Tunable multicolor upconversion luminescence and paramagnetic property of the lanthanide doped fluorescent/magnetic bi-function NaYbF4 microtubes.

Highlights: [•] Hexagonal phase prism-like NaYbF4 microtubes were synthesized by a hydrothermal method. [•] Tunable multicolor can be obtained by simply tuning Tm3+ and Ho3+ concentration in NaYbF4 system. [•] Tunable multicolor emissions can be achieved via increasing excitation pumping power. [•] Excellent paramagnetic property of NaYbF4 has been studied for the first time. [Copyright &y& Elsevier]