Du, Shuoren Design and validation of a new ratiometric intracellular pH imaging probe using lanthanide-doped upconverting nanoparticles. [electronic resource] - Dalton transactions (Cambridge, England : 2003) Oct 2017 - 13957-13965 p. digital Publication Type: Journal Article ISSN: 1477-9234 Standard No.: 10.1039/c7dt02418e doi