2020
DOI: 10.1039/d0ra03846f
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Enhancing the performance of blue quantum-dot light-emitting diodes through the incorporation of polyethylene glycol to passivate ZnO as an electron transport layer

Abstract: Highly efficient blue quantum-dot light-emitting diodes have been realized by blending PEG into ZnO nanoparticles as an electron transport layer due to regulating charge balance and passivating the surface defect states of ZnO nanoparticles.

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Cited by 22 publications
(19 citation statements)
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“…As shown in Figure 5 B, the decreased PL emission intensity in D-ZnO NPs also provides evidence that the defects of ZnO NPs are reduced after introducing DETA ligands. The PL decay of QDs on the ZnO film with and without DETA ligands as well as on the glass substrate were also measured using the excitation wavelength of 375 nm, and the results are shown in Figure 5 C. Compared with the PL decay of QDs on glass substrate, a faster decay behavior is observed for QDs on N-ZnO film, which is due to the quenching effect induced by the defects of ZnO ( Chen et al., 2021 ; Sun et al., 2017 , 2020 ). In comparison, the PL decay of QDs in D-ZnO film is slight slower, and the lifetime is about 11.23 ns, which is higher than that of N-ZnO (8.97 ns).…”
Section: Resultsmentioning
confidence: 99%
“…As shown in Figure 5 B, the decreased PL emission intensity in D-ZnO NPs also provides evidence that the defects of ZnO NPs are reduced after introducing DETA ligands. The PL decay of QDs on the ZnO film with and without DETA ligands as well as on the glass substrate were also measured using the excitation wavelength of 375 nm, and the results are shown in Figure 5 C. Compared with the PL decay of QDs on glass substrate, a faster decay behavior is observed for QDs on N-ZnO film, which is due to the quenching effect induced by the defects of ZnO ( Chen et al., 2021 ; Sun et al., 2017 , 2020 ). In comparison, the PL decay of QDs in D-ZnO film is slight slower, and the lifetime is about 11.23 ns, which is higher than that of N-ZnO (8.97 ns).…”
Section: Resultsmentioning
confidence: 99%
“…The typical QLED structure is indium tin oxide (ITO)/poly- (3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT: PSS)/hole transport layer (HTL)/QD/electron transport layer (ETL)/cathode, 16 where polymers 17,18 and metal oxides 6,7,[19][20][21] have been utilized as HTLs and ETLs by spin-coating, respectively. Among them, poly(N-vinylcarbazole) (PVK), widely used as a HTL of QLEDs due to its deep highest occupied molecular orbit (HOMO) energy level, has a low hole mobility of 2.5 Â 10 À6 cm 2 V À1 s À1 , which is much lower than the electron mobility of metal oxides, such as ZnO (B10 À3 cm 2 V À1 S À1 ).…”
Section: Introductionmentioning
confidence: 99%
“…Among them, poly(N-vinylcarbazole) (PVK), widely used as a HTL of QLEDs due to its deep highest occupied molecular orbit (HOMO) energy level, has a low hole mobility of 2.5 Â 10 À6 cm 2 V À1 s À1 , which is much lower than the electron mobility of metal oxides, such as ZnO (B10 À3 cm 2 V À1 S À1 ). [18][19][20][21] On the other hand, holes are more difficult to inject into the QD emissive layer than electrons because most QDs have a lower valence band than the HOMO energy level of the HTL. 22 As a result, electrons easily accumulate at the interface of the HTL and the QD active layer, thus making the QDs charged and electrons leak into the HTL without recombination, which can greatly deteriorate the device performance of QLEDs.…”
Section: Introductionmentioning
confidence: 99%
“…[15][16][17][18] On the other hand, there are obvious differences among the red, green, and blue quantum dots (QDs), especially the relatively higher conduction band maximum of blue QDs. [19][20][21][22][23][24] This may require different ETLs for different color QLEDs, i.e., the patterning of ETL (different ETL materials for different color pixels) is needed. As known, it is hard to define pixels by spincoating ETL layer.…”
Section: Introductionmentioning
confidence: 99%