The role of oxygen‐induced processes on the emission characteristics of single molecule emitters
The role of oxygen‐induced processes on the emission characteristics of single molecule emitters
复制标题
氧诱导过程对单分子发射体发射特性的作用
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Wrachtrup
中科院分区：
文献类型：
--
作者：
Maximilian Nothaft;Steffen Höhla;F. Jelezko;J. Pflaum;J. Wrachtrup
单分子研究仅限于插入到各自宿主材料中的一类有机染料分子。合适的材料组合的基本要求包括高光子发射率和长期光稳定性。大多数已知的芳香主-客体系统采用结晶有机基质来防止染料分子与污染物发生不受控制的反应。然而，就器件制造和技术潜力而言，通常希望使用聚合物作为室温宿主基质。不幸的是，室温下聚合物中的单染料分子研究通常报告的光稳定性比其晶体分子对应物低几个数量级，导致对有机薄膜应用的兴趣降低。在本报告中，我们示范了在室温下将二苯并涤纶染料分子稀释成具有极低光漂白概率的聚合物聚-（对-苯基-乙烯基）（PPV）的基础上设计主客体体系的可行性。通过控制制造过程中的氧暴露，光漂白前的发射光子数量从106个显著增加到1011个。采用合适的封装技术来防止主客体制备后氧气的渗透，可以实现数月至数年的长时间光稳定器件。因此，这种方法为研究具有足够计数率和室温下长期稳定性的有机电子器件和纳米结构聚合物薄膜内的单分子量子发射器提供了各种新的基于主客体系统的聚合物组合。
Single molecule studies are limited to a defined class of organic dye molecules inserted into respective host materials. Basic requirements for suited material combinations include high photon emission rates and long term photostability. A majority of known aromatic host–guest systems employ crystalline organic matrices to prevent dye molecules from uncontrolled reactions with contaminants. However, in terms of device fabrication and technological potentials it is often desirable to use polymers as room temperature host matrices. Unfortunately, single dye molecule investigations in polymers at room temperature usually report orders of magnitude lower photostabilities compared to their crystalline molecular counterparts, leading to a reduced interest in organic thin film applications. In this report, we exemplary demonstrate the feasibility of engineering a host–guest system based on dibenzoterrylene dye molecules which were diluted into the polymer poly‐(p‐phenylene‐vinylene) (PPV) possessing very low photobleaching probabilities at room temperature. By controlling the oxygen exposure during manufacturing the number of emitted photons prior to photobleaching was significantly increased from 106 up to 1011 photons. Employing suited encapsulation techniques to prevent oxygen penetration after host–guest preparation, photostable devices over prolonged time periods on the order of months to years could be achieved. Therefore, this approach grants access to a variety of new polymer based combinations of host–guest systems for studying single molecular quantum emitters inside organic electronic devices and nanostructured polymer films with sufficient count rates and long‐term stability at room temperature.