Using spectral-kinetic data obtained for nanoassemblies based on CdSe/ZnS semiconductor quantum dots and tetrapyridylporphyrin molecules in methylcyclohexane-toluene mixture 6:1, it was justified that the temperature lowering is accompanied by conformational transformation of the surface ligand (trioctylphosphine oxide or amine) layer in individual quantum dots, which is accelerated in nanoassemblies. It has been shown for the CdSe/ZnS quantum dots that he states determining the absorption band of the first exciton transition, on the one hand, and the photoluminescence band, on the other hand, have different natures. In the frames of existing models for exciton-phonon coupling in semiconductor nanostructures, an analysis has been carried out for the temperature dependence (77–293 K) of quantum dot absorption and photoluminescence properties taking into account conformational effects. It has been established that the formation of the absorption band for the first exciton transition takes place with participation of CdSe core LO phonons, while photoluminescence properties reflect also additional interactions with ZnS shell LO phonons.

中文翻译：

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基于 CdSe/ZnS 半导体量子点和卟啉分子的纳米复合材料中的弛豫过程和激子-声子相互作用

使用基于 CdSe/ZnS 半导体量子点和四吡啶基卟啉分子在甲基环己烷 - 甲苯混合物 6:1 中获得的纳米组件的光谱动力学数据，证明温度降低伴随着表面配体（三辛基膦氧化物或胺）的构象转变是合理的单个量子点中的层，在纳米组件中加速。已经表明，对于 CdSe/ZnS 量子点，他声明一方面决定了第一激子跃迁的吸收带，另一方面，光致发光带具有不同的性质。在半导体纳米结构中激子-声子耦合的现有模型的框架中，考虑到构象效应，对量子点吸收和光致发光特性的温度依赖性 (77-293 K) 进行了分析。已经确定，第一激子跃迁的吸收带的形成是在 CdSe 核心 LO 声子的参与下发生的，而光致发光特性也反映了与 ZnS 壳层 LO 声子的额外相互作用。