Enhanced light emission of quantum dot films by scattering of poly(zinc methacrylate) coating CdZnSeS/ZnS quantum dots and high refractive index BaTiO<sub>3</sub> nanoparticles

Zhou, Miao; Tang, Haodong; Sun, Mingyu; Liu, Pai; Liu, Yizun; Chen, Lixuan; Li, Dongze; Wu, Dan; Hao, Junjie; Xu, Bing; Zhao, Zimo; Ren, Zhenwei; Jia, Siqi; Wang, Kai; Sun, Xiao Wei

doi:10.1039/d0ra05389a

Cited by 10 publications

(11 citation statements)

References 26 publications

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“…e high-refractive-index BaTiO 3 nanoparticles were applied in the coating, which improved the scattering coefficient of the QD film to a certain extent. At the same time, they also provided ideas for the development of quantum dot optical films with high scattering and enhanced light for flexible displays [3].…”

Section: Related Workmentioning

confidence: 99%

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Guo¹,

Huang²,

Li³

2022

Advances in Materials Science and Engineering

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The continuous development of nanotechnology has brought new trends of thought and new impetus to sculpture art. In the field of microengraving, people usually use two-photon engraving technology, but not every particle conforms to the engraving process. ZnO nanoparticles have a high refractive index and are extremely flexible, making them the material of choice for laser engraving. This article aims to investigate whether the incorporation of high-refractive-index flexible nanoparticles into engraving techniques can significantly improve the functional properties of products. This paper firstly introduces the preparation methods of common nanoparticle laser engraving materials and then describes simple micro-nano sculptures on this basis. Finally, experiments on the transmittance and refractive index of ZnO nanoparticles are carried out. The experimental results show that the refractive index and transmittance of this material are 1.7 and 1.039, respectively, which is very suitable for laser engraving.

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Section: Related Workmentioning

confidence: 99%

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Guo¹,

Huang²,

Li³

2022

Advances in Materials Science and Engineering

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“…Synthesis of Alloyed Green-Emitting CdZnSeS/ZnS QDs. According to previous studies, 33 the precursors of selenium and sulfur were prepared by dissolving 1.4/7.0 mmol of selenium/sulfur, respectively, in 4.5 mL of TOP under a nitrogen atmosphere. Furthermore, a mixture of 0.4 mmol of CdO, 8.0 mmol of Zn(Ac) 2 , 5.0 mL of oleic acid, and 35.0 mL of ODE was loaded into a 250 mL three-neck flask and heated to 250 °C to obtain a transparent solution under a nitrogen atmosphere.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Alloyed Green-Emitting CdZnSeS/ZnS Quantum Dots with Dense Protective Layers for Stable Lighting and Display Applications

Liu

Hao

Tang

et al. 2021

ACS Appl. Mater. Interfaces

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Alloyed green-emitting CdZnSeS/ZnS quantum dots (QDs) demonstrate potential applications in solid-state lighting and displays owing to their various advantages, such as high color purity, light conversion efficiency, and color rendering index. However, their applications in white light-emitting diodes (WLEDs) are limited by their poor photostabilities on blue-emitting gallium nitride (GaN) LED chips. In this study, the effect of the specific surface area (SSA) in the coating layers on the photostabilities of QDs was investigated. SSA was adjusted by controlling the proportions of dense aluminum oxide (AlO X ) layers and porous silica dioxide (SiO2) layers to fabricate QD protective layers via a catalyst-free sol–gel method. The results showed that the synthesized AlO X possessing the lowest SSA among the synthesis protective layers presented the best QD photostabilities on the LED chips. Moreover, they exhibited a 9.9-fold increase in the operational lifetime (T 80) compared to that of pristine QDs. In addition, the QD-based WLED achieved an excellent display performance with a wide color gamut (115%) of the National Television System Committee (NTSC) color gamut standard. This approach offers a promising strategy for enhancing the QD photostabilities for applications in solid-state lighting and displays by coating the protective layers on the QD surface.

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“…QD-OLEDs have all of the advantages of OLEDs, such as small thickness due to self-emission, high brightness, high contrast ratios, and high refresh rates, as well as those of QDs, with excellent color expression. − Thus, far, most studies in the field of QD CCLs have focused on improving the QD synthesis method to enhance the absorption and emission properties of QDs, formulating QD CCL resins, and fabricating QD CCLs. − In particular, to enhance the color conversion efficiency, research has been conducted to increase QD concentration and improve the thickness of QD CCLs. Another approach to increase the color conversion efficiency is to introduce scattering particles, which are considered essential for QD CCLs. − Scattering particles can improve the extraction of the converted color light by increasing the optical path of blue light, resulting in improved absorption of QDs, and finally, enhancing the emission of QDs. Materials used as scattering particles, such as titanium dioxide (TiO 2 ), silicon dioxide, barium titanium oxide, tin oxide, and zinc oxide (ZnO), should have wide band gaps and should not absorb the OLED and QD light.…”

Section: Introductionmentioning

confidence: 99%

Efficient Quantum Dot Color Conversion Layer with Mixed Spherical/Rod-Shaped Scattering Particles

Park

Hahm

Cho

et al. 2023

ACS Appl. Opt. Mater.

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A quantum dot (QD) color conversion layer (CCL) with mixed-shaped scattering nanoparticles exhibits enhanced light conversion and reduced blue leakage in QD-organic light-emitting diodes (OLEDs). In this study, nontoxic bright red QDs and spherical and rod-shaped zinc oxide (ZnO) nanoparticles were mixed in an ultraviolet-curable resin without aggregation. The mixture of spherical and rod-shaped ZnO nanoparticles enhanced the blue light scattering inside the QD CCL, which results in an increase of the blue absorption by the QDs and a dramatic improvement of the color conversion. Extraction of the converted red light was also attributed to the Mie scattering of the rod-shaped scattering nanoparticles. The QD CCL with 15 wt % mixed-shaped scattering particles showed seven times increase of red intensity and four times decrease of blue intensity compared to that without scattering particles. We fabricated direct coat-type QD-OLEDs and confirmed that the color conversion and output/input efficiencies were improved and the blue leakage was decreased with increasing number of QD CCLs. This method improves the color conversion efficiency without increasing the amount of QDs and reducing the blue leakage without using a color filter.

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Enhanced light emission of quantum dot films by scattering of poly(zinc methacrylate) coating CdZnSeS/ZnS quantum dots and high refractive index BaTiO₃ nanoparticles

Abstract: We report QD films based on a poly(zinc methacrylate) coating with alloyed green-emitting CdZnSeS/ZnS quantum dots (QDs@PZnMA) together with high refractive-index BaTiO3 nanoparticles to enhance the scattering coefficient of the QD films.

Cited by 10 publications

References 26 publications

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Alloyed Green-Emitting CdZnSeS/ZnS Quantum Dots with Dense Protective Layers for Stable Lighting and Display Applications

Efficient Quantum Dot Color Conversion Layer with Mixed Spherical/Rod-Shaped Scattering Particles

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Enhanced light emission of quantum dot films by scattering of poly(zinc methacrylate) coating CdZnSeS/ZnS quantum dots and high refractive index BaTiO3 nanoparticles

Abstract: We report QD films based on a poly(zinc methacrylate) coating with alloyed green-emitting CdZnSeS/ZnS quantum dots (QDs@PZnMA) together with high refractive-index BaTiO3 nanoparticles to enhance the scattering coefficient of the QD films.

Cited by 10 publications

References 26 publications

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Alloyed Green-Emitting CdZnSeS/ZnS Quantum Dots with Dense Protective Layers for Stable Lighting and Display Applications

Efficient Quantum Dot Color Conversion Layer with Mixed Spherical/Rod-Shaped Scattering Particles

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Enhanced light emission of quantum dot films by scattering of poly(zinc methacrylate) coating CdZnSeS/ZnS quantum dots and high refractive index BaTiO₃ nanoparticles