24509
The power density dependence of the QY is governed by the competition between the energy transfer upconversion ( ETU ) rate and the linear decay rate in the depopulation of the intermediate state of the involved activator in the upconversion process .
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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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