以溶膠凝膠法製備含二維發色團之非線性光學材料及其電光特性研究

Electro-optical Research of NLO Material with Reactive 2D Chromophore Prepared by Sol-Gel

陳煜仁(Yu-Ren Chen)

指導教授 ： 薛敬和

國立清華大學/工學院/化學工程學系/碩士(2007年)

https://doi.org/10.6843/NTHU.2007.00652

摘要

本研究以二維發色團9-Hexyl-3,6- di(2’-(6-hydroxyhexyl) sulfonylphenyl)-1’-ethenyl)-9H-carbazole (Cz2PhSO2OH)及一維發色團4-N,N-Bis(2-hydroxyethylene) amine -4’- nitroazobenzene (DR19) 進行反應型溶凝膠反應，比較維度對非線性光學穩定性的影響。並以二維發色團9-Hexyl-3,6-di(2-(6-hexyl) sulfonyl phenyl)-1’-ethenyl) -9H– carbazole (Cz2PhSO26C)與Cz2PhSO2OH比較賓主型及反應型對二維發色團在無機基材中穩定性的影響。實驗結果證實反應型二維發色團溶/凝膠系統於二氧化矽高分子網狀結構的補強下，時間及動態熱穩定性有大幅提升的現象，於100℃下無SHG訊號衰退。並透過固態矽譜得知，在二維反應型溶/凝膠系統中，有效轉移溫度(T0)會隨溫度及時間的增加而提升，然而，二階諧波係數(d33)卻有一最適值；另外，經由極化條件的控制，使二維及一維發色團在相同交聯程度條件下進行反應，結果顯示二維反應型溶/凝膠系統的動態熱穩定性(T0＝110℃)明顯較一維反應型溶/凝膠系統(T0＝80℃)高。而且，此兩系統在各自的有效轉移溫度下觀察其隨時間變化的鬆弛行為，二維系統維持的有效二階諧波係數(65％)較一維系統(30％)的多；再者，二維賓主型溶/凝膠系統在極化過程中會發生昇華現象，這是由於發色團與基材無化學鍵結作用力。

關鍵字

非線性光學 ； 溶膠/凝膠 ； 二氧化矽高分子網狀結構 ； 二維發色團

並列摘要

Two dimensional (2D) chromophore, 9-Hexyl-3,6-di (2’-(6-hydroxy hexyl)sulfonylphenyl)-1’-ethenyl)-9H-carbazole(Cz2PhSO2OH), and one dimensional (1D) chromophore 4-N,N-Bis(2- hydroxy ethylene) amine-4’- nitroazobenzene (DR19) with two reactive site proceeded sol-gel process were studied to compare the effects between dimension of chromophore and nonlinear optical (NLO)stability. Hybrid NLO film with another 2D chromophore,9-Hexyl-3,6-di(2’-(6-hexyl)sulfonylphenyl)-1’-ethenyl) -9H– carbazole (Cz2PhSO26C) ,was studied to compare the influence between physical and chemical bonding. The results show that due to the reinforcement of SiO2 polymeric structure , hybrid NLO films with covalent-bonded 2D chromophore were highly improved in temporal and thermal dynamic stability. There is no decay in second harmonic coefficient (d33) at 100℃ for 200 hr. Effective transition temperature (T0) was raised with the enhancement of temperature and time by means of increasing degree of cross-linking , though d33 owns an optimal value. Moreover, by controlling the poling condition, the degree of cross-linking of SiO2 matrix with 2D and 1D chromophore is identical. As for thermal dynamic stability, NLO films with 2D chromophore (T0 = 110℃) are obviously better than with 1D chromophore (T0 = 80℃). As for temporal stability, effective second order harmonic coefficient (deff) of NLO film with 2D chromophore (65%) is better than with 1D chromophore (30%) under individual effective transition Temperature. For hybrid NLO film, the 2D chromophore would be sublimed during poling process since no chemical bondings between chromophore and matrix.

參考文獻

陳鴻仁�光連雙月刊，第38 期�2002

C.Zhang, C. Wang, J. Yang, L. R.Dalton,Macromolecules,2001,34,235

(a)D. H. Choi, J. H. Park,T. H. Rhee, N. Kim, S.D. Lee, Chem. Mater. 1998, 10, 705 (b)W. J. Kuo1, M.C. Chang, T.Y. Juang, C.P. Chen,C.T. Chen, H. L. Chang , R. J. Jeng,Polym. Adv. Technol. 2005; 16: 515 (c)Y .C., G. Qian, L. Chen, Z. Wang, J. Gao, M. Wang,J. Phys. Chem. B, 2006, 110, 4105 (d)L. Chen, G. Qian,Y. Cui, X. Jin, Z. Wang, M. Wang,, J. Phys. Chem. B 2006, 110, 19176

R. S. Finn, J. F. Ward, J. Chem. Phys. 1974, 60, 454.

P. D. Southgate, Appl. Phys. Lett. 1976, 28, 250.