Design and spectral control of a novel ultraviolet emitting long lasting phosphor for assisting TiO2 photocatalysis: Zn2SiO4:Ga3+, Bi3+

How to induce highly efficient long-lasting phosphorescence in a lamp with a commercial phosphor: a facile method and fundamental mechanisms

“…Although numerous LLP materials have been previously reported, it was only in 1996 that this field of research began to attract much wider interest due to the discovery of the highly bright LLP of SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor by Matsuzawa et al 9 Currently, LLP materials are extensively applied in emergency lighting, safety signage, 10 optical storage media, 11,12 in vivo imaging, 1,13 drug carriers, 14 solar energy, 15 and even photocatalysis. 16,17 At present, the best performances of LLP materials are still exhibited by Eu 2+ -doped alkali-earth aluminate phosphors such as SrAl 2 O 4 :Eu 2+ ,Dy 3+ (green, >30 h) 9 and CaAl 2 O 4 :Eu 2+ ,Nd 3+ (blue, >10 h). 18 During the past decades, a large number of new LLP phosphors have been developed.…”

Observation of blue persistent luminescence in amorphous silica annealed by carbon

“…The PersL of the optimal SiO 2 sample calcinated with carbon (1:2) at 600 °C can be recorded for 3600 s (0.32 mcd/m 2 ), and visibly observed much longer (3 h) by using a dark-adapted eye in darkness. It reveals that a 9 defect pair consisting of a dioxasilirane is associated with the emitter; and the shallow traps (0.71 eV) due to oxygen vacancies created during the calcination with carbon should be mainly responsible for the formation of the PersL. 12…”

“…However, the rare-earth raw materials are expensive, and these PersL materials are generally synthesized by solid state method at high temperature (> 1000 °C). In addition, some PersL materials are doped with some toxic or heavy metal ions such as Ta 3+ , Pb 3+ , Bi 3+ , Cr 3+ , Cd 3+ [9,10]. Therefore, it is desirable to develop new PersL materials with the advantages of being low cost, non-toxic, with easy fabrication and excellent PersL properties.…”

Photoluminescence and afterglow behavior of Tb 3+ activated Li 2 SrSiO 4 phosphor

“…[4][5][6][7]. The present commercial Long lasting phosphors (LLP) are SrAl 2 O 4 :Eu 2+ ,Dy 3+ (green) , CaAl 2 O 4 :Eu 2+ ,Nd 3+ (blue)and Y 2 O 2 S:Eu 3+ , Ti 4+ , Mg 2+ (red) [8,9]. As is known to all, sulfides possess poor chemical stability and aluminates tend to deliquesce easily, it is still necessary to develop novel hosts as candidates for LLP phosphors.…”