Low‐Refractive Index Layers in Organic Light‐Emitting Diodes via Electrospray Deposition for Enhanced Outcoupling Efficiencies,Advanced Engineering Materials

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Low‐Refractive Index Layers in Organic Light‐Emitting Diodes via Electrospray Deposition for Enhanced Outcoupling Efficiencies
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-01-13 , DOI: 10.1002/adem.201900897
Thorsten Erich Umbach ₁ , Stefan Röllgen ₁ , Stefan Schneider ₁ , Heike Klesper ₁ , Anne Manuela Umbach ₂ , Klaus Meerholz ₁

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Organic light‐emitting diodes (OLEDs) still suffer from limited outcoupling efficiencies. Herein, a novel technology for the enhancement of the outcoupling efficiency of OLED devices is presented. By means of electrospray deposition (ESD), the active hole‐transport layer (HTL) is modified to have a reduced effective refractive index due to its porosity. A green‐emitting stack is tailored to demonstrate this effect, whereas additional haze effects are to be prevented. The introduction of a low‐index HTL results in a more efficient light extraction by a factor of 1.05 showing excellent agreement between experiment and simulation.

中文翻译：

通过电喷雾沉积降低有机发光二极管中的低折射率层，以提高耦合输出效率

有机发光二极管（OLED）仍然具有有限的输出耦合效率。在此，提出了用于提高OLED装置的输出耦合效率的新颖技术。通过电喷雾沉积（ESD），可以改变有源空穴传输层（HTL）的孔隙度，从而降低其有效折射率。量身定制的绿色发光堆栈可以证明这种效果，同时还应防止其他雾霾效应。低折射率HTL的引入使光提取效率提高了1.05倍，表明实验和仿真之间具有极好的一致性。

更新日期：2020-01-13

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