CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Korean Patent Application No. 10-2018-0066766 filed in the Republic of Korea on Jun. 11, 2018, which is hereby incorporated by reference in its entirety.

BACKGROUND

Field of Technology

The present disclosure relates to an electroluminescent compound, and more particularly, to an electroluminescent compound having an improved lifespan and emitting efficiency and an electroluminescent device including the same.

Discussion of the Related Art

The electroluminescent (EL) device is formed on a transparent substrate and can be operated at a voltage (e.g., 10V or below) lower than a voltage required to operate other display devices, e.g., plasma display panels. In addition, the EL device has lower power consumption and excellent color purity. Moreover, since the EL device can emit red light, green light and blue light, the EL device is developed as next generation display device.

To provide the above advantages, a material including, e.g., a hole injection material, a hole transporting material, an emitting material, an electron transporting material or an electron injection material, having high reliability and efficiency is needed. However, the materials in the prior art are insufficient, and a new material is required.

Recently, not only is there a need for enhancing the properties of an EL device by changing the material in an organic layer but also a need for enhancing the color purity and the emitting efficiency by optimizing an optical thickness between the anode an the cathode. For example, a capping layer may be used on an electrode to enhance the color purity and the emitting efficiency of the EL device.

The development of the device structure and new material for enhancing the emitting property of the EL device is required.

SUMMARY

The present invention is directed to an EL compound and an EL device including the same that substantially obviate one or more of the problems associated with the limitations and disadvantages of the related conventional art.

Additional features and advantages of the disclosure are set forth in the description which follows, and will be apparent from the description, or evident by practice of the invention. The objectives and other advantages of the invention are realized and attained by the features described herein as well as in the appended drawings.

To achieve these and other advantages in accordance with the purpose of the embodiments of the invention, as described herein, an aspect of the invention is an electroluminescent compound of Formula 1 or Formula 2:


wherein each of X1to X4is independently N or CR′, wherein each of R and R′ is independently selected from the group consisting of hydrogen, deuterium, cyano group, hydroxyl group, halogen, substituted or non-substituted C1 to C10 alkyl group, substituted or non-substituted C6 to C20 aryl group and substituted or non-substituted C3 to C30 heteroaryl group, wherein each of L1and L2is independently selected from a single bond, substituted or non-substituted C6 to C20 arylene group and substituted or non-substituted C3 to C30 heteroarylene group, and wherein each of Art and Are is independently selected from the group consisting of substituted or non-substituted C6 to C20 aryl group and substituted or non-substituted C3 to C30 heteroaryl group.

Another aspect of the invention is an electroluminescent device including a first electrode; a second electrode facing the first electrode; and at least one organic material layer between the first and second electrodes, wherein one or more of the at least one organic material layer includes the electroluminescent compound.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to further explain the invention as claimed.

