| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1494673 | Optical Materials | 2011 | 5 Pages |
Mn-ion doped calcium phosphates namely Ca5(PO4)3(OH) hydroxyapatite (HAP), β-Ca3(PO4)2 (β-TCP) as well as Ca9.5Mn(PO4)7 whitlockite were synthesized and the optical properties of the Mn2+ cations were investigated. Annealing under reducing atmosphere enhances the emission of the divalent manganese species. Electron paramagnetic resonance (EPR) and optical spectroscopies confirm that Mn2+ ions are the active species. Orange and red emissions occur respectively for the Mn:HAP and Mn:TCP. For this latter, long-lasting phosphorescence (LLP) coming from the Mn2+ emission (4T1 → 6A1 transition) is observed at 640 nm but it appears that the traps depths are either two shallow or too deep to lead to an efficient long-lasting emission.
► Red long-lasting phosphorescence (LLP). ► β TCP type Ca9.5Mn(PO4)7 compounds. ► Thermoluminescence study of materials. ► Mn2+ EPR and optical spectroscopies. ► Materials for optical imaging.
