Details

Autor(en) / Beteiligte

• Du, Hongli
• Luan, Fangfei
• Li, Dewei
• Sun, Liyuan
• He, Wenxiang
• Zeng, Qingling
• Guo, Dongcai

Titel

Blue light induced red phosphors Sr2CeO4:Eu3+ through co-doping with M2+ (Mg, Ba, Ca) and spectroscopic properties applied in WLEDs

Ist Teil von

• Materials science & engineering. B, Solid-state materials for advanced technology, 2023-08, Vol.294, p.116489, Article 116489

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• A series of Sr2CeO4:2%Eu3+ doped with different metal ions M2+ (M=Mg, Ba, Ca) were synthesized through hydrothermal method. the related phosphors could emit pure red light under being excited with blue light (467 nm), which could be one good alternative for application in blue-excited WLEDs. [Display omitted] •Sr2CeO4 is one kind excellent blue-white-emitting oxide-based phosphor and its emission is due to the Ce4+–O2- charge transfer under a broad excitation band in the UV range.•A series of Sr2CeO4:xEu3+ (x = 0.15, 1, 2, 5 mol%) (SCO:xEu3+) and co-doped with different divalent metal ions (M2+: Mg, Ca, Ba) phosphors were designed through traditional hydrothermal method.•When the concentration of Eu3+ ion goes up to 2 %, the sample exhibits the emission of Ce-O CTS at weak intensity and the emission of Eu3+ ion at higher intensity.•When co-doping with 2 %M2+, the related samples present only emission of Eu3+ ions under blue light excitation with good color purity. In the present work, A series of Sr2CeO4:xEu3+ (x = 0.15, 1, 2, 5 mol%) (SCO:xEu3+) and co-doped with different divalent metal ions (M2+: Mg, Ca, Ba) phosphors were successfully synthesized through traditional hydrothermal method. All the samples performed pure Sr2CeO4 phase. The absorption spectra show that an overlap between Ce4+–O2- CTS band and Eu3+ ions results in the energy transfer from the matrix to the emitting center. With the concentration of Eu3+ ion increasing, the phosphors exhibit orange red emission, and the highest intensity was achieved when the Eu3+ concentration was 2 mol%. The energy transfer mechanism would be dipole–dipole interaction. Furthermore, when the concentration of Eu3+ ion is at 2 mol%, the samples co-doped with M2+ ion performed intense red emission of Eu3+ ion under 467 nm excitation, which is ascribed to M2+ ions disturbed the anisotropic structure to create defects so that make much more efficient energy transfer from Ce-O band to Eu3+ ions. Moreover, CIE chromaticity showed SCO:2%Eu3+/2%M2+ phosphors performed pure red warm light. The above results suggest that SCO:2%Eu3+/2%M2+ can be of potential as red-emitting phosphor for blue-excitation WLEDs.