Yttrium and lanthanum hydride films with switchable optical properties
Yttrium and lanthanum hydride films with switchable optical properties
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DOI：
10.1016/s0925-8388(96)02891-5
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发表时间：
1997-05-20
影响因子：
6.2
通讯作者：
Notten, PHL
中科院分区：
文献类型：
--
作者：
Griessen, R;Huiberts, JN;Notten, PHL
我们发现，钇，镧和稀土氢化物薄膜在其金属-绝缘体转变附近表现出显着的光学性质：dixyles是金属和光泽，而trixyles是半导体和透明的。发光状态和透明状态之间的转变是可逆的，并且可以简单地通过改变H-2气体压力或电解池中的电压来诱导。如果用薄的钯保护层保护，则没有检测到膜的劣化。在Y和La合金的双折射中也观察到了光开关。几个理论模型导致绝缘和透明的三氢化物状态进行了讨论。
We discovered that yttrium-, lanthanum- and rare earth-hydride films exhibit remarkable optical properties near their metal-insulator transition: the dihydrides are metallic and shiny while the trihydrides are semiconducting and transparent. The transition between the shiny and transparent state is reversible and can simply be induced by changing the H-2 gas pressure or the voltage in an electrolytic cell. No deterioration of the films is detected if they are protected by a thin palladium caplayer. The optical switching is also observed in hydrides of alloys of Y and La. Several theoretical models leading to an insulating and transparent trihydride state are discussed.