On the impurity trapped exciton luminescence in La2Zr2O7:Bi3+

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

“…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.…”

“…1 S 0 transitions of Bi 3+ ions while the yellow emission is due to Bi-related trapped excitons that results from a thermal assisted photoionization of the Bi 3+ centre. This later can also be perceived as an emission arising from a metal to metal charge transfer transition between Bi 3+ and Zr 4+ ions [29]. According to [29], the excitation band for the yellow emission is located at about 245 nm, i.e.…”

“…This later can also be perceived as an emission arising from a metal to metal charge transfer transition between Bi 3+ and Zr 4+ ions [29]. According to [29], the excitation band for the yellow emission is located at about 245 nm, i.e. well above the 290 nm band that is assigned to 1 S 0 ?…”

A new blue-emitting phosphor, SrZnO2:Pb2+, synthesized by the adipic acid templated sol–gel route

“…Based on this, the blue-centered emission is an impurity-centered exciton state that is populated by an electron transfer from the 3 P 0,1 excited states of the Pb 2+ ion to the SrZnO 2 conduction band. The emission due to the ionization mechanism is not only valid for Pb 2+ ion, but has also been observed in luminescence of ions such as Yb 2+ [24], Eu 2+ [27], Cu + [28], and Bi 3+ [29]. The impurity-trapped exciton structure consists of the hole localized on the luminescent ion and the electron delocalized over the surrounding cations; for instance, a Yb 3+ core with the electron delocalized over the 12 nearest neighbors Sr 2+ ion forms the trapped exciton in SrF 2 :Yb 2+ [24].…”

Photoluminescence properties of Y2O3co-doped with Eu and Bi compounds as red-emitting phosphor for white LED

“…Conventional Y 2 O 3 : Eu was not absorbed near UV efficiently. Y 2 O 3 : Bi exhibited absorption band at 375 nm and emission band around 410 nm because of 1 S 0 → 3 P 1 transition of Bi 3+[5][6][7][8][9]. When incorporated in Y 2 O 3 : Eu phosphors, Bi 3+ ions act as a sensitizer for Eu 3+ ions under 350 nm radiation.…”