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首页> 外文会议>Conference on organic light emitting materials and devices >Molecular orientation, thermal behavior and density of electron and hole transport layers and the implication on device performance for OLEDs
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Molecular orientation, thermal behavior and density of electron and hole transport layers and the implication on device performance for OLEDs

机译：电子和空穴传输层的分子取向，热行为和密度及其对OLED器件性能的影响

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Recent progress has shown that molecular orientation in vapor-deposited glasses can affect device performance. The deposition process can result in films where the molecular axis of the glass material is preferentially ordered to lie parallel to the plane of the substrate. Here, materials made within Dow's Electronic Materials business showed enhanced performance when the orientation of the molecules, as measured by variable angle spectroscopic ellipsometry, was oriented in a more parallel fashion as compared to other materials. For one material, the anisotropic packing was observed in the as-deposited glass and was isotropic for solution-cast and annealed films. In addition, the density of an as-deposited N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine (NPD) film was 0.8% greater than what was realized from slowly cooling the supercooled liquid. This enhanced density indicated that vapor-deposited molecules were packing more closely in addition to being anisotropic. Finally, upon heating the NPD film into the supercooled liquid state, both the density and anisotropic packing of the as-deposited glass was lost.
机译：最近的进展表明，气相沉积玻璃中的分子取向会影响器件性能。沉积过程可导致薄膜，其中玻璃材料的分子轴优先排列为平行于基板的平面。在这里，与其他材料相比，当通过可变角度光谱椭圆偏光法测量的分子取向以更平行的方式取向时，陶氏电子材料业务部门制造的材料表现出更高的性能。对于一种材料，在沉积后的玻璃中观察到各向异性堆积，而对于溶液流延和退火薄膜则各向同性。另外，沉积的N，N'-双（萘-1-基）-N，N'-双（苯基）-2,2'-二甲基联苯胺（NPD）薄膜的密度比薄膜的密度高0.8％。通过缓慢冷却过冷的液体来实现。这种增加的密度表明，除了各向异性之外，气相沉积的分子堆积得更紧密。最后，在将NPD膜加热到过冷液态时，沉积玻璃的密度和各向异性堆积都损失了。

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