Color tuning of direct white light of lanthanum aluminate with mixed-valence europium.
Color tuning of direct white light of lanthanum aluminate with mixed-valence europium.
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DOI：
10.1021/ic902538a
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发表时间：
2010-05
影响因子：
4.6
通讯作者：
Zhiyong Mao;Da-Jian Wang
中科院分区：
文献类型：
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作者：
Zhiyong Mao;Da-Jian Wang
本文介绍了通过在铝酸铕镧中引入阳离子，并由此调节能量转移，从而产生直接白光发射的方法。关于La（0.99-x）Sr（x）AlO（3-delta）：Eu（0.01）和La（0.994）Al（1-x）O（3-delta）：Eu（0.006）以及Mn（x），Li（0.012），位于515 nm的绿光发射对于白色光的颜色混合起关键作用，并且可以通过经由不同量的掺杂剂调节Eu（2+）和Eu（3+）/Mn（2+）的发光中心之间的能量转移和相关跃迁发射来有效地调谐。通过这种混合价态方法，铝酸镧实现了直接白光发射，显色指数的优化值为86，相关色温为5091 K。
The generation of direct white-light emission of the coexisting valence-varied europium-lanthanum aluminate through substitution of cations into the host and its resultant adjustment of the energy transfer have been presented. With respect to La(0.99-x)Sr(x)AlO(3-delta):Eu(0.01) and La(0.994)Al(1-x)O(3-delta):Eu(0.006), and Mn(x), Li(0.012), the green-light emission positioned at 515 nm plays a key role to color mix for white light and can be efficiently tuned by adjusting the transfer of energy and relevant transition emissions between the luminous centers of Eu(2+) and Eu(3+)/Mn(2+), via varying amounts of dopants. Direct white-light emission with optimized values of 86 for the color rendering index and 5091 K for the correlated color temperature has been achieved for lanthanum aluminate by this mixed-valence means.