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首页> 外文期刊>Optical Materials >Effect on shifting of phenyl ring in pyrazoline pyrene luminophore and their photophysical and electrochemical investigation
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Effect on shifting of phenyl ring in pyrazoline pyrene luminophore and their photophysical and electrochemical investigation

机译：吡唑啉pyr发光体中苯环移位的影响及其光物理和电化学研究

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摘要

Phenyl substitution in two different positions on pyrazoline ring bearing pyrene luminescent materials were synthesized (PP3M and PP5M) and their structure property relationship investigated. TGA results indicate good thermal stability up to 368 degrees C and 357 degrees C for PP3M and PP5M respectively. DSC and PXRD analysis confirm the existence between amorphous and crystalline nature. The small changes in position of molecular structure brought interesting emission properties in solution state as sky-blue (lambda em = 438 nm) and green (lambda em = 510 nm) color while emission in solid state as sky-blue (lambda em = 537 nm) and yellow (lambda em = 593 nm) color of PP3M and PP5M respectively. The PP3M exhibiting dual emission in solution and solid states are ascribed to twisted intramolecular charge transfer process. The decay of excited state displays shorter and longer values of 1.0 ns and 3.14 ns? The optical band gap decides color emission owing to conjugation length playing major role and their data suggesting semiconducting properties. With increasing polarity of the solvents the dipolemoment changes resulting in intramolecular charge transfer process and this is well understood from the large Stokes shift observed ascribed to solvatochromism. The emission color purities were compared in solution for PP3M and PP5M with standardized color purity values by NTSC. Third order nonlinear optical properties of luminophores were investigated by Z-scan studies refers saturable absorption and self-defocusing nature. Their HOMO-LUMO energy level values were experimentally calculated by electrochemical studies which are in accordance with theoretical values from DFT analysis. Further, DFT geometries reveal twisted molecular geometry of PP3M and PP5M in the ground state.
机译：合成了吡唑啉环含pyr发光材料上两个不同位置的苯取代基（PP3M和PP5M），并研究了它们的结构性质关系。 TGA结果表明，分别对PP3M和PP5M而言，高达368°C和357°C的良好热稳定性。 DSC和PXRD分析证实了非晶和晶体性质之间的存在。分子结构位置的微小变化在溶液状态下产生了有趣的发射特性，如天蓝色（λem = 438 nm）和绿色（λem = 510 nm）色，而固态发射时为天蓝色（λem = 537 nm）分别是PP3M和PP5M的黄色（λem = 593 nm）颜色。在溶液和固态下呈现双重发射的PP3M归因于扭曲的分子内电荷转移过程。激发态的衰减显示出较短和较长的1.0 ns和3.14 ns？由于共轭长度起主要作用，因此光学带隙决定了颜色的发射，其数据表明了半导体的特性。随着溶剂极性的增加，偶极矩发生变化，从而导致分子内电荷转移过程，从溶剂化变色现象观察到的大斯托克斯位移可以很好地理解这一点。通过NTSC将PP3M和PP5M溶液中的发射色纯度与标准色纯度值进行了比较。通过Z扫描研究了发光体的三阶非线性光学性质，即饱和吸收和自散焦性质。它们的HOMO-LUMO能级值是通过电化学研究通过实验计算得出的，符合DFT分析的理论值。此外，DFT几何形状揭示了基态下PP3M和PP5M的扭曲分子几何形状。

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