Synthesis and photoluminescence properties of a potential red-emitting phosphor Sr2-xNb2O7: xEu3+ for white LEDs

A novel scheelite‐type LiCaGd(WO4)3:Eu3+ red phosphors with prominent thermal stability and high quantum efficiency

“…The absorption peaks at 319, 378, 394, 416, and 465 nm correspond to the transitions from the ground state 7 F 0 to the excited states 5 H 3 , 5 L 7 , 5 L 6 , 5 D 3 , and 5 D 2 , respectively. 19 In addition, we can also find that with Eu 3+ doping concentration increasing, the intensity of the charge transition band decreases, but the intensities of characteristic absorption peaks of Eu 3+ ions increase. To further study the effects of Eu 3+ doping on LCGWO:xEu 3+ phosphors, the energy bandgap of LCGWO:xEu 3+ phosphors was estimated by Tauc equation 20,21 :…”

“…For Eu 3+ ‐doped LCGWO phosphor, there are still several weak absorption peaks in the scope of 310 to 500 nm for the f ‐ f characteristic transitions of Eu 3+ ions. The absorption peaks at 319, 378, 394, 416, and 465 nm correspond to the transitions from the ground state 7 F 0 to the excited states 5 H 3 , 5 L 7 , 5 L 6 , 5 D 3 , and 5 D 2 , respectively 19 . In addition, we can also find that with Eu 3+ doping concentration increasing, the intensity of the charge transition band decreases, but the intensities of characteristic absorption peaks of Eu 3+ ions increase.…”