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标题:Stable and efficient quantum-dot light-emitting diodes based on solution-processed multilayer structures
时间:2020-03-26 12:51:57
DOI:10.1038/nphoton.2011.171
作者:Qian, Lei; Zheng, Ying; Xue, Jiangeng
关键词:scattering;diffusion;propagation
出版源: 《Nature Photonics》 ,5 (9) :543-548
摘要:Multilayer, colloidal quantum-dot based light-emitting diodes that exhibit high brightness, solution processability, colour tunability and narrow emission bandwidth are reported. These devices consist of a quantum-dot emissive layer sandwiched between an organic hole transport layer and an electron transport layer of ZnO nanoparticles, all of which are deposited using a solution process. The devices have maximum luminance and power efficiency values of 4,200 cd m(-2) and 0.17 lm W(-1) for blue emission, 68,000 cd m(-2) and 8.2 lm W(-1) for green, and 31,000 cd m(-2) and 3.8 lm W(-1) for orange-red. Moreover, with the incorporation of the ZnO nanoparticles, these devices exhibit high environmental stability, and the unencapsulated devices have operating lifetimes exceeding 250 h in low vacuum with an initial brightness of 600 cd m(-2).
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目录:
  • Stable and efficient quantum-dot light-emitting diodes based on solution-processed multilayer structures
  • Methods
    • Synthesis of CdSe–ZnS and ZnO nanoparticles
    • Fabrication and characterization of ZnO nanoparticle-based QD-LED
  • Figure 1 Crystallinity and XRD data, schematic of layered device, and energy levels of the ZnO nanoparticle-based QD-LED.
  • Figure 2 Electroluminescence performance of ZnO nanoparticle-based QD-LEDs with blue, green and orange-red emission.
  • Figure 3 Dependence of QD-LED performance on ZnO and QD layer thickness.
  • Figure 4 Electroluminescence spectra and CIE coordinates of the QD-LEDs.
  • Figure 5 Stability data for an unencapsulated green-emitting ZnO nanoparticle-based QD-LED.
  • Table 1 Comparison of turn-on voltage VT, emission peak wavelength λmax, FWHM, maximum luminance Lmax, external quantum efficiency ηEQE, power efficiency ηP and luminous efficiency ηA of the three ZnO nanoparticle-based QD-LEDs.
  • References
  • Acknowledgements
  • Author contributions
  • Additional information

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