PT Journal AU Hudry, D Busko, D Popescu, R Gerthsen, D Howard, IA Richards, BS TI An enhanced energy migration strategy in upconverting nanocrystals: Color-tuning with high quantum yield SO Journal of materials chemistry / C PY 2019 BP 7371 EP 7377 VL 7 IS 24 DI 10.1039/c9tc01567a LA english ER