Luminescence and chromaticity of alkaline earth aluminate M_xSr_1−xAl₂O₄:Eu²⁺ (M: Ca,Ba)

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• 作者：Li-Te Chen ; Chii-Shyang Hwang ; I-Lei Sun and In-Gann Chen
• 关键词：LED illumination ; Alkaline earth aluminate phosphors ; Chromaticity ; Crystal field theory ; PL ; Quantum efficiency
• 刊名：Journal of Luminescence
• 出版年：2006
• 出版时间：May 2006
• 年：2006
• 卷：118
• 期：1
• 页码：12-20
• 全文大小：637 K

文摘

In order to prepare fluorescent material for UV-LED used as illumination light source, two series of Eu²⁺ doped (1 mol % ) alkaline earth aluminate phosphors Ca_xSr_1−xAl₂O₄ and Ba_xSr_1−xAl₂O₄ were prepared. The crystal structure, relative quantum efficiency(Qr), peak wavelength(ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml29&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=ba5b51b7a3b1153555b4540265f77248"" title=""Click to view the MathML source"">λ_p), color tuning and chromaticity were investigated by XRD patterns and photoluminescence (PL) on samples prepared by solid solution system (s series) and powder mixing system (m series) respectively. For the s series, the synthesized Ca_xSr_1−xAl₂O₄:Eu²⁺ powders show that the structure transforms from monoclinic to hexagonal at ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml30&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=d7e396e0a8e5bbeb2beaa9083e8e597a"" title=""Click to view the MathML source"">x0.5, and ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml31&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=d15ae8528fcce69976e8a82c262098e3"" title=""Click to view the MathML source"">λ_p increases from 442.3 to 529.7 nm with decreasing x. For the Ba_xSr_1−xAl₂O₄:Eu²⁺ system, the structure transforms from monoclinic to hexagonal at ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml32&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=b9147f7b6ff0dc848706371aa24346ca"" title=""Click to view the MathML source"">x0.3, and ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml33&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=d4a77053c9c65c28e095462b55182085"" title=""Click to view the MathML source"">λ_p decreases from 520.5 to 502.2 nm continuously from ack"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJH-4GSJRFY-1&_mathId=mml34&_user=10&_cdi=5311&_rdoc=3&_handle=V-WA-A-W-AC-MsSAYVW-UUW-U-AAVCBVDVBY-AAVWEWYWBY-DBCWZYDYE-AC-U&_acct=C000050221&_version=1&_userid=10&md5=74de8adbdceb038bf092da07126d8a7e"" title=""Click to view the MathML source"">x