Investigation of the structure and photoluminescence properties of Eu3+ ion-activated Y6WxMo(1 −x)O12

Color-conversion and photoluminescence properties of Ba2MgW(Mo)O6:Eu phosphor

“…4): in stage 1, when the Mo-content decreasing from 1.0 to 0.4, the emission increases gradually; in stage 2, when x decreases further from 0.4 to 0.2, the emission decreases simultaneously. This phenomenon was similarly observed in the Ba 2 CaW (1−x) Mo x O 6 :Eu and Y 6 W (1−x) Mo x O 12 :Eu systems [41,43]. According to Ye et al [41], and Wiegel and Blasse [45], there are at least two competitive processes undergoing after the MoO 6 groups are excited.…”

“…The proposed phosphors can be basically divided into two groups according to the excitation channels. For one group, the Eu 3+ ion is excited directly through the f-f transition [34][35][36][37][38]; for the other group, sensitizers are introduced to absorb the excitation light and sensitize the doped Eu 3+ ion [39][40][41][42][43][44]. Since the Eu 3+ ion f-f transition is spin and parity forbidden, exciting into a sensitizer other than Eu 3+ ion might be a promise way to increase the energy absorption efficiency.…”

Considerable photoluminescence enhancement of LiEu(MoO4)2 red phosphors via Bi and/or Si doping for white LEDs

“…[9] Scheelite-type crystalline structures, such as LiEu(MoO 4 ) 2 , have recently attracted great attention because of their potential applications in the electro-optical field. [ [11][12][13][14][15][16][17][18][19][20] Although the phosphors used in these white LEDs are currently being developed, the red phosphor still suffers from problems of low brightness, low efficiency, and chemical instability. [21] Therefore, if we want to replace the traditional low efficient phosphors designed for lamps, we need to explore novel red phosphors having enhanced chromaticity coordinate, emission efficiency, and thermal stability.…”

Photoluminescence characteristics of high thermal stable fluorosilicate apatite Ba2Y3(SiO4)3F:Sm3+ orange-red emitting phosphor

“…However, the commercially applicable red phosphor of Y 2 O 2 S:Eu 3 þ is inefficient under near-UV light excitation within the wavelength region of 370 nm-410 nm, and its decomposition products are harmful to the environment. Therefore, new red-or orange-redemitting phosphors doped with Eu 3 þ ion or/and Sm 3 þ have been developed, including Eu 3 þ -doped molybdate and tungstate scheelites [7,8], Eu 3 þ -doped vanadate garnet [9,10], Na 3 YSi 2 O 7 :Sm 3 þ [11], Y 2 Si 4 N 6 C:Sm 3 þ [12], Ca 19 Mg 2 (PO 4 ) 14 :Sm 3 þ [13], LaMgAl 11 O 19 :Sm 3 þ , Eu 3 þ [14], and Ba 2 Ln(BO 3 ) 2 Cl:Sm 3 þ , Eu 3 þ [15]. Compared with Eu 3 þ , Sm 3 þ is an essential activator for many different inorganic lattices to produce orange-red emission because of its 4 G 5/2 -6 H J (J¼ 5/2, 7/2, 9/2, and 11/2) transitions.…”