摘要
We report on a white hybrid light-emitting device employing a mixture of ternary CdSe/ZnS quantum dots(QDs)as an emitting layer(EML)and a small molecular material tris(8-hydroxyquinoline)aluminum(Alq3)as an electron-transporting layer.The film morphology of the spin-coated mixture of QDs is strongly improved via thermal annealing,and therefore a close-packed QD-EML is realized between organic charge-transporting layers.As a result,compared to the device with an unannealed QD-EML,the emission of Alq3 is deeply suppressed.In addition,a maximum luminance of more than 1000 cd/m2 and a maximum luminous efficiency of 2.2 cd/A are achieved.
基金
Supported by the National Basic Research Program of China under Grant No 2010CB327701
the National Natural Science Foundation of China under Grant Nos 60977024 and 60907021.
