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In this work , theoretical derivations , DFT calculations , X - ray - diffraction , photoluminescence spectroscopy , and the time - dependent single - photon - counting - technique ( TDSPC ) were used to understand this phenomenon more deeply .
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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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