Inkjet Printing of Mixed-Host Emitting Layer for Electrophosphorescent Organic Light-Emitting Diodes
Inkjet Printing of Mixed-Host Emitting Layer for Electrophosphorescent Organic Light-Emitting Diodes
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DOI：
10.1021/acsami.9b04675
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发表时间：
2019-06-19
影响因子：
9.5
通讯作者：
Chin, Byung Doo
中科院分区：
文献类型：
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作者：
Kang, You Jung;Bail, Robert;Chin, Byung Doo
我们研究了油墨配方对磷光有机发光二极管（PhOLED）中喷墨印刷小分子混合主体性能的影响。三（4-咔唑基-9-基苯基）胺（TCTA）与吡啶[3′，2′：4,5]呋喃[2,3-b]吡啶（3CzPFP）共混，改善了宿主溶解度、膜粗糙度和装置效率。在主机比为60:40 （TCTA/3CzPFP）时，亮度提高了33%，在1000 cd/m(2)时的效率滚降降至远低于10%，亮度半衰期（LT50）比单主机（100% TCTA）提高了80%。当采用喷墨打印沉积优化后的油墨时，在亮度为1000 cd/m(2)时，最大外量子效率为8.9%，电流效率为28.8 cd/ a。这相当于自旋铸造参考装置效率的84%左右。所得结果为喷墨打印混合主体的增强型光电二极管的设计提供了参考。
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/m(2) 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/m(2) 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.