具有显着圆极化电致发光的基于镧系元素的OLED的设计,Advanced Functional Materials

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具有显着圆极化电致发光的基于镧系元素的OLED的设计
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-11-03 , DOI: 10.1002/adfm.201603719
Francesco Zinna ₁ , Mariacecilia Pasini ₂ , Francesco Galeotti ₂ , Chiara Botta ₂ , Lorenzo Di Bari ₁ , Umberto Giovanella ₂

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能够直接发射圆偏振（CP）电致发光（CP-OLED）的有机发光二极管（OLED）迅速受到人们的关注，因为它们可能会应用于带有防眩光滤镜和3D显示器的显示器。由于CP光的变化可能与被照射组织的健康状况有关，因此开发更高效的CP-OLED还可在现场护理和个性化诊断工具中使用它们。这项工作表明，基于手性euro配合物的CP-OLED的性能可以在外部量子效率（在所有Eu谱带上测量）和发射光子的偏振度（通过不对称因子测量）方面得到改善。摹_EL），适当的有源层配方以及对设备架构的微调。获得的极化性能（g _EL = -1）约为迄今为止报道的任何其他CP-OLED的三倍。此外，首次显示了重组区（RZ）的位置在极化结果中起主要作用。为了使这些结果合理化，光偏振的水平与RZ的位置有关，并通过一个简单的数学模型将其反射到阴极上。该模型预测的值与实验值定性一致。

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Design of Lanthanide‐Based OLEDs with Remarkable Circularly Polarized Electroluminescence

Organic light‐emitting diodes (OLEDs) able to directly emit circularly polarized (CP) electroluminescence (CP‐OLEDs) are rapidly gaining much interest, due to their possible applications in displays with antiglare filters and 3D displays. Development of more efficient CP‐OLEDs can open their use also in point‐of‐care and personalized diagnostic tools, since CP light alteration can be related to health state of irradiated tissues. In this work it is shown that the performance of chiral europium complex‐based CP‐OLEDs can be improved both in terms of external quantum efficiency (measured on all the Eu bands) and degree of polarization of emitted photons (as measured by the dissymmetry factor g_EL), by proper active layer formulation and through a fine tuning of the architecture of the device. Polarization performances (g_EL = −1) are obtained about three times higher than for any other CP‐OLED reported so far. Moreover, for the first time, it is shown that the position of the recombination zone (RZ) plays a major role on the polarization outcomes. In order to rationalize these results the level of light polarization is related to the position of the RZ allied with the reflection on the cathode through a simple mathematical model. The values predicted by this model are in qualitative agreement with the experimental ones.

更新日期：2016-11-03

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