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首页> 外文期刊>Solid State Communications >Energy transfer from organic surface adsorbate-polyvinyl pyrrolidone molecules to luminescent centers in ZnS nanocrystals
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Energy transfer from organic surface adsorbate-polyvinyl pyrrolidone molecules to luminescent centers in ZnS nanocrystals

机译：能量从有机表面吸附物-聚乙烯吡咯烷酮分子转移到ZnS纳米晶体中的发光中心

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摘要

Multi-colour emitting doped ZnS nanocrystals surface capped with pyridine (P-ZnS) or polyvinyl pyrrolidone (PVP-ZnS) have been synthesized by wet chemical methods. The photoluminescence studies show that the dopant related emission from P-ZnS nanocrystals are caused by the energy transfer from band-to-band excitation of the host lattice. However, in the case of PVP capped ZnS, considerable enhancement in the emission intensity was observed and the corresponding excitation spectra appeared dramatically broadened due to the presence of multiple excitation bands with peak maxima at 235, 253, 260, 275, and 310 nm. The bands from 235 to 275 mm are assigned to the electronic transitions in the chemisorbed PVP molecules whereas the excitation maximum around 310 nm corresponds to the band-to-band transition within the nanocrystalline ZnS host. The presence of PVP related energy bands in the excitation spectrum indicates the process of energy transfer from the surface adsorbed PVP molecules to dopant centers in ZnS nanocrystals. This study brings out a heterogeneous sensitizer-activator relation between organic surface adsorbate and doped semiconducting nanocrystals. (C) 2003 Elsevier Ltd. All rights reserved. [References: 18]
机译：通过湿化学方法合成了被吡啶（P-ZnS）或聚乙烯吡咯烷酮（PVP-ZnS）覆盖的多色掺杂ZnS纳米晶体。光致发光研究表明，P-ZnS纳米晶体中与掺杂剂有关的发射是由主晶格的带间激发引起的能量转移引起的。但是，在PVP封口的ZnS的情况下，观察到发射强度的显着增强，并且由于存在多个激发带，且在235、253、260、275和310 nm处出现峰值最大值，因此相应的激发光谱似乎显着加宽。从235到275 mm的谱带分配给化学吸附的PVP分子中的电子跃迁，而在310 nm附近的最大激发对应于纳米晶体ZnS主体内的谱带跃迁。激发光谱中PVP相关能带的存在表明能量从表面吸附的PVP分子转移到ZnS纳米晶体中的掺杂剂中心。这项研究提出了有机表面吸附物和掺杂的半导体纳米晶体之间的异质敏化剂-活化剂关系。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：18]

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