Characteristics of Organic NLO Materials in Silica Matrix Prepared by Sol-gel Process

졸-겔공정에 의해 실리카 구조체에 도입된 유기 NLO 물질의 특성

Organic nonlinear optical materials such as MNA(2-Methyl-4-nitro-aniline), Carbazole 1(5-Nitro-9-hydroxyethyl Carbazole), Carbazole 2(5-Nitro-9-ethyl Carbazole) and DR 1(Disperse Red 1) were incorporated into silica matrix to form a composite thin films. The thermal stability and degree of degradation were compared to these organic-inorganic composite film. Among those films, Carbazole 1 and DR 1 which have terminal -OH group showed enhanced stability for thermal degradation. The effect of polarization and degree of relaxation for the composite thin films incorporated with Carbazole 1 were measured by the absorbance change of UV spectra with time. With polarization treatment of Carbazole 1 incorporated composite film, the intensity of UV absorbance was remarkably reduced. And slow relaxation of Carbazole 1 molecule was suggested from the slightly recovered intensity of UV absorbance after removing the electric field at rooma temperature.

반응성과 성형성이 우수한 졸-겔법을 이용하여 비선형 광학물질인MNA(2-Methyl-4-nitro-aniline), Carbazole 1(5-Nitro-9-hydroxyethyl Carbazole), Carbazole 2(5-Nitro-9-ethyl Carbazole) 그리고 DR1(Disperse Red 1)을 Silica matrix에 조합시킨 유-무기계 복합박막을 제조하였다. 이들 유-무기계 복합박막의 열적 안정도와 분해정도를 비교한 결과 -OH기를 갖는 Carbazole 1과 DR 1이 열분해에 대한 안정성이 우수하다는 것을 알았다. Carbazole 1의 편극화 처리로 UV 흡광도의 현저한 감소가 일어났고 상온에서 전기장을 제거하자 UV 흡광도의 느린 회복이 발견되었다.