9627
The emission full width at half - maximum of the resulting Pdots varies from 40 to 55 nm , which is 1 . 5 - 2 times narrower than those of conventional semiconducting polymer dots .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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