Blue-light activated green emitting BaY₂Al₂Ga₂SiO₁₂:Ce³⁺,Bi³⁺: efficient persistent luminescence phosphors for AC-LEDs

Abstract

The advent of alternating current light-emitting diodes (AC-LEDs) based on persistent luminescence (PersL) phosphors is a major breakthrough in terms of long service lifetime, reduced production cost, and high energy...

Luminescence–structure relationships in solids doped with Bi3+

“…The perspectives, in this concern, are real, as demonstrated by the increasing desire for Bi 3+ -doped compounds applicable in e.g. lighting, 230-234 persistent luminescence, [235][236][237][238] anti-counterfeiting [239][240][241][242] or optical thermometry. [243][244][245][246][247][248][249]…”

Insights into blue-light activated red-emitting persistent luminescence from Pr3+-doped phosphors

“…The reliability factors for the whole patterns are R p = 4.26%, R wp = 9.01%, and χ 2 = 1.77, demonstrating that the reliability results were reasonable. 18,30,31 And the unit cell parameters are a = b = c = 12.2033 (3) Å, V = 1817.32 (6) Å 3 . Fig.…”

“…To date, persistent phosphors excitable by blue light have received considerable attention for their wide applications in AC-LEDs, multi-cycle bio-imaging, anti-counterfeiting and indicator marks, 4,5,[11][12][13][14][15] for example BaLu 2 Al 2 Ga 2 SiO 12 :Ce 3+ (cyan), 16 SrAl 2 O 4 (green), 17 BaY 2 Al 2 Ga 2 SiO 12 :Ce 3+ ,Bi 3+ (green), 18 Sr 3 SiO 5 :Eu 2+ (yellow) 19 and CaS:Eu 2+ ,Dy 3+ (red). 4 Among the red long-lasting phosphors, europium activated sulfides (e.g., CaS:Eu 2+ ,Tm 3+ ) 5 and oxysulfides (e.g., Y 2 O 2 S: Eu 3+ ,Ti 4+ ,Mg 2+ ) 20 exhibit excellent PersL.…”

The effects of Lu3+, Gd3+ and Ga3+ substitution on the photoluminescence of Y2.95−x−yLuxGdyAlzGa5−zO12:0.05Ce3+ phosphors for high-power white AC-LEDs

“…In order to solve the problem of AC-LEDs under blue light excitation, a series of persistent phosphors excited by blue light have been developed, such as SrSi 2 O 2 N 2 :Eu 2+ ,Mn 2+ , 13 SrAl 2 O 4 :Eu 2+ ,Ce 3+ ,Li + , 12 Mg 3 Y 2 (Ge, Si) 3 O 12 :Ce 3+ , 17 Lu 2 CaMg 2 (Si, Ge) 3 O 12 :Ce 3+ , 23 Gd 3 Al 2 Ga 3 O 12 : Ce 3+ , 14 and BaY 2 Al 2 Ga 2 SiO 12 :Ce 3+ ,Bi 3+ . 24 Among these phosphors, Mg 3 Y 2 (Ge, Si) 3 O 12 :Ce 3+ , Lu 2 CaMg 2 (Si, Ge) 3 O 12 :Ce 3+ and BaY 2 Al 2 Ga 2 SiO 12 :Ce 3+ ,Bi 3+ can reduce the percentage of scintillation up to 71.7%, 64.1% and 52.94%, respectively. However, BaY 2 Al 2 Ga 2 SiO 12 :Ce 3+ ,Bi 3+ , which reduces the flicker percentage the most, was not tested for luminescence efficiency in this work and has a very low operating current.…”