11801
A vibrational PL feature was observed in all samples with an energy separation of about 0 . 192 +/- 0 . 013 eV , which was explained based on electron - phonon coupling .
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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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