量子点
电荷(物理)
壳体(结构)
芯(光纤)
材料科学
传输(计算)
纳米技术
化学
复合材料
物理
计算机科学
并行计算
量子力学
作者
Zhiyuan Huang,Zihao Xu,Melika Mahboub,Xin Li,Jordan W. Taylor,W. Hill Harman,Tianquan Lian,Ming Lee Tang
标识
DOI:10.1002/anie.201710224
摘要
Abstract A sub‐monolayer CdS shell on PbS quantum dots (QDs) enhances triplet energy transfer (TET) by suppressing competitive charge transfer from QDs to molecules. The CdS shell increases the linear photon upconversion quantum yield (QY) from 3.5 % for PbS QDs to 5.0 % for PbS/CdS QDs when functionalized with a tetracene acceptor, 5‐CT . While transient absorption spectroscopy reveals that both PbS and PbS/CdS QDs show the formation of the 5‐CT triplet (with rates of 5.91±0.60 ns −1 and 1.03±0.09 ns −1 respectively), ultrafast hole transfer occurs only from PbS QDs to 5‐CT . Although the CdS shell decreases the TET rate, it enhances TET efficiency from 60.3±6.1 % to 71.8±6.2 % by suppressing hole transfer. Furthermore, the CdS shell prolongs the lifetime of the 5‐CT triplet and thus enhances TET from 5‐CT to the rubrene emitter, further bolstering the upconverison QY.
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