Fluorescence properties of SrAl12O19 : Pr3+ quantum cutting phosphor
Fluorescence properties of SrAl12O19 : Pr3+ quantum cutting phosphor
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DOI：
10.1088/0022-3727/46/6/065305
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
Y. Ikeda;K. Masada;H. Kurokawa;H. Motomura;M. Jinno;K. Tachibana
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文献类型：
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作者：
Y. Ikeda;K. Masada;H. Kurokawa;H. Motomura;M. Jinno;K. Tachibana
为了提高无汞辉光放电荧光灯（FL）的发光效率，研究了Pr掺杂SrAl_（12）O_（19）（SA：Pr）荧光粉。所获得的样品用作量子切割磷光体，其将在172 nm处的吸收的双光子发射的光子转换成两个可见光子，一个在401.8 nm处，另一个在486.3、526.3、623.7或644.6 nm处。Pr的浓度是最佳的，并且在5mol%的磷光体的可见发射变得最大。光致发光测试结果表明，SA：Pr（Pr：5mol%）的相对量子效率为BaMgAl 10 O 17：Eu 2+（BAM：Eu）的38.4%.镀有SA：Pr（Pr：5mol%）的介质阻挡放电（DBD）荧光灯的亮度达到镀有BAM：Eu的同类灯的28.8%。由Xe-DBD灯激发的SA：Pr（Pr：5摩尔%）的CIE色坐标为x = 0.307和y = 0.292。SA：Pr磷光体具有峰值在468 nm处的对应于1 I6态的激发带和位于250至420 nm的低强度激发带。后者是由于自陷激子（STE）带。该STE带由于在172 nm处的激发中从1 S 0到3 P0的非辐射跃迁而导致能量路径。前一个激发带在468 nm附近与普通蓝光LED的发射相一致。当在该波长下激发磷光体时，在486.3、526.3、623.7和644.6nm处观察到发射光谱。因此，SA：Pr可替代地可用于由蓝光激发的白色LED。
A phosphor, SrAl12O19 doped with Pr (SA : Pr), is investigated in this research in order to improve the luminous efficacy of a mercury-free Xe discharge fluorescent lamp (FL). The obtained sample works as a quantum cutting phosphor which converts an absorbed photon of Xe emission at 172 nm into two visible photons, one at 401.8 nm and the other at 486.3, 526.3, 623.7 or 644.6 nm. The concentration of Pr is optimized and the visible emission of the phosphor becomes maximum at 5 mol%. The photoluminescence measurements show that the relative quantum efficiency of SA : Pr (Pr: 5 mol%) is 38.4% of BaMgAl10O17 : Eu2+ (BAM : Eu). The luminance of a Xe dielectric-barrier-discharge (DBD) FL coated with SA : Pr (Pr: 5 mol%) achieves 28.8% of the same lamp with BAM : Eu. The CIE colour coordinate of the SA : Pr (Pr: 5 mol%) excited by the Xe-DBD lamp is x = 0.307 and y = 0.292. The SA : Pr phosphor has an excitation band peaking at 468 nm corresponding to the 1I6 state and a low intensity excitation band lying from 250 to 420 nm. The latter is attributed to the self-trapped exciton (STE) band. This STE band causes an energy path due to non-radiative transition from 1S0 to 3P0 in the excitation at 172 nm. The former excitation band around 468 nm coincides with an ordinary blue LED's emission. When the phosphor is excited at this wavelength, the emission spectra are observed at 486.3, 526.3, 623.7 and 644.6 nm. Therefore, the SA : Pr may alternatively be useful for white LEDs excited by blue light.