Nanocrystal Size and Quantum Yield in the Upconversion of Green to Violet Light with CdSe and Anthracene Derivatives
Nanocrystal Size and Quantum Yield in the Upconversion of Green to Violet Light with CdSe and Anthracene Derivatives
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DOI：
10.1021/acs.chemmater.5b03731
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发表时间：
2015-11-10
影响因子：
8.6
通讯作者：
Tang, Ming L.
中科院分区：
文献类型：
--
作者：
Huang, Zhiyuan;Li, Xin;Tang, Ming L.
我们研究了影响可见光上转换的参数在混合有机无机系统的基础上的CdSe双（NC）敏化剂，9-蒽羧酸（9-ACA）的发射器，和二苯基蒽（DPA）湮灭。七个纤锌矿型CdSe纳米粒子的光致发光量子产率（PLQY）范围为2.0%至11%，直径为2.7至5.1 nm，与9-ACA和DPA分子组合使用。使用2.7 nm直径的CdSe NC，我们表明，上转换量子产率有一个二次线性依赖于NC敏化剂浓度。此外，上转换效率与9-ACA的表面覆盖度的CdSe NC和NC PLQY，但呈负相关的颗粒大小。这项工作清楚地说明了设计具有高上转换效率的纳米晶体-分子组合的途径，这些组合在生物成像、太阳能转换和数据存储领域具有潜在的应用。
We investigate the parameters affecting the upconversion of visible light in a hybrid organic inorganic system based on CdSe nanocrystal (NC) sensitizers, 9-anthracene carboxylic acid (9-ACA) transmitter, and diphenylanthracene (DPA) annihilator. Seven wurtzite CdSe NCs ranging in photoluminescence quantum yield (PLQY) from 2.0% to 11%, and in diameter from 2.7 to 5.1 nm, were used in combination with the 9-ACA and DPA molecules. Using 2.7 nm diameter CdSe NCs, we show that the upconversion quantum yield has a quadratic to linear dependence on NC sensitizer concentration. Additionally, upconversion efficiency correlates positively with 9-ACA surface coverage on CdSe NCs and NC PLQY but negatively with particle size. This work clearly illustrates the path toward designing nanocrystal-molecule combinations with high upconversion efficiency that have potential applications in the fields of bioimaging, solar energy conversion, and data storage.