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Filtration Shell Mediated Power Density Independent Orthogonal Excitations–Emissions Upconversion Luminescence
Author(s) -
Li Xiaomin,
Guo Zhenzhen,
Zhao Tiancong,
Lu Yang,
Zhou Lei,
Zhao Dongyuan,
Zhang Fan
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201510609
Subject(s) - nanoparticle , photon upconversion , excitation , luminescence , lanthanide , ultraviolet , doping , filtration (mathematics) , density functional theory , core (optical fiber) , power density , absorption (acoustics) , materials science , photochemistry , chemistry , analytical chemistry (journal) , nanotechnology , optoelectronics , power (physics) , ion , computational chemistry , organic chemistry , composite material , statistics , mathematics , engineering , quantum mechanics , physics , electrical engineering
Lanthanide doped core–multishell structured NaGdF 4 :Yb,Er@NaYF 4 :Yb@NaGdF 4 :Yb,Nd@NaYF 4 @NaGdF 4 :Yb,Tm@NaYF 4 nanoparticles with power‐density independent orthogonal excitations‐emissions upconversion luminescence (UCL) were fabricated for the first time. The optical properties of these core–multishell structured nanoparticles were related to the absorption filtration effect of the NaGdF 4 :Yb,Tm layer. By tuning the thickness of the filtration layer, the nanoparticles can exhibit unique two independent groups of UCL: Tm 3+ prominent UV/blue (UV=ultraviolet) UCL under the excitation at 980 nm and Er 3+ prominent green/red UCL under the excitation at 796 nm. The filtration‐shell mediated orthogonal excitations‐emissions UCL are power‐density independent. As a proof of concept, the core–multishell nanoparticles are used in multi‐dimensional security design and imaging‐guided combined photodynamic therapy and chemotherapy.