Enhanced red emission from Eu 3+ –Bi 3+ co-doped Ca 2 YSbO 6 phosphors for white light-emitting diode

Highly efficient red-emitting Ca2YSbO6:Eu3+ double perovskite phosphors for warm WLEDs

“…8,9 However, the most widely used rare earth ion activated red phosphors such as Y 2 O 3 :Eu 3+ , Y 2 O 2 S:Eu 3+ and CaAlSiN 3 :Eu 2+ also exhibit several limitations including low efficiency, chemical instability and complicated preparation processes, which prevent their broad application for lighting. [10][11][12] Thus, it is urgent to search for a novel red phosphor with excellent stability, high conversion efficiency and low concentration quenching, which can be synthesized easily.…”

“…15 Recently, ordered double perovskite type oxides with the general formula A 2 BB 0 O 6 (A ¼ Ca, Sr, Ba, Y, La, Gd; B ¼ Y, La, Gd, Mg, Zn, Li; B 0 ¼ Sb, Ta, Nb, Ti) or AA 0 BB 0 O 6 (A ¼ Ca, Sr, Ba, Na, Li; A 0 ¼ Y, La, Gd; B ¼ Mg, Zn; B 0 ¼ W, Mo, Sb, Ta, Nb) have been intensively investigated owing to their good thermal stability and chemical properties. 10,16 In typical crystal structures of double perovskites, both the B and B 0 sites are coordinated with six oxygen atoms by corner-sharing alternately, while the A (or A 0 ) site is coordinated with eight or twelve oxygen atoms based on the distortion of the crystal structure. Besides, the BO 6 and B 0 O 6 sites can reduce the symmetry of the A (or A 0 ) ones and produce various coordination environments for doping with rare earth ions.…”

“…Recently, Bi 3+ and Eu 3+ ion co-doped Ca 2 -YSbO 6 phosphor materials have been synthesized, and the luminescence enhancement mechanism was also investigated. 10 However, the inuences of structure symmetry on high concentration quenching, thermal stability and quantum efficiency of Ca 2 YSbO 6 :Eu 3+ red phosphors have not been studied in detail. Besides, the potential application for WLEDs is also unconsidered.…”

Synthesis of Dy3+, Eu3+ and Tb3+ Activated Y2O2S Optoelectronic Phosphors for N-UV LED Applications

“…In this range we have observed charge transfer band at 255nm and several narrow excitation peaks in the range of 350nm and 400nm are due to the typical f-f transition of Eu 3+ . The strongest excitation peaks observed at 396 nm and 468nm, which are ascribed due to 7 F 0 → 5 L 6 and 7 F 0 → 5 D 2 transitions of Eu 3+ ions, respectively [21]. Besides this, due to the charge transfer band (Eu 3+ →O 2-) broad excitation peak at 255 nm is also observed.…”

Influence of Bi3+content on photoluminescence of InNbO4:Eu3+,Bi3+for white light-emitting diodes

“…The particles have a narrow size distribution and the median diameter is about 2.3 µm, which elucidates why the phosphors are meeting the production requirements of solid lighting facilities [30]. (CT) [31], the other is a narrow peak region above 362 nm which is assigned to the 4f 7 configuration transitions of Eu 3+ from the ground state to the excited state in the host lattice [32]. Among these peaks, the dominant sharp peaks occur at 394 nm ( 7 F 0 → 5 L 6 ) and 466 nm ( 7 F 0 → 5 D 2 ).…”