Al-, Ga-, Mg-, or Li-doped zinc oxide nanoparticles as electron transport layers for quantum dot light-emitting diodes

Zinc oxide nanoparticles (ZnO NPs) have been widely used as an inorganic electron transport layer (ETL) in quantum dot light-emitting devices (QLEDs) due to their excellent electrical properties. Here, we report the effect of ZnO NPs inorganic ETL of different particle sizes on the electrical and optical properties of QLEDs. We synthesized ZnO NPs into the size of 3 nm and 8 nm respectively and used them as an inorganic ETL of QLEDs. The particle size and crystal structure of the synthesized ZnO NPs were verified by Transmission electron microscopy (TEM) analysis and X-ray pattern analysis. The device with 8 nm ZnO NPs ETL exhibited higher efficiency than the 3 nm ZnO NPs ETL device in the single hole transport layer (HTL) QLEDs. The maximum current efficiency of 19.0 cd/A was achieved in the device with 8 nm ZnO NPs layer. We obtained the maximum current efficiency of 17.5 cd/A in 3 nm ZnO NPs device by optimizing bilayer HTL and ZnO NPs ETL.

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High Efficiency Quantum Dot Light-Emitting Diode by Solution Printing of Zinc Oxide Nanoparticles

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17591 ◽

2020 ◽

Vol 20 (7) ◽

pp. 4454-4457 ◽

Cited By ~ 3

Author(s):

Da-Young Park ◽

Jae-Hoon Lim ◽

Mi-Young Ha ◽

Dae-Gyu Moon

Keyword(s):

Zinc Oxide ◽

Quantum Dot ◽

Zno Nanoparticles ◽

Zinc Oxide Nanoparticles ◽

Transport Layer ◽

Electron Transport Layer ◽

Oxide Nanoparticles ◽

Average Particle ◽

Charge Balance ◽

Light Emitting

Quantum dot light-emitting diodes (QLEDs) have attracted considerable attention owing to the narrow emission spectra, wide color gamut, high quantum yield and size-controlled emission wavelength. Zinc oxide nanoparticles have been widely used as an electron transport layer (ETL) in QLEDs due to their excellent electrical properties. In this study, we compared the efficiency of QLEDs with organic and zinc oxide ETLs in viewpoint of the charge balance. The QLEDs were constructed using ZnO nanoparticles with an average particle size of 3 nm or 3TPYMB as the ETL materials. CdSe/ZnS quantum dots and poly-TPD were used as a light-emitting elements and hole transporting material, respectively. The QLED with 3TPYMB ETL exhibited current efficiency of 7.71 cd/A, while the efficiency of the QLED using ZnO nanoparticles was significantly improved to 38.76 cd/A. Such a substantial improvement of emission efficiency in the QLEDs with ZnO ETL was attributed to the much better charge balance by the ZnO.

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Improvement of electron injection in inverted bottom-emission blue phosphorescent organic light emitting diodes using zinc oxide nanoparticles

Applied Physics Letters ◽

10.1063/1.3400224 ◽

2010 ◽

Vol 96 (15) ◽

pp. 153306 ◽

Cited By ~ 65

Author(s):

Hyunkoo Lee ◽

Insun Park ◽

Jeonghun Kwak ◽

Do Y. Yoon ◽

Changhee Lee

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Light Emitting Diodes ◽

Electron Injection ◽

Organic Light Emitting Diodes ◽

Oxide Nanoparticles ◽

Light Emitting ◽

Organic Light ◽

Blue Phosphorescent

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Remarkable lifetime improvement of quantum-dot light emitting diodes by incorporating rubidium carbonate in metal-oxide electron transport layers

Journal of Materials Chemistry C ◽

10.1039/c9tc02683e ◽

2019 ◽

Vol 7 (32) ◽

pp. 10082-10091 ◽

Cited By ~ 4

Author(s):

Yujin Lee ◽

Hyo-Min Kim ◽

Jeonggi Kim ◽

Jin Jang

Keyword(s):

Electron Transport ◽

Quantum Dot ◽

Metal Oxide ◽

Light Emitting Diodes ◽

Light Emitting ◽

Remarkable Improvement ◽

Operational Lifetime ◽

Electron Transporting Layer ◽

Doped Zno ◽

Mg Doped

We demonstrated the remarkable improvement of efficiency roll-off and operational lifetime in red quantum dot light emitting diodes (R-QLEDs) by incorporating rubidium carbonate (Rb2CO3) in Mg doped ZnO (MZO) electron transporting layer (ETL).

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Investigation Ink-jet Printed Quantum-dot Light-emitting Diodes Lifetime Properties by IPL Post-treatment of ZnO NPs Electron Transport Layer

Proceedings of the International Display Workshops ◽

10.36463/idw.2020.0419 ◽

2020 ◽

pp. 419

Author(s):

Young Joon Han ◽

Kyung-Tae Kang ◽

Kwan Hyun Cho

Keyword(s):

Electron Transport ◽

Quantum Dot ◽

Light Emitting Diodes ◽

Post Treatment ◽

Transport Layer ◽

Electron Transport Layer ◽

Zno Nps ◽

Light Emitting ◽

Ink Jet

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Improved performance of quantum dot light-emitting diodes by hybrid electron transport layer comprised of ZnO nanoparticles doped organic small molecule

Organic Electronics ◽

10.1016/j.orgel.2019.06.035 ◽

2019 ◽

Vol 74 ◽

pp. 144-151 ◽

Cited By ~ 5

Author(s):

Benchang Liu ◽

Luhua Lan ◽

Yaoyao Liu ◽

Hong Tao ◽

Hongmeng Li ◽

...

Keyword(s):

Electron Transport ◽

Quantum Dot ◽

Small Molecule ◽

Zno Nanoparticles ◽

Light Emitting Diodes ◽

Transport Layer ◽

Electron Transport Layer ◽

Light Emitting ◽

Improved Performance

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Highly-efficient and all-solution-processed red-emitting InP/ZnS-based quantum-dot light-emitting diodes enabled by compositional engineering of electron transport layers

Journal of Materials Chemistry C ◽

10.1039/c9tc01608b ◽

2019 ◽

Vol 7 (25) ◽

pp. 7636-7642 ◽

Cited By ~ 7

Author(s):

Fei Chen ◽

Peiwen Lv ◽

Xu Li ◽

Zhenbo Deng ◽

Feng Teng ◽

...

Keyword(s):

Electron Transport ◽

Quantum Dot ◽

Light Emitting Diodes ◽

Zno Nps ◽

Solution Processed ◽

Light Emitting ◽

Highly Efficient

All-solution-processed red-emitting InP/ZnS-based QD-LEDs with a record ηEQE of 4.24% are successfully fabricated through the compositional engineering of colloidal ZnO NPs, which act as the electron transport layers.

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