Color Tuning of Oxide Phosphors

Bluish-White Luminescence in Rare-Earth-Free Vanadate Garnet Phosphors: Structural Characterization of LiCa3MV3O12 (M = Zn and Mg)

“…Inorganic phosphor materials have been applied as a spectrum converter to a wide range of emitting devices, from classic cathode-ray tubes (CRT) and fluorescent lamps to white light emitting diodes (white LEDs). − Recently, rare earth metals have been used in phosphor materials for emitting devices because they have many advantages, such as a high luminescence efficiency and color purity . In particular, Eu and Tb ions have been widely employed for solid-state lighting. ,− Moreover, a pure white light can be easily obtained using these rare earth metal elements as luminescent ions. − In fluorescent lamps and white LEDs, white light has been achieved by using only these elements as the luminescence centers in oxide, nitride, or sulfide lattices. ,− However, rare earth ions have narrow excitation spectra due to the 4f–4f forbidden transitions, resulting in low absorbances . Additionally, these metals are more expensive than transition metals, which limits the dissemination of such materials .…”

Vacuum Referred Binding Energy (VRBE)-Guided Design of Orange Persistent Ca3Si2O7:Eu2+ Phosphors

“…As one of the potential candidates, we focused on the Ca 3 Si 2 O 7 :Eu 2+ orange phosphor discovered by Toda et al The Ca 3 Si 2 O 7 crystal is found in minerals and called as rankinite, in which there are three distorted Ca 2+ sites with strong crystal field splitting for Eu 2+ . − As a result, the Ca 3 Si 2 O 7 :Eu 2+ phosphor shows rare orange luminescence among Eu 2+ -doped oxide phosphors by UV or blue excitation but does not show persistent luminescence due to no appropriate electron traps. Previously, Jin et al reported the orange persistent luminescence in Ca 3 Si 2 O 7 :Eu 2+ codoped with Dy 3+ , Er 3+ , or Tm 3+ in 2014 .…”