25995
Electrically pumped lasing action has been realized in ZnO from an n - MgZnO / i - ZnO / SiO2 / p - Si asymmetric double heterostructure , an ultralow threshold of 3 . 9 mA was obtained .
 Chemical: ZnO; Chemical: MgZnO; Chemical: ZnO; Chemical: SiO2; Chemical: Si
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: ZnO; Chemical: MgZnO; Chemical: ZnO; Chemical: SiO2; Chemical: Si