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Up - conversion luminescence in rare earth ions ( REs ) doped nanoparticles has attracted considerable research attention for the promising applications in solid - state lasers , three - dimensional displays , solar cells , biological imaging , and so forth .
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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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