摘要
将有机发光小分子8-羟基喹啉铝(Alq_3)组装进介孔MCM-41中,采用XRD、IR、荧光光谱等测试方法对组装体Alq_3-MCM-41进行表征。XRD表明,Alq_3-MCM-41保持了有序的介孔骨架结构;IR谱图中,在波数1542 cm^(-1)处出现的特征吸收谱带表明组装体中Alq_3在孔道中与羟基成键;荧光光谱表明,组装体中MCM- 41与Alq_3分子间发生了能量转移,从而使Alq_3-MCM-41具有优异的发光性能;荧光强度随组装量的增多而显著增强,这主要是由于在Alq_3-MCM-41中,MCM-41有序孔道的微环境使Alq_3分子分散性提高,减弱了Alq_3分子间的聚集或缔合现象,从而有效地提高了其发光强度。
Small organic luminescent molecule of 8-hydroxyquinoline aluminum （Alq3） as an active optical＇ guest was incorporated into the one-dimension channels of MCM-41. The assemblies were characterized by means of XRD, IR and PL. The results from XRD patterns suggest that the Alq3-MCM-41 also have the typical mesoporous structure, but the channels were partially destroyed by the entrance of Alq3. The appearance of absorption band at 1 542 cm^-1 in IR absorption spectra shows that there is strong binding force between MCM- 41 and Alq3 in the assembly. As a result of the existence of Alq3, both of the Alq3-MCM-41 and the mechanical mixture have a strong absorption of the excitated light, although the form is different. In the former the Alq3 is bonded with the hydroxyl of MCM-41, while in the latter it is physically adsorbed in the surface. Alq3- MCM-41 has excellent luminescent property owing to the energy transfer between the host and the guest, which is mainly due to the mutual effect of the hybrid inorganic-organic material, and the luminescent intensity strengthens significantly as the content of Alq3 increases. So the luminescent efficiency is improved correspondingly. When it is up to 0.60 g, the relative intensity is as strong as that of the Alq3 powder. The micro- environment in the ordered channels of MCM-41 increases the dispersion of Alq3 molecules, decreasing the aggregation among the molecules, and then the luminescence intensity is effectively enhanced. It also can be seen that MCM-41 is a good host for the Alq3 molecule. The assembly synthesized has the advantage of both the inorganic mesoporous material MCM-41 and the organic Alq3, so Alq3-MCM-41 has a good heating, chemical and mechanical stability, it also has a strong luminescent efficiency. Thus the assembly having a steady luminescent property will make a new way for Alq3 in the application in electronic apparatus and establish a firm base for the synthesis of luminescent materials with excellent properties.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2007年第5期788-791,共4页
Chinese Journal of Luminescence
基金
吉林省教育厅科技计划资助项目(2006237)
