29601
In the monolayer limit , transition metal dichalcogenides become direct - bandgap , light - emitting semiconductors .
 Chemical: transition metal dichalcogenides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: transition metal dichalcogenides