Luminescence properties of borate phosphors in the UV/VUV region

The intermediate role of Gd3+ in energy transfer to produce light under VUV excitation

“…The excitation bands of 1 S 0 -1 P 1 and 1 S 0 -3 P 1 transition of Bi 3+ are all observed in (Y,Gd)BO 3 :Bi 3+ excitation spectrum upon Gd 3+ emission, which further indicates that there is an efficient energy transfer from Bi 3+ to Gd 3+ . Gd 3+ -Eu 3+ energy transfer has been proved to be a very efficient way by many researchers [13][14][15][16][17][18]. Herewith, we can conclude that the energy transfer from Bi 3+ to Eu 3+ in (Y 0.65 Gd 0.35 )BO 3 :Bi 3+ ,Eu 3+ system must be via Gd 3+ exclusively, i.e.…”

“…Therefore, the electrons on 1 P 1 and 3 P 1 states of Bi 3+ can transit to 6 G J , 6 D J , 6 I J , and 6 P J levels of Gd 3+ well through electric multipole interaction or exchange interaction, which results in Bi 3+ transfering its absorption energy to Gd 3+ efficiently and completely. Gd 3+ -Eu 3+ energy transfer is also an efficient way [13][14][15][16][17][18]. Therefore, Bi 3+ can transfer its absorption energy to Eu 3+ through Gd 3+ efficiently.…”

Hydrothermal synthesis and luminescent properties of LnPO4:Tb,Bi (Ln=La,Gd) phosphors under UV/VUV excitation

“…These results coincided with the energy we observed. The intensity of host-related excitation band peaking at 142 nm in the GT was higher than that in the LT, which suggested that the energy transfer from host to Tb 3+ was higher in the former than in the latter for the presence of the Gd 3+ [20]. Similar phenomenon was observed in LnCa 4 O (BO 3 ) 3 :Tb 3+ (Ln ¼ La,Gd), and the samples of GdCa 4 O(BO 3 ) 3 :Tb 3+ show higher host excitation efficiency than LaCa 4 O(BO 3 ) 3 :Tb 3+ [21].…”

VUV–UV Photoluminescence Spectra of Strontium Orthophosphate Doped with Rare Earth Ions

“…(3) Charge transfer band (CTB) from coordination anions to the rare earth ions (21). (4) The absorption of the host lattice (22)(23)(24)(25). (5) The VUV-UV PL and PLE spectra of Sr 3(1Àx) Eu 3x (PO 4 ) 2 (x=0.03) prepared in air are shown in Fig.…”