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利用微乳液方法合成出粒径为4 nm的核-壳结构ZnS∶Tb/CdS纳米晶。用XRD、TEM及荧光光谱等手段对合成的纳米晶的结构、形态和光学特性分别进行了表征。将ZnS∶Tb/CdS纳米晶制作成有机-无机杂化结构电致发光器件,其结构为ITO/poly(3,4-ethylene d ioxythiophene)∶poly(styrene sulfonate)(PEDOT-PSS)(70 nm)/poly(vinylcobarzale)(PVK)(100 nm)/ZnS∶Tb/CdS纳米晶(120 nm)/2,9-d im ethyl-4,7-d iphenyl-1,10-phenanthroline(BCP)(30 nm)/L iF(1.0 nm)/A l(100 nm)。当驱动电压为13 V时,可以测到Tb3+离子的两个特征峰。在电致发光光谱中未测到聚合物PVK的发光,说明电子和空穴是在纳米晶层上复合的。当驱动电压为25 V时,得到器件的最大亮度为19 cd/m2。
The core-shell structure ZnS: Tb / CdS nanocrystals with particle size of 4 nm were synthesized by microemulsion method. The structure, morphology and optical properties of the synthesized nanocrystals were characterized by XRD, TEM and fluorescence spectroscopy. The ZnS: Tb / CdS nanocrystal was fabricated into an organic-inorganic hybrid structure electroluminescent device with the structure of ITO / poly (3,4-ethylene dioxythiophene): poly styrene sulfonate (PEDOT-PSS) ) / poly (vinylcobarzale) (PVK) (100 nm) / ZnS:Tb / CdS nanocrystal (120 nm) / 2,9-d im ethyl-4,7-d iphenyl-1,10-phenanthroline 30 nm) / L iF (1.0 nm) / Al (100 nm). When the driving voltage is 13 V, two characteristic peaks of Tb3 + ions can be detected. No luminescence of the polymer PVK was detected in the electroluminescence spectrum, indicating that electrons and holes were recombined on the nanocrystalline layer. When the drive voltage is 25 V, the maximum brightness of the device is 19 cd / m2.