Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes.
Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes.
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DOI：
10.1021/nl1021442
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发表时间：
2011-02
期刊：
影响因子：
10.8
通讯作者：
Yu Zhang;C. Xie;Huaipeng Su;Jie Liu;S. Pickering;Yongqiang Wang;William W. Yu;Jingkang Wang
中科院分区：
文献类型：
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作者：
Yu Zhang;C. Xie;Huaipeng Su;Jie Liu;S. Pickering;Yongqiang Wang;William W. Yu;Jingkang Wang
在这篇通讯中，我们报道了溶液处理的白色发光二极管(LED)的设计和制造，该LED在器件有源区包含一层无重金属的胶体量子点(QD)和聚合物。将ZnCuInS/ZnS核/壳量子点的红色发射和聚(N，N‘-双(4-丁基苯基)-N，N’-双(苯基)联苯胺)的蓝绿发射混合在一起，得到了白色的电致发光。由于量子点的宽带发射，与5310K的黑体基准相比，获得了高达92的显色指数。L国际委员会对白光LED输出的色度坐标表现出明显的偏差依赖关系。最后，对白光LED的老化进行了研究，揭示了量子点和聚合物分子的光化学稳定性之间的差异以及由此对LED颜色演变的影响。
We report in this communication the design and fabrication of solution-processed white light-emitting diodes (LEDs) containing a bilayer of heavy metal-free colloidal quantum dots (QDs) and polymer in the device active region. White electroluminescence was obtained in the LEDs by mixing the red emission of ZnCuInS/ZnS core/shell QDs and the blue-green emission of poly(N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine). A high color rendering index of 92 was achieved as compared to a 5310 K blackbody reference by virtue of broadband emission of the QDs. The Commission Internationale de l'Eclairage chromaticity coordinates of the white LED output exhibit a distinctive bias dependence. Finally, aging of the white LEDs was studied, revealing the difference between the photochemical stabilities of the QDs and polymer molecules and the consequent effect on the color evolution of the LEDs.