温度对稀土夹心双萘酞菁LB膜光学性质的影响
Influence of temperature on rare earth sandwich double naphthalocyanines Langmuir-Blodgett multilayer films
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摘要: 采用线性吸收谱和二次谐波产生技术研究了温度对具有中心对称结构的稀土夹心双萘酞菁化合物LB膜光学特性及其LB膜结构的影响。研究发现，加热可以使其LB膜的结构及分子间的相互作用发生变化，并形成J聚集体，从而使得吸收峰发生红移。稀土夹心双萘酞菁化合物约在40 ℃时其二次谐波信号有一个极小值，约在65 ℃时该化合物发生相变，使得二次谐波信号产生极大值，二次谐波信号最小时温度可高达180 ℃，说明该化合物的化学结构较为稳定。
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关键词:
- Langmuir-Blodgett（LB）膜 /
- 稀土夹心双萘酞菁 /
- 二次谐波产生 /
- 温度 /
- 光学性质
Abstract: Using linear absorption spectra and second harmonic generation(SHG) technique, the influence of temperature on optical properties and Langmuir-Blodgett(LB) films structure of rare earth sandwich double naphthalocyanines were investigated.The absorption spectra show that the LB film structure and interaction between the molecules have been changed by heating. The bi-(tetra-tert-butyl-naphthalocyaninato)-orbium molecules formed J-aggregates in LB films, which resulted in absorption spectra red shift. A maximum of the second harmonic generation signal intensity was observed at about 65 ℃ due to a first-order phase transition. The minimum of the second harmonic generation signal intensity was obtained at about 180 ℃, which means that the molecule structure is stable. -
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