基于溶液法制备的高效率磷光有机发光二极管

High Efficient Solution-processed Phorescent Organic Light-emitting Diodes

摘要:

溶液法制备的有机发光二极管（OLED）虽然有着制作成本低、材料利用率高以及容易大规模生产等优势,但是在器件效率上离传统高温真空热蒸镀法制作的OLED还有很大差距。文章基于一种新型的磷光发光材料Ir（tfmppy）2（tpip）,在利用单一主体材料溶液法制备OLED时发现器件效率不高,同时效率滚降很大。为了提高器件效率,同时减小效率滚降,以多种材料混合作为主体材料。通过改变混合主体材料间的比例关系,以一种简单的器件结构,采用溶液法制作出了高效率的OLED器件。其中,以质量比为7∶21∶12的PVK∶mCP∶TCTA为混合主体材料,掺杂质量比为10%的Ir（tfmppy）2（tpip）作为发光层的器件,取得了高达55cd/A的电流效率。

Abstract:

Although solution-processed organic light-emitting diodes (OLEDs) have lots of advantages, such as low cost, efficient use of materials and large area manufacturability, the low efficiency great limits its development. In this paper, utilizing a newly synthesized phosphor Ir(tfmppy)2(tpip), a high efficient solution-processed OLED was demonstrated via changing the ratio of different host materials. A high current efficiency of 55cd/A was achieved when doping 10% Ir(tfmppy)2(tpip) as the emissive layer into PVK∶mCP∶TCTA (7∶21∶12) as the hybrid host material.