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- W3213239245 abstract "• Efficiency enhancement of QD-LED by small molecular hole transporting material. • The QD ordering changes with the addition of HTM. • Excessive HTM induced the ordering of QDs to have hexagonal close-packing. • The QD ordering causes a carrier leakage of imperfect charge injection into QDs. Quantum dot-based light-emitting diodes (QD-LED) have advantages over organic-based light-emitting diodes (OLED) with narrow bandwidth and easy tuning of the wavelength range. A blending of the organic hole transport material (HTM) into the quantum dot (QD) emission layer (EML) can improve the efficiency of the QD-LED at an optimized concentration. However, the relationship between structural morphology and efficiency has not been fully understood. In this work, it is found that the efficiency of green QD-LED is improved when we mixed 10 wt% of 4,4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA), a small molecular HTM, to QD EML. We find that the hole transportability is improved as the mixing ratio of TCTA increases up to ∼10 wt%. Above 10 wt% of TCTA, the electrons flowing from the cathode are relatively blocked to prevent exciton formation. There is no significant ordering change for the QD mixed with 10 wt% of TCTA compared to the QD-only film using the grazing incidence small X-ray scattering technique. With increasing TCTA ratio, TCTA induces QDs aligned in 2D hexagonal close-packing. It turns out that the excess TCTA enhances the ordering of QDs but deteriorates the efficiency of the devices due to a carrier leakage of imperfect charge injection into QDs." @default.
- W3213239245 created "2021-11-22" @default.
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- W3213239245 date "2022-03-01" @default.
- W3213239245 modified "2023-10-12" @default.
- W3213239245 title "Correlation between the structural morphology and device characteristics of quantum dot based emission layer blended with small molecular hole transport material" @default.
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- W3213239245 doi "https://doi.org/10.1016/j.apsusc.2021.151925" @default.
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