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The results in this paper provide a method to fully describe the QY of upconverting nanoparticles for arbitrary excitation power densities , and is a fast and simple approach for assessing the applicability of UCNPs from the perspective of energy conversion .
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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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