Inkjet Printing of Mixed-Host Emitting Layer for Electrophosphorescent Organic Light-Emitting Diodes,ACS Applied Materials & Interfaces

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Inkjet Printing of Mixed-Host Emitting Layer for Electrophosphorescent Organic Light-Emitting Diodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-05-27 00:00:00 , DOI: 10.1021/acsami.9b04675
You Jung Kang , Robert Bail , Chil Won Lee ₁ , Byung Doo Chin

Affiliation

We have investigated the impact of the ink formulation on the properties of an inkjet-printed small molecular mixed host in a phosphorescent organic light-emitting diode (PhOLED). Host solubility, film roughness, and device efficiency improved by blending tris(4-carbazoyl-9-ylphenyl)amine (TCTA) with pyrido[3′,2′:4,5]furo[2,3-b]pyridine (3CzPFP). At a host ratio of 60:40 (TCTA/3CzPFP), the brightness increased by 33%, the efficiency roll-off at 1000 cd/m² dropped to well below 10%, and the luminance half-lifetime (LT₅₀) improved by 80% in comparison to the device with a single host (100% TCTA). When the optimized ink was deposited by inkjet printing, a maximum external quantum efficiency of 8.9% and a current efficiency of 28.8 cd/A were achieved at 1000 cd/m² brightness. This amounted to around 84% of the efficiency of a spin-cast reference device. The obtained results provide a blueprint for designing enhanced PhOLEDs with inkjet-printed mixed hosts.

中文翻译：

用于电致磷光有机发光二极管的混合主体发光层的喷墨印刷

我们已经研究了油墨配方对磷光有机发光二极管（PhOLED）中喷墨印刷的小分子混合基质的性能的影响。通过将三（4-咔唑基-9-基苯基）胺（TCTA）与吡啶并[3'，2'：4,5]呋喃[2,3- b ]吡啶（3CzPFP）掺混可以改善主体溶解度，膜粗糙度和器件效率）。在主体比率为60:40（TCTA / 3CzPFP）时，亮度增加了33％，在1000 cd / m ^2时的效率下降降至10％以下，并且亮度半衰期（LT ₅₀）得到改善与具有单个主机的设备（100％TCTA）相比，降低了80％。通过喷墨打印沉积优化的墨水时，在1000 cd / m的情况下，最大外部量子效率为8.9％，电流效率为28.8 cd / A。²亮度。这大约相当于旋转浇铸参考设备效率的84％。获得的结果为设计具有喷墨印刷的混合基质的增强型PhOLED提供了一个蓝图。

更新日期：2019-05-27

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