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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Single- and two-photon excited fluorescence in organic nonlinear optical single crystal 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole
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Single- and two-photon excited fluorescence in organic nonlinear optical single crystal 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole

机译：有机非线性光学单晶3-（1,1-二氰乙烯基）-1-苯基-4,5-二氢-1H-吡唑中的单光子和双光子激发荧光

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摘要

Fluorescence of nonlinear optical organic single crystal of 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) excited by a nonabsorbed light pulses from Q-switched Nd:YAG laser λ = 1064 nm as well as absorbed λ = 532 nm light is reported. Two mechanisms of two-photon excited fluorescence are considered: (i) direct two-photon excited fluorescence and (ii) single-photon excitation due to reabsorption of light generated in process of second harmonic generation (SHG) by the crystal due to its nonlinear optical properties. Strong anisotropy of fluorescence that has been observed is linked with uniaxial molecular alignment. Fluorescence decay profile shows two- exponential decay with lifetimes of emitting species of 3.7 and 5.6 ns at 293 K. The excitation and fluorescence spectra of the DCNP single crystal have been measured at 294 K and in function of temperature down to 77.4 K. The strong bathochromic shift of fluorescence spectrum in crystal with respect to fluorescence of DCNP molecule in solution is observed and interpreted with possible formation of molecular aggregates.
机译：由Q开关Nd：YAG激光器的非吸收光脉冲激发的3-（1,1-二氰乙烯基）-1-苯基-4,5-二氢-1H-吡唑（DCNP）的非线性光学有机单晶体的荧光据报道有1064 nm以及λ= 532 nm的吸收光。考虑了双光子激发荧光的两种机理：（i）直接双光子激发荧光和（ii）由于二次谐波（SHG）的非线性导致晶体重新吸收在二次谐波生成（SHG）过程中产生的光，因此单光子激发光学性质。已经观察到的强烈的荧光各向异性与单轴分子排列有关。荧光衰减曲线显示了在293 K时具有3.7和5.6 ns发射物种寿命的双指数衰减。在294 K且在温度低至77.4 K的温度下测量了DCNP单晶的激发和荧光光谱。观察到晶体中荧光光谱相对于溶液中DCNP分子荧光的红移，并解释了可能形成的分子聚集体。

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