Enhanced luminescence of gadolinium niobates by Bi3+ doping for field emission displays

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.…”

Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

“…4 (a), when Eu 3+ and Bi 3+ are incorporated into the NaZr 2 (PO 4 ) 3 lattices, the width of the peak at the CT bands of (O 2− -Eu 3+ ) centered at 250 nm in the excitation spectrum widens and the intensity of the excitation peak is higher compared with that without Bi 3+ . At the same time, another peak appears around 320 nm, which could be assigned to the (O 2− -Bi 3+ ) charge transfer band [6]. and Eu 3+ because of the overlap of excitation spectra [23].…”

“…To enhance luminescence intensity, Bi 3+ ions are usually selected * presented at the 3rd International Workshop on Advanced Spectroscopy and Optical Materials, July 17-22, 2011, Gdańsk, Poland † E-mail: zhouliyatf@163.com as sensitizers, because of their efficiency in absorbing the UV-light and transferring energy to the luminescent center, thereby strengthening the emission intensity of the luminescent center [4][5][6]. As a NZP structure compound, zirconium phosphates MZr 2 (PO 4 ) 3 (M = Na, K) have a rhombohedra structure.…”

Photoluminescence and energy transfer of YAG: Ce3+, Gd3+, Bi3+

“…Based on the survey in the literatures, Bi 3þ ion can be used as a sensitizer to improve the emission intensity of some materials. 16,17 Actually, some previous work reported about the luminescent properties that Bi 3þ ion was co-doping with other RE 3þ ion activators, and energy transfer between Bi 3þ and RE 3þ ions occurred, like 20 and CaSrS: Bi 3þ , Tm 3þ . 21 It is clear from these literatures that the Bi 3þ ion can strongly absorb excitation energy, then transfer efficiently to lower excited states of RE 3þ ions.…”