e.g. NaCl, KCl, KJ, NH4J, etc.) crystals varying in crystal lattice and refractive index as matrices for embedding colloidal SCNCs of varying material composition and surface chemistry with emission in the visible and the infrared spectral region and the integration of these salt crystals into polymers. The protective and enhancing influence of inorganic salt crystals on the PL QY of SCNCs and their photostability was shown in first preliminary studies by us. The aim of the proposed project is the systematic study of the compatibility of our newly developed crystallization approaches with different types of SCNCs. Those will be prepared in aqueous and in organic solutions followed by characterization of the surface chemistries. We will apply sophisticated optical characterization methods, thereby comparing the optical properties and photochemical stability of the SCNCs in dispersion, in the salt matrix and, for selected systems, also as salt matrix-polymer composite materials. The NCs to be studied will include Cd-containing materials like CdTe; CdSe, CdHgTe or PbS and potentially less toxic materials like InP and CuInS(Se). Special emphasis will be dedicated to derive structure-property relations for the design of highly emissive and photostable SCNC-salt crystal composite structures potentially applicable for solid state lighting, luminescent solar concentrators as well as robust NIR and IR emission sources. For this purpose, we will also develop methods for the absolute measurement of PL QY of these differently scattering SCNC-salt crystal systems.

在应用相关条件下极高的光致发光量子产率 (PL QY) 和尽可能高的光稳定性是在光学器件中使用半导体 (SC) 纳米晶体 (NC) 作为荧光标记和有源组件的先决条件。实现和维持高 PL QY 的典型方法是将 SCNC 封装到稳健且透明的矩阵中。为此，我们建议使用晶格和折射率不同的无机盐（例如 NaCl、KCl、KJ、NH4J 等）晶体作为基质，嵌入不同材料成分和表面化学的胶体 SCNC，并在可见光和红外光谱区以及这些盐晶体整合到聚合物中。我们的第一个初步研究表明了无机盐晶体对 SCNCs 的 PL QY 及其光稳定性的保护和增强作用。拟议项目的目的是系统研究我们新开发的结晶方法与不同类型 SCNC 的兼容性。这些将在水溶液和有机溶液中制备，然后进行表面化学表征。我们将应用复杂的光学表征方法，从而比较 SCNC 在分散体、盐基体中以及对于选定的系统，以及盐基体-聚合物复合材料的光学性质和光化学稳定性。待研究的NC将包括CdTe等含镉材料； CdSe、CdHgTe 或 PbS 以及潜在毒性较小的材料，如 InP 和 CuInS(Se)。特别重点将致力于导出高发射性和光稳定 SCNC 盐晶体复合结构设计的结构-性能关系，这些结构可能适用于固态照明、发光太阳能聚光器以及强大的近红外和红外发射源。为此，我们还将开发这些不同散射 SCNC 盐晶体系统的 PL QY 绝对测量方法。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Rationally designed synthesis of bright AgInS2/ZnS quantum dots with emission control

合理设计合成明亮的 AgInS2/ZnS 量子点并控制发射

DOI：
10.1007/s12274-020-2876-8
发表时间：
2020
期刊：
Nano Research
影响因子：
9.9
作者：
Soares;Wegner;Ribeiro;D. S. M;Santos;J. L. M;Resch-Genger
通讯作者：
Resch-Genger

Synthesis of NIR‐Emitting InAs‐Based Core/Shell Quantum Dots with the Use of Tripyrazolylarsane as Arsenic Precursor

以三吡唑基二烷为砷前驱体合成 NIRâ 发射 InAsâ 基核/壳量子点

DOI：
10.1002/ppsc.201800175
发表时间：
2018
期刊：
Particle & Particle Systems Characterization
影响因子：
2.7
作者：
Tietze;Panzer;Starzynski;Guhrenz;Frenzel;Würth;Resch-Genger;Weigand;Eychmüller
通讯作者：
Eychmüller

Photoluminescence of Ag-In-S/ZnS quantum dots: Excitation energy dependence and low-energy electronic structure