Observation of a new type of aggregation-induced emission in nanoclusters.
Observation of a new type of aggregation-induced emission in nanoclusters.
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纳米团簇中新型聚集诱导发射的观察
DOI：
10.1039/c7sc05317g
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发表时间：
2018-03-21
期刊：
影响因子：
8.4
通讯作者：
Zhu M
中科院分区：
文献类型：
--
作者：
Kang X;Wang S;Zhu M
提出了一种新的聚集诱导发光机制，定义为配体的解离-聚集过程的限制在纳米团簇范围内。聚集诱导发光（AIE）是纳米团簇研究领域中一种常用的增强光致发光（PL）的方法。以前关于聚集诱导的NCs荧光增强的报道大多是由分子内运动限制（RIM）引起的。在这项工作中，一个新的机制，涉及限制的“解离-聚集模式”的配体使用Ag 29（BDT）12（TPP）4 NC（BDT：1，3-苯二硫醇; TPP：三苯基膦）作为模型。通过在Ag 29（BDT）12（TPP）4的N，N-二甲基甲酰胺溶液中加入TPP，由于TPP的解离-聚集过程受到限制，Ag 29（BDT）12（TPP）4 NC的荧光强度可显著增强13倍，量子产率从0.9%提高到11.7%。这一新的机制进一步验证了低温PL研究。与Ag 29（BDT）12（TPP）4 NC的显著的PL增强不同，非解离的Pt 1Ag 28（S-Adm）18（TPP）4 NC（S-Adm：1-金刚烷乙氧基化物）在相同的TPP添加条件下表现出保持的PL强度。总体而言，这项工作提出了一个新的机制，大大提高了PL的NC通过调制配体的解离NC表面，这是完全不同的，从以前报道的AIE现象在NC领域。
A novel mechanism of aggregation-induced emission defined as the restriction of the ligand dissociation–aggregation process in the nanocluster range is proposed. The strategy of aggregation-induced emission (AIE) has been widely used to enhance the photo-luminescence (PL) in the nanocluster (NC) research field. Most of the previous reports on aggregation-induced enhancement of fluorescence in NCs are induced by the restriction of intramolecular motion (RIM). In this work, a novel mechanism involving the restriction of the “dissociation–aggregation pattern” of ligands is presented using a Ag29(BDT)12(TPP)4 NC (BDT: 1,3-benzenedithiol; TPP: triphenylphosphine) as a model. By the addition of TPP into an N,N-dimethylformamide solution of Ag29(BDT)12(TPP)4, the PL intensity of the Ag29(BDT)12(TPP)4 NC could be significantly enhanced (13 times, quantum yield from 0.9% to 11.7%) due to the restricted TPP dissociation–aggregation process. This novel mechanism is further validated by a low-temperature PL study. Different from the significant PL enhancement of the Ag29(BDT)12(TPP)4 NC, the non-dissociative Pt1Ag28(S-Adm)18(TPP)4 NC (S-Adm: 1-adamantanethiol) exhibits a maintained PL intensity under the same TPP-addition conditions. Overall, this work presents a new mechanism for largely enhancing the PL of NCs via modulating the dissociation of ligands on the NC surface, which is totally different from the previously reported AIE phenomena in the NC field.
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影响因子：
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