High efficiency blue-emitting phosphor: Ce3+-doped Ca5.45Li3.55(SiO4)3O0.45F1.55 for near UV-pumped light-emitting diodes

A novel high thermal stability Ce3+-doped Ca5(SiO4)2F2 blue-emitting phosphor for near UV-excited white light-emitting diodes

“…4, after heating the sample up to 420 K, at which the LEDs usually work, the emission intensity still kept by approximately 86% of that measured at room temperature. The value is found to be 71% for Ca 5 [8,23]. The very small decrease in the emission intensity indicates that Ca 5 (SiO 4 ) 2 F 2 :Ce 3 þ ,Na þ phosphors have very good thermal stability and can be effectively used for white light NUV LEDs.…”

Solid-state reaction preparation and photoluminescence properties of Na2Ba6(Si2O7)(SiO4)2:Eu2+ phosphors

“…Based on the variation of emission intensities, it could be ascribed to the concentration quenching owing to the energy transfer mechanism of Eu 2+ ions in Na 2 Ba 6 (Si 2 O 7 )(SiO 4 ) 2 . In order to investigate the concentration quenching mechanism in the Na 2 Ba 6 (Si 2 O 7 )(SiO 4 ) 2 :xEu 2+ phosphor, the following equation is used to evaluate the interaction type between sensitizers or between sensitizer and activator [22,23]:…”

Synthesis, photoluminescence properties and energy transfer studies of color-adjustable CaSrSiO4:Ce3+,Li+,Mn2+ phosphors

“…As far as we know, the critical distance between the activator and sensitizer is always less than 3−4 Å between the exchange interactions. Thus we can determine the quenching mechanism of Ce 3+ ions primarily from the case of multi-polar interaction [19,20]. ions [21].…”