Triplet Energy Transfer from PbS(Se) Nanocrystals to Rubrene: the Relationship between the Upconversion Quantum Yield and Size
Triplet Energy Transfer from PbS(Se) Nanocrystals to Rubrene: the Relationship between the Upconversion Quantum Yield and Size
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DOI：
10.1002/adfm.201505623
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发表时间：
2016-09
影响因子：
19
通讯作者：
Melika Mahboub;Hadi Maghsoudiganjeh;Andrew Minh Pham;Zhiyuan Huang;M. Tang
中科院分区：
文献类型：
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作者：
Melika Mahboub;Hadi Maghsoudiganjeh;Andrew Minh Pham;Zhiyuan Huang;M. Tang
光子上转换由于其在生物成像、生物成像，特别是光子学中的广泛应用而引起了人们的极大关注。在这里，研究了量子限制对从PbS和PbSe纳米晶体（NC）到红荧烯受体的德克斯特能量转移效率的影响。一系列的实验探索NC尺寸和上转换量子产率（QY）在这个混合平台之间的关系表明，能量转移发生在马库斯正常制度。通过将PbS的NC直径从3.5 nm减小到2.9 nm以及将PbSe的NC直径从3.2 nm减小到2.5 nm，相对上转换QY分别增强约700倍和250倍。此外，红荧烯猝灭PbSe纳米粒子的动态Stern-Volmer常数（KSV）随着纳米粒子直径从3.2 nm减小到2.5 nm，增加了约5倍，减小到200 m−1。这项工作表明，高质量、良好钝化的小NC对于有效的三重态能量转移到分子受体至关重要。
Photon upconversion has attracted enormous attention due to its wide range of applications in biological imaging, photocatalysis, and especially photovoltaics. Here, the effect of quantum confinement on the efficiency of Dexter energy transfer from PbS and PbSe nanocrystals (NCs) to a rubrene acceptor is studied. A series of experiments exploring the relationship between NC size and the upconversion quantum yield (QY) in this hybrid platform show that energy transfer occurs in the Marcus normal regime. By decreasing the NC diameter from 3.5 to 2.9 nm for PbS and from 3.2 to 2.5 nm for PbSe, the relative upconversion QY is enhanced about 700 and 250‐fold respectively. In addition, the dynamic Stern–Volmer constant (KSV) for the quenching of PbSe NCs by rubrene increases approximately fivefold with a decrease in NC diameter from 3.2 to 2.5 nm to a value of 200 m−1. This work shows that high quality, well‐passivated, small NCs are critical for efficient triplet energy transfer to molecular acceptors.