This study presents the inkjet printing of a novel OLED device with fully solution-processed organic layers that employ TADF material as an emitting layer. The ink was formulated using new TADF material, triazine core carbazole dendrimers with tert-butyl group at the periphery (tBuG2TAZ), dissolved in a mixture of two non-chlorinated solvents. The influence of the print resolution and the substrate temperature on morphology of the printed films was studied and optimized in ambient conditions. The optimized TADF dendrimer layer was then incorporated in the OLEDs as the emitting layer. The best-printed OLEDs exhibited a maximum current efficiency of 18 cd/A and maximum luminance of 6900 cd/m². Such values are comparable to the values obtained in spin coated devices made of the same TADF dendrimer. Further, the mobility of charge carriers extracted from transient electroluminescence measurements of printed OLEDs, when compared to reference OLEDs made by spin coating technique, showed similar values. Finally, we have demonstrated the possibility of patterning of emission the area of complex shapes merely by selectively printing the emission layer. These results demonstrate the potential application of the new dendrimer TADF emitters for the fabrication of efficient OLEDs by an inkjet printing technique.

这项研究提出了一种新颖的OLED装置的喷墨印刷，该装置具有经过完全溶液处理的有机层，这些有机层采用TADF材料作为发光层。使用新的TADF材料，在外围具有叔丁基的三嗪核心咔唑树枝状聚合物（tBuG2TAZ）配制油墨，将其溶解在两种非氯化溶剂的混合物中。研究了印刷分辨率和基材温度对印刷薄膜形态的影响，并在环境条件下对其进行了优化。然后将优化的TADF树状聚合物层并入OLED中作为发光层。印刷效果最好的OLED的最大电流效率为18 cd / A，最大亮度为6900 cd / m ²。这样的值可与在由相同TADF树状聚合物制成的旋涂装置中获得的值相当。此外，与通过旋涂技术制成的参考OLED相比，从印刷OLED的瞬态电致发光测量中提取的电荷载流子的迁移率显示出相似的值。最后，我们证明了仅通过选择性地印刷发射层就可以对复杂形状的区域进行发射图案化的可能性。这些结果证明了新型树状聚合物TADF发射体在通过喷墨印刷技术制造高效OLED方面的潜在应用。