scholarly journals A simple method to improve the performance of perovskite light-emitting diodes via layer-by-layer spin-coating CsPbBr3 quantum dots

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27201-27206
Author(s):  
Bobo Li ◽  
Xiaomeng Li ◽  
Xia Li ◽  
Haolin Liu ◽  
Zhaonan Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spin Coating ◽  
Light Emitting Diodes ◽  
Layer By Layer ◽  
Schematic Diagram ◽  
Simple Method ◽  
Light Emitting ◽  
Cspbbr3 Quantum Dots

Schematic diagram of perovskite LEDs and EQE–voltage curves of these devices.

A step by step strategy for solution-processed quantum dots light emitting diodes

2011 ◽  
Vol 1286 ◽  
Author(s):  
Hélène Bourvon ◽  
Stéphanie Le Calvez ◽  
David Vaufrey ◽  
Sylvia Meunier Della Gatta
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Deposition Process ◽  
Production Costs ◽  
Layer By Layer ◽  
Anisotropic Conductivity ◽  
Light Emitting ◽  
Hybrid Devices

ABSTRACTSolution-based printing and coating processes have the potential to dramatically reduce the production costs of Organic Light Emitting Diodes. This is particularly true for Quantum Dots Light Emitting Diode (QDLEDs), the newborn in the field of LEDs, due to quantum dots price prohibiting wastage. Here, we report our latest results on the development of solutionprocessed QDLEDs. We have implemented a layer by layer strategy, from a whole evaporated small molecule based OLED to a hybrid QDLED developed by wet deposition techniques for the first layers and by evaporation for the last ones. Intermediate steps are discussed in this paper.First, we have worked on a poly(3,4-ethylenedioxythiophene poly(styrenesulfonate) (PEDOT:PSS) layer. The PEDOT:PSS formulation for inkjet printing and spin coating were optimised: wettability on an ITO substrate, jettability of the inkjet formulation and baking conditions were studied. Additives as surfactant and ethylene glycol were added to the commercial inkjet grade solution to improve the deposition process. As a consequence to this study, anisotropic conductivity of PEDOT:PSS was observed and is reported here. In particular, ethylene glycol demonstrated a strong ability to increase the parallel conductivity by several orders of magnitude, but not the vertical one.Then, inkjet-printed and spin-coated device performances are compared to complete this first study. Hybrid devices with an efficacy of 12cd/A at 4V were obtained, with 2.17 % of EQE, and a luminance of 4000 cd/m2 at 4V.Finally, we succeeded in the development of our first QDLED based on CdSe core/ CdSZnS shell quantum dots emitting at a wavelength of 600nm. Quantum dots were inkjet printed, in order to waste as little as possible this very expensive material.

Enhancing the Brightness of CsPbBr3 Quantum Dots Electroluminescence Light-Emitting Diodes through the Manipulation of PEDOT:PSS Films

2021 ◽  
Author(s):  
zhen Wang ◽  
Yue Peng ◽  
wei Wei Chen ◽  
sheng Yong Lu ◽  
sheng Xiao Tang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Temperature ◽  
Energy Level ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Light Emitting ◽  
Styrene Sulfonate ◽  
Poly Styrene Sulfonate ◽  
Cspbbr3 Quantum Dots ◽  
Proper Energy

With solution-processability, low-temperature proper energy level and superior stability, Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is one common hole-transport material for the quantum dots light-emitting diodes (QLED) application. However, the conductivity of the...

scholarly journals High-Quality All-Inorganic Perovskite CsPbBr3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3507 ◽  
Author(s):  
Tien ◽  
Chen ◽  
Lee ◽  
Tseng ◽  
Dong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diodes ◽  
Emission Spectra ◽  
Visible Spectral Region ◽  
Quantum Yields ◽  
High Quality ◽  
Halide Anion ◽  
Variable Yield ◽  
Light Emitting ◽  
Cspbbr3 Quantum Dots

High-quality perovskite CsPbBr3 quantum dots (QDs-CsPbBr3) were prepared using the ultrasonic oscillation method, which is simple and provides variable yield according to requirements. The emission spectra over a large portion of the visible spectral region (450–650 nm) of QD-CsPbX3 (X = Cl, Br, and I) have tunable compositions that can be halide exchanged using the halide anion exchange technique and quantum size-effects. A strong peak with high intensity of (200) lattice plane of purified QDs-CsPbBr3 film is obtained, confirming the formation of an orthorhombic perovskite crystal structure of the Pnma space group. The photoluminescence of QDs-CsPbBr3 was characterized using a narrow line-width emission of 20 nm, with high quantum yields of up to 99.2%, and radioactive lifetime increasing to 26 ns. Finally, through the excellent advantages of QDs-CsPbBr3 mentioned above, purified perovskite QDs-CsPbBr3 as an active layer was utilized in perovskite quantum dot light-emitting diodes structure applications. As a result, the perovskite QDs-CsPbBr3 light-emitting diodes (LEDs) exhibits a turn-on voltage of 7 V and a maximum luminance of 5.1 cd/m2.

scholarly journals Crown Ethers Enable Room-Temperature Synthesis of CsPbBr3 Quantum Dots for Light-Emitting Diodes

2018 ◽  
Vol 3 (3) ◽  
pp. 526-531 ◽  
Author(s):  
Sjoerd A. Veldhuis ◽  
Yan Fong Ng ◽  
Riyas Ahmad ◽  
Annalisa Bruno ◽  
Nur Fadilah Jamaludin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Crown Ethers ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Temperature Synthesis ◽  
Light Emitting ◽  
Room Temperature Synthesis ◽  
Cspbbr3 Quantum Dots

Ag-CsPbBr3 quantum dots/PMMA composite film for tunable white light emitting diodes

2021 ◽  
pp. 130691
Author(s):  
Yangyang Shen ◽  
Xiaolian Yan ◽  
Siqi Ni ◽  
Hongji Zhang ◽  
Haitao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Composite Film ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Cspbbr3 Quantum Dots
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