NAVIGATION
Amino modified upconversion nanoparticles-NH2 (purple blue)
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Amino modified up-conversion nanoparticles-NH2 (yellow-green light)
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Amino-modified up-conversion nanoparticle SiO2-NH2 (near-infrared light)
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Carboxyl modified up-conversion nanoparticles-COOH (near infrared light)
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Carboxyl modified up-conversion nanoparticles-COOH (purple blue)
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Carboxyl modified up-conversion nanoparticles-COOH (yellow-green light)
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