High Concentration of Bi3+ Incorporated into RNbO4:Eu3+ (R = La, Y, Gd) as Red Phosphors for White LED Applications

Predicting metal-to-metal charge transfer in closed-shell transition metal oxides doped with Bi3+ or Pb2+

“…The observed signals are ascribed to Bi 3+ (6s 2 )?M n+ (d 0 ) MMCT (M n+ = Nb 5+ and Mo 6+ , respectively). Similar attributions of low-lying excitation signals to Bi-MMCT have been made in previous reports for the vanadates LnVO 4 :Bi 3+ (Ln = Y, Gd, La): [16][17][18][19] and the niobates LnNbO 4 :Bi 3+ (Ln = Y, Gd, La) [20][21][22].…”

“…They are indicated with an asterisk. For Bi 3+ doping, the concerned hosts were CaZrO 3 [28], YVO 4 [18], GdVO 4 [16], LaVO 4 [19], YNbO 4 [21], GdNbO 4 [22], LaNbO 4 [20], La 2 Zr 2 O 7 [29], YTaO 4 [30] and (Gd, Bi)Ta 7 O 19 [12] and for Pb 2+ doping, the hosts were SrTiO 3 [26] and CaMoO 4 [24]. For all (except La 2 Zr 2 O 7 ), the energy position of the lowest-lying excitation bands (or shoulders) was indicated as a full square in the diagrams.…”

A new red phosphor LaNb0.70V0.30O4:Eu3+ for white light-emitting diodes

“…This is due to their potential applications in various fields, such as phosphors, optical waveguides, and frequency doublers [9][10][11]. The phosphors used in the present UV LEDs were excited by about 350-400 nm photons.…”

Preparation and characterization of nanosized (Y,Bi)VO4:Eu3+ and Y(V,P)O4:Eu3+ red phosphors

“…These phosphors exhibit strong emission under UV excitation and also show excellent thermal stability. The Bi 3+ incorporation in the YVO 4 lattice cause the absorption band-edge of YVO 4 to shift to a longer wavelength, which is ascribed to the charge-transfer state involving Bi 3+ and neighboring oxygens in (Y,Bi)VO 4 [16][17][18][19]. It is also well known that Bi 3+ acts as a sensitizer for Eu 3+ red emission in the Bi 3+ -and Eu 3+ -codoped YVO 4 phosphor.…”