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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Investigation on the coloring and bleaching processes of WO(3-x)photochromic thin films
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Investigation on the coloring and bleaching processes of WO(3-x)photochromic thin films

机译：WO（3-X）光致变色薄膜着色和漂白过程的研究

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摘要

WO3-x(oxygen deficient tungsten oxide) thin films and WO3-x/Ta2O5(tantalum oxide) composite films exhibit a huge photochromic effect with 60% near-infrared transmission modulation, in comparison to results in the literature. The colouring efficiency of such films results from both the stoichiometry of the particles (oxygen/tungsten deficient ratio) and the quality of the films (films are thin, homogeneous, and constituted of nanoparticles of about 5 nm in diameter and so with low scattering). Additionally, the high colouring efficiency obtained with a low fluence ultraviolet (UV) lamp is followed by a nearly complete bleaching phenomenon after a few hours in the dark. Beyond the attractiveness of our films toward multiple applications, and especially as films able to regulate the solar flow through smart windows, the optical properties and the colouring and bleaching kinetics were deeply investigated. For both the WO(3-x)thin films and the WO3-x/Ta(2)O(5)composite films, colouring under irradiation and bleaching in the dark are phenomena that both proceed with a complex kinetics combining ultra-fast processes (from charge transfer, with a characteristic time of about one minute) and slower processes (linked to ionic diffusion, with a characteristic time of about one hour or even longer).
机译：与文献相比，WO3-X（氧化氧化钨）薄膜和WO3-X / TA2O5（氧化钽）复合膜具有60％的近红外传输调制具有巨大的光致变色效果。这种薄膜的着色效率由颗粒的化学计量（氧气/钨比率）和薄膜的质量（薄膜薄，均匀，直径约5nm的纳米颗粒构成，并且具有低散射） 。另外，用低流量紫外线（UV）灯获得的高着色效率随后在黑暗中几个小时后几乎完全漂白现象。超出了我们电影对多种应用的吸引力，特别是作为能够通过智能窗口调节太阳能的电影，深层研究了光学性质和着色和漂白动力学。对于WO（3-X）薄膜和WO3-X / TA（2）O（5）复合薄膜，在辐照下着色并在黑暗中漂白是在组合超快速过程的复杂动力学中进行的现象（从电荷转移，具有约1分钟的特征时间）和较慢的方法（与离子扩散连接，具有约1小时或甚至更长的特征时间。

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