Jang, Ho Seong Woo, Kyoungja Lim, Kipil 2024-01-20T14:30:56Z 2024-01-20T14:30:56Z 2021-09-05 2012-07-16 1094-4087 https://pubs.kist.re.kr/handle/201004/129061 Bright dual-mode green-emitting core/shell nanoparticles (NPs) were synthesized by doping selective set of lanthanide ions. Up-conversion (UC) green-emitting beta-NaY0.2Gd0.6F4:Yb-0.18,Er-0.02 NPs (8.3 nm) were used as core material. Bright down-conversion (DC) green-emitting beta-NaGd0.8F4:Ce-0.15,Tb-0.05 NPs showed ca. 31 times higher photoluminescence (PL) intensity than beta-NaGdF4:Tb NPs and they were served as shell material with their excellent PL properties. The UC/DC core/shell NPs showed bright green light under excitations of 980 nm near infrared (NIR) light and 254 nm ultraviolet (UV) light, respectively. The UC/DC core/shell NPs showed ca. 11 times higher UC PL intensity than core UCNPs. Consequently, the core/shell NPs doped with selective set of lanthanide ions showed bright dual-mode green emission under excitations of NIR light and UV light, indicating that they are promising for application to optical imaging. (C) 2012 Optical Society of America English OPTICAL SOC AMER UP-CONVERSION LUMINESCENCE PHOSPHOR PHASE Bright dual-mode green emission from selective set of dopant ions in beta-Na(Y,Gd)F-4:Yb,Er/beta-NaGdF4:Ce,Tb core/shell nanocrystals Article 10.1364/OE.20.017107 1 OPTICS EXPRESS, v.20, no.15, pp.17107 - 17118 OPTICS EXPRESS 20 15 17107 17118 scie scopus 000307055800095 2-s2.0-84864153611 Optics Optics Article UP-CONVERSION LUMINESCENCE PHOSPHOR PHASE upconversion luminescence core/shell nanocrystals downconversion