The terms used in this specification are just for explaining exemplary embodiments and it is not intended to restrict the present disclosure. The singular expression may include the plural expression unless it is differently expressed contextually. It must be understood that the term “include”, “equip”, or “have” in the present specification is only used for designating the existence of characteristics taken effect, numbers, steps, components, or combinations thereof, and do not exclude the existence or the possibility of addition of one or more different characteristics, numbers, steps, components, or combinations thereof beforehand.

Further, in the present specification, when a layer or an element is mentioned to be formed “on” or “above” layers or elements, it means that each layer or element is directly formed on the layers or elements, or other layers or elements may be formed between the layers, subjects, or substrates.

The present disclosure may be variously modified and have various forms, and specific examples are exemplified and explained in detail below. However, it is not intended to limit the present disclosure to the specific examples and it must be understood that the present disclosure includes every modifications, equivalents, or replacements included in the spirit and technical scope of the present disclosure.

Meanwhile, as used herein, the term ‘screening method’, which is a method of selecting or exploring a desired material among various candidates, refers to a method of selecting or exploring a material that enables a device to exhibit excellent characteristics by calculating specific parameter values with respect to candidates without examining characteristics of organic light emitting devices manufactured by using various candidates which are applicable to the organic light emitting device.