The Effect of Particle Size on the Optical and Electrical Characteristics of Quantum Dot Light-Emitting Diode using Zinc Oxide Nanoparticles

2019 ◽  
pp. 936
Author(s):  
Da-Young Park ◽  
Dae-gye Moon
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Quantum Dot ◽  
Zinc Oxide Nanoparticles ◽  
Light Emitting Diode ◽  
Oxide Nanoparticles ◽  
Electrical Characteristics ◽  
Light Emitting ◽  
Effect Of Particle Size

The Effect of Particle Size on the Charge Balance Property of Quantum Dot Light-Emitting Devices Using Zinc Oxide Nanoparticles

2021 ◽  
Vol 21 (7) ◽  
pp. 3795-3799
Author(s):  
Mi-Young Ha ◽  
Chang Kyo Kim ◽  
Dae-Gyu Moon
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Quantum Dot ◽  
Zinc Oxide Nanoparticles ◽  
Transport Layer ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Maximum Current

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.

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

2020 ◽  
Vol 20 (7) ◽  
pp. 4454-4457 ◽  
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.

scholarly journals The Influence of Calcination Temperature on the Formation of Zinc Oxide Nanoparticles by Thermal-Treatment

2013 ◽  
Vol 446-447 ◽  
pp. 181-184 ◽  
Author(s):  
Naif Mohammed Al-Hada ◽  
Elias Saion ◽  
A.H. Shaari ◽  
M.A. Kamarudin ◽  
Salahudeen A. Gene
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Thermal Treatment ◽  
Band Gap ◽  
Calcination Temperature ◽  
Zinc Oxide Nanoparticles ◽  
Treatment Method ◽  
Band Gap Energy ◽  
Oxide Nanoparticles ◽  
Gap Energy

Zinc oxide nanoparticles were synthesized by the thermal-treatment method. Polyvinyl pyrrolidone was used as capping agent and Zinc nitrate was used as a precursor. The samples were calcined at 500 and 550°C for removal of the organic compounds. The structural characteristics of the calcined samples were examined by X-ray diffraction and transmission electron microscopy. The results show that the average particle size increases with increase in calcination temperature. The optical properties were characterized at room temperature using a UV–Vis spectrophotometer in the wavelength range between 200–800 nm and the band gap energy was calculated from reflectance spectra using kubalka munk function and the results indicated that the band gap energy decreased from 3.23 eV at 500 oC to 3.21 eV at 600 °C due to an increase of particle size. This simple thermal-treatment method has advantages of the pure nanoparticles formation as no additional chemicals were required, a lack of by-product effluents, and environmentally friendly process.

The role of albumen (egg white) in controlled particle size and electrical conductivity behavior of zinc oxide nanoparticles

Vacuum ◽  
2011 ◽  
Vol 86 (2) ◽  
pp. 140-143 ◽  
Author(s):  
Prakash Thangaraj ◽  
Jayaprakash Rajan ◽  
Sathyaraj Durai ◽  
Sanjay Kumar ◽  
Ayalsomayajula RatnaPhani ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Egg White ◽  
Oxide Nanoparticles ◽  
Electrical Conductivity Behavior ◽  
Conductivity Behavior

Investigations of white light emitting europium doped zinc oxide nanoparticles

2007 ◽  
Vol 41 (1) ◽  
pp. 015301 ◽  
Author(s):  
S S Ashtaputre ◽  
A Nojima ◽  
S K Marathe ◽  
D Matsumura ◽  
T Ohta ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
White Light ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Light Emitting
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