Quantum Dot Light-Emitting Devices with Electroluminescence Tunable over the Entire Visible Spectrum
Quantum Dot Light-Emitting Devices with Electroluminescence Tunable over the Entire Visible Spectrum
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DOI：
10.1021/nl9002969
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发表时间：
2009-07-01
期刊：
影响因子：
10.8
通讯作者：
Bulovic, Vladimir
中科院分区：
文献类型：
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作者：
Anikeeva, Polina O.;Halpert, Jonathan E.;Bulovic, Vladimir
量子点发光器件（QD- led）性能的改进是通过选择有机电荷传输层、在可见光谱的不同部分使用不同的胶体量子点以及利用最近展示的强大的量子点沉积方法来实现的。我们的qd - led的光谱窄电致发光在整个可见波长范围内从λ = 460 nm（蓝色）到650 nm（深红色）进行调谐。通过在相同的OD- led结构中打印不同OD类型的紧密堆积单层，我们证明了在同一衬底上可以制造具有不同化学性质的量子点的不同颜色的qd - led。与之前的报告相比，我们讨论了绿色（4倍）和橙色（30%）qd - led效率提高的机制，并概述了实现高效蓝色qd - led的相关挑战。
Improvements in quantum dot light-emitting device (QD-LED) performance are achieved by the choice of organic charge transporting layers, by use of different colloidal QDs for the different parts of the visible spectrum, and by utilizing a recently demonstrated robust QD deposition method. Spectrally narrow electroluminescence of our QD-LEDs is tuned over the entire visible wavelength range from lambda = 460 nm (blue) to 650 nm (deep red). By printing close-packed monolayers of different OD types inside an identical OD-LED structure, we demonstrate that different color QD-LEDs with QDs of different chemistry can be fabricated on the same substrate. We discuss mechanisms responsible for efficiency increase for green (4-fold) and orange (30%) QD-LEDs as compared to previous reports and outline challenges associated with achieving high-efficiency blue QD-LEDs.