You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
The molecule is a member of both the phosphorescent and high luminous efficiency classes and influences low driving voltage, light emission, and organic electroluminescence; additionally, it is electroluminescent. Use the above information to create a molecule.
user
c1ccc(-c2cc(-c3ccccc3)cc(-c3ccc4oc5ccc(-c6cc(-c7ccccc7)cc(-c7ccccc7)c6)cc5c4c3)c2)cc1
assistant