9948
A series of 1 , 8 - naphthalimide derivatives has been designed to explore their optical , electronic , and charge transport properties as charge transport and / or luminescent materials for organic light - emitting diodes ( OLEDs ) .
 Chemical: 1 , 8 - naphthalimide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 1 , 8 - naphthalimide