Enhanced upconversion emission of three dimensionally ordered macroporous films Bi2Ti2O7:Er3+, Yb3+ with silica shell

Photochromic induced dual‐mode luminescence modulation of CaWO4: Yb3+, Ho3+, Bi3+ ceramics for anticounterfeiting agent

“…5,6 There are several methods for luminescence regulation: changing the structure of the core shell, controlling the crystal field by changing the composition, regulating the type of doped rare earth (RE) ions, and regulating the external field luminescence. [7][8][9][10][11] Although the first three can achieve the purpose of controlling luminescence, only the external field regulation is reversible regulation of photoluminescence, such as thermal, electric, magnetic and light fields. Compared with other external fields, external light fields have the advantages of simple operation, strong real-time, high regulation efficiency, and high security.…”

“…With the expansion of application fields and the emergence of new luminescent materials, the regulation of luminescence has gradually become a research hotspot 5,6 . There are several methods for luminescence regulation: changing the structure of the core shell, controlling the crystal field by changing the composition, regulating the type of doped rare earth (RE) ions, and regulating the external field luminescence 7–11 . Although the first three can achieve the purpose of controlling luminescence, only the external field regulation is reversible regulation of photoluminescence, such as thermal, electric, magnetic and light fields.…”

Improvement of luminescence properties of NaYF4:Yb3+/Er3+ upconversion materials by a cross‐relaxation mechanism based on co‐doped Ho3+ ion concentrations

“…Reports on luminescence properties show that high energy phosphor materials comprise oxygen‐based systems. There have been many reports on oxygen‐based UC materials, such as Y 2 O 3, [ 10 ] Bi 2 Ti 2 O 7, [ 11 ] CaTiO 3, [ 12 ] and Y 2 SiO 5, [ 13 ] however oxygen‐based phosphor material systems possess high photon energy in the host molecules due to stretching vibrations. By contrast, fluoride‐based phosphor material systems such as NaYF 4 , offer the advantage of a good host lattice with low photon energy, which results in minimization of quenching of the rare‐earth ion excited state.…”