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首页> 外文期刊>Japanese Journal of Applied Physics. Part 2, Letters & Express Letters >Improvement in Polymer Light-Emitting Diode Performance Using Polymer Heterojunction Structure Prepared by Evaporative Spray Deposition from Ultradilute Solution
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Improvement in Polymer Light-Emitting Diode Performance Using Polymer Heterojunction Structure Prepared by Evaporative Spray Deposition from Ultradilute Solution

机译：利用超稀溶液的蒸发喷涂沉积制备的聚合物异质结结构改善聚合物发光二极管的性能

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摘要

We successfully demonstrated a significant improvement in polymer light-emitting diode performance by employing a polymer bilayer structure prepared by evaporative spray deposition from ultradilute solution (ESDUS). The bilayer structure consisted of two π-conjugated polymers, where the top layer was deposited from tetrahydrofuran (THF) solution by ESDUS onto the preceding bottom layer composed of the other THF-soluble polymer. The external quantum efficiency (EQE) of the bilayer device is improved markedly in comparison with that of a corresponding single-layer device prepared by conventional spin-coating. Moreover, the EQE of the bilayer device tends to be constant throughout a wide current region, whereas that of single-layer devices increases gradually with current density. These observations indicate that carriers are effectively blocked at the polymer/polymer interface of the bilayer device.
机译：我们通过采用由超稀溶液（ESDUS）进行蒸发喷雾沉积制备的聚合物双层结构，成功地证明了聚合物发光二极管性能的显着改善。双层结构由两种π共轭聚合物组成，其中顶层通过ESDUS从四氢呋喃（THF）溶液中沉积到由另一种THF可溶性聚合物组成的先前的底层上。与通过常规旋涂制备的相应单层器件相比，双层器件的外部量子效率（EQE）显着提高。此外，双层器件的EQE在整个宽电流区域内趋于恒定，而单层器件的EQE随着电流密度逐渐增加。这些观察结果表明，载体在双层装置的聚合物/聚合物界面处被有效地封闭。

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