DOI: 10.1039/d6sc05530c ISSN: 2041-6520
Spatial control of Nd 3+ sensitizer in 808 nm excited upconversion nanocrystals towards nearly 100% energy migration efficiency
Ni Zhang, Jin Xu, Shaohua Yu, Xiaoying Shang, Shan Lu, Datao Tu, Zhiyuan Xiao, Yao Lin, Xueyuan ChenA novel sandwich structured core–triple shell NaLuF 4 :Nd,Yb@NaLuF 4 :Yb@NaGdF 4 :Tm@NaLuF 4 :Tb (or Eu) nanocrystal is proposed for acquiring a nearly 100% efficiency of the five-photon upconversion energy migration (Tm 3+ → Gd 3+ → Tb 3+ (or Eu 3+ )).