Long-lasting ultraviolet-A persistent luminescence and photostimulated persistent luminescence in Bi³⁺-doped LiScGeO₄phosphor

Abstract

<p>Persistent phosphors emitting in the ultraviolet (UV) spectral region have attracted great attention in recent years, owing to their promising implications to many advanced applications ranging from photocatalysis to phototherapy....</p>

Preparation of flame‐retardant, hydrophobic, ultraviolet protective, and luminescent transparent wood

“…Photoluminescence‐based safety signs can be prepared by formulation of a photoluminescent pigment in paint and plastic strips to guide the public to evacuate a building to a safe site. [ 6,7 ] Phosphorescent products are distinguished by their long‐persistent photoluminescence due to their high capacity to store photons via excitation by an irradiation tool. Such long‐persistent phosphorescent smart goods have then the ability to continue to emit stored lightening energy for prolonged intervals.…”

Recent advances in Pr3+-activated persistent phosphors

“…Studies on phosphors capable of PersL at the short-wavelength (high-energy) end of the spectrum, UV (200-400 nm) spectral range, especially UVC (200-280 nm, ''solar-blind''), have remained silent until very recently. To our best knowledge, only a few persistent phosphors have been reported emitting in the UV range, including UVA (320-400 nm) PersL activated by Bi 3+ , [114][115][116][117][118][119][120][121][122] Pb 2+ , 9 or Tb 3+ , 123 UVB (280-320 nm) PersL activated by Pr 3+ 124,125 or Gd 3+ 126-129 and UVC PersL activated by Pr 3+ 40,41,129-131 or Bi 3+ 129,132 and dual-band UVC and UVB PersL activated by Pr 3+ . 53,133 Due to the high 4f5d energy state (the first case in Fig.…”

“…This phenomenon was also reported in other persistent phosphors known as ''photostimulated PersL''. 115,150 Although optical information storage from persistent phosphors has been reported now and then, the lack of deep traps is still a bottleneck of such storage technologies. 154 Red/IR/multi-band persistent nanophosphors are ideal optical nanoprobes for excitation-free and autofluorescence-free in vivo biomedical applications, based on their long-lived emission after the removal of external excitation and penetration power in tissues.…”

Persistent phosphors for luminous paints: A review

“…[ 101 ] Zhang et al fabricated Li 5 Zn 8 Ga 5 Ge 9 O 36 :1.5%Cr 3+ ,0.5%Ti 4+ – a multi‐spectral excited NIR PP that gets re‐charged either by red LED or laser diode array and lasers in the NIR region. [ 102 ]…”

“…[100] The selfreduction mechanism of bismuth ion (Bi 3+ ) in Ba a multi-spectral excited NIR PP that gets re-charged either by red LED or laser diode array and lasers in the NIR region. [102] 10 | LIMITATIONS AND LATEST TRENDS…”