Device performance and polymer morphology in polymer light emitting diodes: The control of thin film morphology and device quantum efficiency
Device performance and polymer morphology in polymer light emitting diodes: The control of thin film morphology and device quantum efficiency
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DOI：
10.1063/1.373062
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发表时间：
2000-04
影响因子：
3.2
通讯作者：
Yijian Shi;Jiankang Liu;Yang Yang-Yang
中科院分区：
文献类型：
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作者：
Yijian Shi;Jiankang Liu;Yang Yang-Yang
我们提出了一个系统的研究结果如何旋转浇铸的工艺条件影响聚合物薄膜的形态，以及形态如何影响聚合物发光二极管（LED）的性能。聚（2-甲氧基-5-（2′-乙基己氧基）-1，4-苯撑乙烯基）（MEH-PPV）薄膜的吸收峰反映了π电子的共轭性质，其吸收峰与旋涂条件密切相关。在高旋转速度下，观察到更好的共轭。此外，MEH-PPV薄膜的光致发光发射峰在λ 630 nm处与聚合物的聚集有很强的相关性。通过适当选择有机溶剂、聚合物溶液浓度和纺丝速度，我们能够控制聚合物链的聚集。随后，我们能够通过简单地调节旋转浇铸条件来控制MEH-PPV LED的发射颜色和量子效率。虽然旋转流延是最常用的聚合物薄膜制备技术，我们的鳍...
We present the results of a systematic study on how the processing conditions of spin casting affect the morphology of polymer thin films, and how the morphology affects polymer light-emitting diode (LED) performance. The absorption peaks of poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1, 4-phenylene vinylene) (MEH-PPV) thin films, which reflects the conjugation of π electrons, are strongly correlated to the spin-casting conditions. At high spin speed, better conjugation is observed. In addition, the photoluminescence emission peak of MEH-PPV films at ∼630 nm has a strong correlation to polymer aggregation. By proper selection of organic solvents, polymer solution concentrations, and spin speeds, we are able to control the aggregation of the polymer chains. Subsequently, we are able to control the emission color and the quantum efficiency of the MEH-PPV LEDs by simply adjusting the spin-casting conditions. Although spin casting is the most commonly used technique for the preparation of polymer thin films, our fin...