Luminescence of Ce3+ ions in alkaline earth borophosphates

Structural defects and luminescence properties of Sm2+ ions doped in BaBPO5 phosphor by X-ray irradiation

“…emission center of Ce II and a strontium vacancy V Sr [25]. The relative intensity of the Ce II emission increases with increasing cerium concentration.…”

“…BaBPO 5 is isostructural with SrBPO 5 . Based on this conclusion, it could be suggested that in BaBPO 5 , in addition to the alkaline earth vacancy V Ba defect, the interstitial oxygen ion O i is also possible, especially for the BaBPO 5 sample doped with RE at a high concentration [25,26]. The charge compensation could be (2Sm Ba • + O i ).…”

Luminescence properties of a new blue-emitting phosphor Ce3+-doped CaLaGa3S7

“…Further, Dorenbos and coworkers [25][26][27] in an extensive review on the position of 5d transitions of lanthanides demonstrated that the influence of the crystal field and covalency of the host lattice on the red shift (D) of 4f5d levels is approximately equal for all other lanthanides in the same host lattice. It is possible to use the position of the 5d levels of Ce 3+ to predict those of all other lanthanides.…”

Composition-induced valence variation of europium and the photoluminescence properties for Eu2+ doped borophosphate luminous glass in air

“…However, a series of Sr-containing crystal phases can be found in the database of joint committee on powder diffraction standards (JCPDS), but none of those is found to be perfectly agreeable with the recorded diffraction peaks, which makes the phase identification of host phase uneasy. Some varieties of crystals, however, can be proposed such as in Sr(PO 3 ) 2 , SrB 4 O 7 , SrB 6 O 10 , Sr 2 B 2 P 2 O 10 and SrBPO 5 , depending on the composition variation of raw materials and the post heat-treatment parameter adjustment [15,16] . Even though it is necessary to clearly identify the crystal phases further, the more important at present is to confirm the formation of the Sr-containing crystals after heat-treatment, so as to provide the lattice for Eu to substitute to give typical band transition emissions of Eu 2+ .…”

“…As to where the Eu ions exist in the multiphase and multi-component system of borophosphate glass ceramics, we propose that the Eu ions in the glass-ceramics can exist in the sites of the glassy phase, the sites inside the nanocrystals and the sites localized at the interface between the crystal particles and the glassy phase [13][14][15][16][17] . With the amount of B 2 O 3 increases, the amount of Sr(PO 3 ) 2 crystal increases, which indicates the increase of Eu 2+ to substitute the more sites of Sr 2+ in the crystalline phase to intensify the blue emission.…”