Red emission generation in Ce3+/Mn2+ co-doping Y3Al5O12 phosphor ceramics for warm white lighting emitting diodes

• Published in: Journal of alloys and compounds Vol. 798; pp. 695 - 699
• Main Authors: Ao, Gang, Tang, Yanru, Yi, Xuezhuan, Tian, Yanna, Chen, Jie, Hao, Deming, Lin, Yandan, Zhou, Shengming
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.08.2019; Elsevier BV
• Subjects: Ceramics; Cerium; CRI; Diodes; Doping; Emission spectra; Energy transfer; Excitation; Forbidden transitions; Gallium nitrides; Lighting; Manganese ions; Organic light emitting diodes; Phosphors; White light; WLED; YAG:Ce3+/Mn2+/Si4; Yttrium-aluminum garnet; CRI; Ceramics; YAG:Ce3+/Mn2+/Si4; WLED
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.05.272

Y3Al5O12:Ce3+/Mn2+/Si4+ phosphor ceramics were fabricated by solid state reaction. Red emission is obtained, which is attributed to the Mn2+:4T1→6A1 spin-forbidden transition under the excitation of 450 nm via the efficient energy transfer from Ce3+ to Mn2+.The green emission (535 nm) originating from Ce3+ and the orange emission (587 nm) from Mn2+ ions were observed. Mn2+ ions are more inclined to occupy Al3+ octahedral sites and the Si4+ ions locate in the Al3+ tetrahedral sites and their co-doping is for charge compensation. The red emission component in Ce3+/Mn2+/Si4+ doping YAG phosphor ceramics is significant for obtaining warm white lighting upon increasing Mn2+ concentration under 450 nm excitation. White light emitting diodes were successfully constructed by combining the fabricated ceramics with the GaN blue chips. •Highlights.•YAG: Ce3+, Mn2+ phosphor ceramics were obtained by the solid-state reaction.•Efficient energy transfer from Ce3+ to Mn2+ is observed.•The emission color can be tuned from green to orange.