【摘要】 利用8-羟基喹啉铝(Alq3)与三乙胺之间路易斯酸碱相互作用的笼效应,以及正硅酸乙酯(TEOS)在三乙胺碱性条件下水解成二氧化硅的原理,经过正硅酸乙酯投料比例调控,成功通过一锅法在Alq3生成的过程中合成了表面由二氧化硅均匀包覆的核壳结构Alq3@SiO2.紫外-可见吸收光谱和荧光发射光谱表明,合成的Alq3@SiO2很好的保持了Alq3的光学性质.更多还原

【Abstract】 From the view point of practical application,one thorny problem in organic light emitting diode(OLED) devices OLED,undoubtedly,improving its photochemical stability via coating it with materials that possess anti-oxygen and is how to protect the inner materials from being eroded by oxygen and moisture,and to undertake sufficient long-term stabil-ity.Alq3 is the earliest and widely used organometallic material as an electron transport layer and light emitting layer in Al2(SO4)3?18H2O(1 mmol) in 5 mL water and a solution of tetraethylorthosilicate(TEOS)(2 mmol) in 5 mL ethanol were added dropwise at the same time,respectively.The mixture was allowed to react at 70 ℃ for about 5 h.Then,a green pre-anti-water characters is one of cost-effective ways.Motivated by this,here,we demonstrate one pot synthesis of Alq3@SiO2 with uniform SiO2 covering.To obtain the optimized core-shell Alq3@SiO2 particle,a mixture of 8-hydroxyquinoline(6 mmol),1 mL Et3N and 2 mL deionized water was dissolved in 120 mL ethanol and then heated to 70 ℃,a solution of cipitate was obtained,and purified by washing with water and ethanol.The scanning electron microscope(SEM) and trans-mission electron microscope(TEM) were employed to characterize the morphology of the as-synthesized Alq3@SiO2 parti-cles,which exhibited better results than previous reported.From the measurement of UV-Vis and PL spectra we can see the Alq3@SiO2 we have produced exhibited similar absorption and emission profile compared to pristine Alq3,which is benefi-cial for future application in OLED because it is almost not change the optical property of Alq3.The prepared principle of Alq3@SiO2 can be assigned to the plausible Cage Effect of Et3N embraced Lewis acid Alq3,and a further Et3N catalytic hy-drolysis of TEOS to produce SiO2 on the surface of formed Alq3.Note that Et3N used in this case is also acted as Alq3 mor-phology protective agent during TEOS hydrolysis.This work provides a facile and large scale preparation of Alq3@SiO2 for future improving the long-term stability of OLED devices.更多还原