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研究了两种新型芴类衍生物9,9_二(2_乙基已基)_2,7_二咔唑_9H_芴(简记为DCZF)和9 ,9_二(2_乙基已基)_2,7_二(2_(4_甲氧基)苯_2,1_乙烯基)芴(简记为BMOSF)在N ,N_二甲基甲酰胺(DMF)中的线性吸收和单光子荧光行为,并用脉冲宽度为38ps,重复 频率为10 Hz的1064 nm Nd:YAG脉冲激光研究了两种化合物的三光子吸收性质.结果表明: 两种新材料的最大线性吸收峰分别位于330和380nm,吸收区域覆盖了270—420 nm波段. 两种化合物的荧光带位于蓝_紫区,中心波长为369和442 nm,都具有较小的斯托克斯位移. 化合物DCZF和BMOSF的三光子吸收系数分别为γDCZF=678×10- 20 cm3/W2和γBMOSF=592×10-20 cm3/W2. 同时, 两种新材料还表现出明显的三光子吸收光限幅效应,当入射光强分别为8和6GW/cm2时,非线性透过率分别达到30%和45%.
关键词:
芴类衍生物
三光子吸收
光限幅
非线性透过率 相似文献
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Thiophene-fluorene derivatives with high three-photon absorption activities and their application to optical power limiting 下载免费PDF全文
The three-photon absorption (3PA) properties of two thiophene-fluorene
derivatives (abbreviated as MOTFTBr and {ATFTBr}) have been determined by using a
Q-switched Nd:YAG laser pumped with 38ps pulses at 1064nm in DMF. The
measured 3PA cross-sections are 152\times 10-78cm6s2 and
139\times 10-78cm6s2, respectively. The optimized
structures were obtained by AM1 calculations and the results indicate that
these two molecules show nonplanar structures, and attaching different
donors has different effects on the molecular structure. The charge density
distributions during the excitation were also systematically studied by
using AM1 method. In addition, an obvious optical power limiting effect
induced by 3PA has been demonstrated for both derivatives. 相似文献
3.
一种新型芴类衍生物的光谱性质研究 总被引:7,自引:0,他引:7
合成了具有大π共轭性的对称型芴类衍生物9,9-二(2-乙基已基)-2,7-二(2-(4-甲氧基)苯-2,1-乙烯基)芴(简写为MO-Flu-MO)。通过元素分析、质谱、紫外-可见光谱和红外光谱对其进行了表征。测试了该染料在乙腈、二氯甲烷、四氢呋喃和正己烷4种不同极性溶剂中的线性吸收光谱和单光子荧光谱。结果发现溶剂效应对吸收光谱和荧光光谱表现出不同程度的影响,对产生这些光谱行为的主要原因进行了讨论。 相似文献
4.
研究了两种新型D-π-D结构的芴类衍生物4-{7-[4-(二甲基胺)苯基]-9,9-二(2-乙基己基)-9H-芴-2-}-N,N-二甲基苯胺[缩写为B(DMAP)F]和4-{2-[7-(4-氨基苯乙烯基)-9,9-二(2-乙基己基)-9H-芴-2-]乙烯基}苯胺(缩写为BASF)在四氢呋喃(THF)和N,N-二甲基甲酰胺(DMF)中的线性吸收和单光子荧光行为,用脉冲宽度为38ps,重复频率为10Hz的1064nmNd;YAG脉冲激光研究了两种化合物的三光子吸收性质,结果表明:受溶剂效应的影响,两种化合物在极性较大的四氢呋喃溶剂中的最大线性吸收峰和荧光发射峰都有所红移;在极性较大溶剂中三光子吸收截面的数值较大,最高达到10^ -76cm^6S^2数量级。两种新材料还表现出明显的三光子吸收光限幅效应,当入射光强为8GW/cm^2时,B(DMAP)F和BASF的非线性透过率分别达到35%和39%。 相似文献
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研究了垂直振动激发下钨颗粒的动态有效质量(ω) 和耗散功率p(ω)随频率ω 的依赖关系. 实验发现, 在给定的振动幅度下, 自由表面样品有效质量的实数部分M1 (ω) 、虚数部分M2 (ω) 以及耗散功率p(ω)随频率的变化曲线均出现一个尖锐的共振峰. 随着在颗粒上表面施加压强的增大, M1 (ω), M2 (ω) 和耗散功率p(ω)曲线的峰值频率向高频移动, 且峰值高度也相应增大. 进一步研究发现, 有效质量实数部分的共振频率fg 随表面压强P的变化满足分段幂律规律, 当P较小时, 幂指数为0.3, 当P较大时, 幂指数减小为1/6. 颗粒系统的品质因子的倒数1/Q随压强P的变化满足指数衰减规律. 相似文献
6.
A novel symmetrical charge transfer fluorene-based compound 2,7-bis (4-methoxystyryl)-9, 9-bis (2-ethylhexyl)-9H-fluorene (abbreviated as BMOSF) was synthesized and its nonlinear absorption was investigated using two different laser systems: a 140-fs, 800-nm Ti:sapphire laser operating at 1-kHz repetition rate and a 38-ps, 1064-nm Nd:YAG pulsed laser operating at 10-Hz repetition rate, respectively. Unique nonlinear absorption properties in this new compound were observed that rise from multiphoton absorption. The nonlinear absorption coefficients were measured to be 6.02×10-3 cm/GW (due to two-photon absorption, exciting wavelength is 800 nm) and 3.6×10-20 cm3/W2 (due to three-photon absorption, exciting wavelength is 1064 nm). This new compound possesses strong fluorescence induced by two-photon absorption and obvious three-photon absorption optical limiting effects. 相似文献
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