通过膦表面钝化来调谐 CdSe 纳米团簇的发光性质。

Tuning luminescent properties of CdSe nanoclusters by phosphine surface passivation.

机构信息

Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine. Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de pharmacie, 74 route du Rhin, 67401 ILLKIRCH Cedex, France. These authors equally contributed to the work.

出版信息

Methods Appl Fluoresc. 2016 Nov 25;4(4):044009. doi: 10.1088/2050-6120/4/4/044009.

DOI:10.1088/2050-6120/4/4/044009

PMID:28192302

Abstract

Appropriate surface ligands are required for tuning the physicochemical and photophysical properties of nanoclusters (NCs). These surface ligands are especially critical for passivating the small (CdSe) NCs where the majority of atoms are at the NC surface. In this study, triphenylphosphine (TPP), trioctylphosphine (TOP) and tris(pentafluorophenyl)phosphine (TPFP) have been tested as capping agents for alkylamine-coated CdSe NCs. TPP and TOP compounds are found to increase the quantum yield of photoluminescence (PL) from 0.15% to 0.6% and 0.53%, respectively, and to preserve this increased PL with time, probably by preventing charge leakage as a result of their binding to Se atoms. Since no dramatic change in the shape of NCs' PL spectrum occurs after surface treatment, both the exciton band and the low-energy broad band in magic NCs are thought to describe the intrinsic luminescence properties of the NCs. As a result, the PL increase due to Se passivation is thought to be mainly caused by a decrease in the efficiency of the NC nonradiative pathways.

摘要

适当的表面配体对于调整纳米团簇（NCs）的物理化学和光物理性质是必需的。这些表面配体对于钝化大多数原子位于 NC 表面的小（CdSe）NCs 尤为重要。在这项研究中，三苯基膦（TPP）、三辛基膦（TOP）和三（五氟苯基）膦（TPFP）已被测试为烷基胺包覆的 CdSe NCs 的封端剂。发现 TPP 和 TOP 化合物分别将光致发光（PL）的量子产率从 0.15%提高到 0.6%和 0.53%，并随着时间的推移保持这种增加的 PL，这可能是由于它们与 Se 原子结合而防止了电荷泄漏。由于表面处理后 NCs 的 PL 光谱形状没有发生明显变化，因此认为激子带和魔术 NCs 中的低能宽带描述了 NCs 的固有发光性质。因此，由于 Se 钝化而导致的 PL 增加主要归因于 NC 非辐射途径效率的降低。