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Interest in narrow bandgap nanocrystals in particular has intensified in recent years , and the results of research worldwide point to the realistic prospects of applications for these materials in solar cells , infrared optoelectronics ( e . g . lasers , optical modulators , photodetectors and photoimaging devices ) , low cost / large format microelectronics , and in biological imaging and biosensor systems to name only some technologies .
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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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