Top-Emission Ultraviolet-Light-Emitting Diodes Containing Solution-Processed ZnO Nanocrystals
Top-Emission Ultraviolet-Light-Emitting Diodes Containing Solution-Processed ZnO Nanocrystals
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DOI：
10.1143/apex.4.065005
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发表时间：
2011-06
影响因子：
2.3
通讯作者：
T. Toyama;H. Kawasaki;Kazuki Itatani;H. Okamoto
中科院分区：
文献类型：
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作者：
T. Toyama;H. Kawasaki;Kazuki Itatani;H. Okamoto
制备了用于柔性电子应用的含有纳米颗粒的顶部发射发光二极管（NanoLED）。透射电子显微镜图像显示，嵌入在印刷的发光层中的溶液处理的ZnO纳米晶体（NC）是几乎单分散的，具有约10 nm的晶体尺寸。为了改善ZnO激子的UV电致发光发射并抑制来自NC的表面缺陷的可见光发射，研究了氧化铟锡（ITO）顶部电极的低功率沉积以及在ITO之前MoO3层的沉积。最后，从UV到绿色光的转换通过磷光体被证明，揭示了纳米LED的颜色可调谐性。
Top-emission light-emitting diodes containing nanoparticles (NanoLEDs) were prepared for flexible electronics applications. Transmission electron microscopy images revealed that solution-processed ZnO nanocrystals (NCs) embedded in a printed emission layer were nearly monodisperse with a crystal size of about 10 nm. To improve the UV electroluminescent emission of ZnO excitons and suppress visible emission from surface defects of the NCs, the low-power deposition of indium tin oxide (ITO) top electrodes was examined together with the deposition of a MoO3 layer before ITO. Finally, conversion from UV to green light via a phosphor is demonstrated, revealing the color tunability of the NanoLEDs.