Details

Autor(en) / Beteiligte

• Xia, Minfang
• Ju, Zhenghua
• Yang, Huan
• Wang, Zhenbin
• Gao, Xiuping
• Pan, Fuxing
• Liu, Weisheng

Titel

Red-emitting enhancement by inducing lower crystal field symmetry of Eu3+ site in CaWO4:Eu3+ phosphor for n-UV w-LEDs

Ist Teil von

• Journal of alloys and compounds, 2018-03, Vol.739, p.439-446

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• A series of enhanced red-emitting phosphors Ca1-x-yMgxSryWO4:zEu3+ (x = 0.00–0.30, y = 0.00–0.12, z = 0.00–0.16) were successfully synthesized via a high temperature solid-state reaction method. The phase structure, photoluminescence properties and thermal stability were investigated detailedly. All as-prepared samples, especially Ca0.65Mg0.20Sr0.05WO4:0.10Eu3+ phosphors exhibit an extremely enhanced red emission peaking at 616 nm originating from 5D0―7F2 transition of Eu3+ under the 392 nm n-UV excitation. Mg2+ and Sr2+ were introduced into CaWO4:0.10Eu3+ to induce crystallographic parameters and crystal symmetry changes of Eu3+ ions in CaWO4 host. Enhanced red emission, broadband excitation spectra (from 200 to 600 nm), strong ultraviolet absorption matched well with n-UV LEDs chips (350–420 nm) and high color purity (the R/O value is up to 7.52) indicate that as-prepared Ca0.65Mg0.20Sr0.05WO4:0.10Eu3+ sample can be a potential candidate red phosphor for n-UV white light-emitting diodes. [Display omitted] •An enhanced red-emitting phosphor Ca0.65Mg0.20Sr0.05WO4:0.10Eu3+ is developed.•Mg2+ and Sr2+ replace Ca2+ sites to reduce the crystal field symmetry of Eu3+.•The phosphor matches well with the n-UV chips and the R/O value is up to 7.52.•The phosphor exhibits an excellent thermal stability.