title: Energy upconversion in lanthanide-doped core/porous-shell nanoparticles.
abstract: Here, we report upconversion nanoparticles with a core/porous-shell structure in which bulk emission and nanoemission are simultaneously observed. The activated porous shell can efficiently tune the bulk emission but has negligible influence on the nanoemission.
authors.affiliation: Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Yunxin
authors.initials: Y
authors.lastname: Liu
authors.forename: Dingsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Lingling
authors.initials: L
authors.lastname: Li
authors.forename: Qing
authors.initials: Q
authors.lastname: Peng
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li