Complete Suppression of Blinking and Reduced Photobleaching in Single MEH-PPV Chains in Solution
Complete Suppression of Blinking and Reduced Photobleaching in Single MEH-PPV Chains in Solution
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DOI：
10.1021/jz2012512
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发表时间：
2011-10
影响因子：
5.7
通讯作者：
Suguru Onda;H. Kobayashi;T. Hatano;Shu Furumaki;S. Habuchi;M. Vacha
中科院分区：
文献类型：
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作者：
Suguru Onda;H. Kobayashi;T. Hatano;Shu Furumaki;S. Habuchi;M. Vacha
我们报告了聚苯乙烯浓溶液中共轭聚合物 MEH-PPV 各个链的光物理性质。 MEH-PPV 链在溶液中自由扩散，没有显示荧光闪烁和光漂白减少。链吸附到溶液中的底物上导致荧光强度（量子效率）降低 34%，光漂白和眨眼出现率增加五倍。眨眼通常是由与单个猝灭剂的可逆相互作用引起的两种状态过程。这种相互作用导致延长的 MEH-PPV 链的相当长的长度被猝灭。
We report photophysical properties of individual chains of the conjugated polymer MEH-PPV in a concentrated solution of polystyrene. MEH-PPV chains diffusing freely in the solution show no fluorescence blinking and reduced photobleaching. Adsorption of the chains onto a substrate in the solution leads to 34% decrease in fluorescence intensity (quantum efficiency), five-fold increase in the rate of photobleaching and appearance of blinking. The blinking is often a two-state process caused by a reversible interaction with a single quencher. The interaction causes quenching of a substantial length of the extended MEH-PPV chain.