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▼ [7p-A414-6] Ce doped Sr4-xLiy(Si,Al)19+x(N,O)29+x, an efficient and thermally stable deep blue-emitting phosphor for white LED application
Keywords:deep blue-emitting phosphor, white LED, Sr-sialon
A new Eu doped Sr4-xLiy(Si,Al)19+x(N,O)29+x phosphor has recently been discovered with the single-particle-diagnosis approach.[1-2] The new phase crystallizes in trigonal structure with space group P3m1 This phosphor can be effectively excited with near-UV light and shows blue to green emission with varying Eu concentration.[3]
In this work, we report the synthesis and photoluminescence properties of Ce doped Sr4-xLiy(Si,Al)19+x(N,O)29+x phosphor. A powder sample with high phase purity has been obtained with a solid-state reaction method. The Ce doped new Sr-sialon phosphor shows deep blue emission (424 – 445 nm) after near-UV light excitation. Compared to Eu doped new Sr-sialon phosphor, the Ce doped one has better thermal stability and higher quantum efficiency. When the temperature is increased from 25 oC to 300 oC, there is still 54% of luminescence left. An internal efficiency up to 64% (by 355 nm excitation) can be achieved for a 5% Ce doped new Sr-sialon phase sample. For high color rendering white LED application, Ce doped new Sr-sialon phase phosphor is therefore promising.
[1] N. Hirosaki, T. Takeda, S. Funahashi, R.-J. Xie, Chem. Mater., 2014, 26, 4280-4288.
[2] S. Funahashi, T. Takeda., N. Hirosaki, R.-J. Xie, the 64th JSAP Spring Meeting, 14a-411-4, Yokohama, 2017.
[3] T. Takeda, C.-Y. Wang, S. Funahashi, R.-J. Xie, N. Hirosaki, the 64th JSAP Spring Meeting, 14a-411-5, Yokohama, 2017.
In this work, we report the synthesis and photoluminescence properties of Ce doped Sr4-xLiy(Si,Al)19+x(N,O)29+x phosphor. A powder sample with high phase purity has been obtained with a solid-state reaction method. The Ce doped new Sr-sialon phosphor shows deep blue emission (424 – 445 nm) after near-UV light excitation. Compared to Eu doped new Sr-sialon phosphor, the Ce doped one has better thermal stability and higher quantum efficiency. When the temperature is increased from 25 oC to 300 oC, there is still 54% of luminescence left. An internal efficiency up to 64% (by 355 nm excitation) can be achieved for a 5% Ce doped new Sr-sialon phase sample. For high color rendering white LED application, Ce doped new Sr-sialon phase phosphor is therefore promising.
[1] N. Hirosaki, T. Takeda, S. Funahashi, R.-J. Xie, Chem. Mater., 2014, 26, 4280-4288.
[2] S. Funahashi, T. Takeda., N. Hirosaki, R.-J. Xie, the 64th JSAP Spring Meeting, 14a-411-4, Yokohama, 2017.
[3] T. Takeda, C.-Y. Wang, S. Funahashi, R.-J. Xie, N. Hirosaki, the 64th JSAP Spring Meeting, 14a-411-5, Yokohama, 2017.