Provided is a method of producing a film excellent in external quantum efficiency when used in a light emitting layer of a light emitting device.
A film production method comprising
an ink preparation step of preparing an ink comprising a specific metal complex,
an ink storage step of storing the ink prepared in the ink preparation step for 3 days or more under light shielding, and
a film formation step of forming a film by an application method using the ink stored in the ink storage step and in which the total content of metal complexes having a molecular weight larger by 16, 32 or 48 than that of the specific metal complex according to the area percentage value determined by liquid chromatography is 0.6 or less when the content of the specific metal complex according to the area percentage value determined by liquid chromatography is taken as 100.
本发明提供了一种用于发光器件的发光层时外部量子效率极佳的薄膜的生产方法。
一种薄膜生产方法包括
油墨制备步骤:制备包含特定
金属复合物的油墨、
在遮光条件下将在油墨制备步骤中制备的油墨储存 3 天或更长时间的油墨储存步骤,以及
成膜步骤:使用在油墨储存步骤中储存的油墨,通过涂抹方法形成薄膜,其中,根据
液相色谱法确定的面积百分比值,分子量大于特定
金属络合物的分子量的 16、32 或 48 的
金属络合物的总含量为 0.6 或更少,而根据
液相色谱法确定的面积百分比值,特定
金属络合物的含量为 100。