Polarization improvement of CsPbClBr<sub>2</sub> quantum dot film by laser direct writing technology

Ma, Teng; Wei, Yi; Hu, Jinning; Chen, Jun; Shen, Weicheng; Qiu, Xiuhua; Wu, Jianrong; You, Zhifeng; Li, Xiaoming; Zeng, Haibo; Li, Zhenhua

doi:10.1364/ol.417723

Cited by 3 publications

(4 citation statements)

References 39 publications

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“…If the spacing is too wide, the interaction will deteriorate, also leading to a decreased polarization degree. [ 37 ] Therefore, there is an optimal spacing value in the CsPbBr 3 QD line arrays. When the number of CsPbBr 3 QD lines is enough to form a “grating” structure, the anisotropy of the structure increases, thus improving the polarization degree.…”

Section: Resultsmentioning

confidence: 99%

“…The ability to polarization anisotropy of horizontal and vertical lines in fs laser-written perovskite QD line array in glass may open new avenues for optical device fabrication, such as polarized optical anti-counterfeiting and encryption. [37,38] For example, a pattern made up of vertical and horizontal lines in the glass can present a different image under the vertical or horizontal polarization direction, because of the anisotropic PL from vertical or horizontal QD lines under different polarization directions (Figure 3a). Under the 447 nm laser excitation with no polarizers, a whole green "heart" pattern made up of vertical (left) and horizontal (right) line arrays emerges (Figure 3b).…”

Section: D Polarized Optical Anti-counterfeiting and Encryptionmentioning

confidence: 99%

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Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Chen

Huang

Yang

et al. 2023

Advanced Optical Materials

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nanorods) show strong polarized absorption and emission due to the dielectric confinement effect and intrinsic optical anisotropy of their asymmetric shapes. [5][6][7] CsPbBr 3 QD is a cubic crystalline phase with high symmetry at room temperature, resulting in almost no optical anisotropy in the single particle and colloidal solution. [8,9] However, many strategies, such as polymer stretching, electrospinning, nanoimprinting, and photolithography, have been utilized to align semiconductor QDs to generate and improve polarized absorption and emission of semiconductor QDs by implementing orientation arrangement. [10][11][12][13][14][15][16][17] By rotating coating CsPbBr 3 QDs on a silica substrate, the silica substrate induced charge redistribution in CsPbBr 3 QDs, resulting in anisotropic dipole transition distribution and overcoming the population averaging effect to produce polarized emission. [18] Furthermore, It is reported that patterned anti-counterfeiting applications can be achieved by directional recombination of CsPbX 3 (X = Cl, Br, I) nanowires in different directions. [17] Under different polarization excitation, the anti-counterfeiting pattern will present different patterns, because of the PL intensity difference under different polarized angles. Although the above methods can endow CsPbBr 3 QDs with polarization emission The pursuit of high-resolution and advanced anti-forgery technology has stimulated a growing demand for anti-counterfeiting and encryption strategies with real-time response and high security. Polarized patterns taking the advantage of high security, rapid response, simple operation, and great selectivity enable real-time and non-invasive detection by monitoring in different polarization directions. Here, a new strategy to design and fabricate the polarized CsPbBr 3 quantum dot (QD) line arrays by femtosecond (fs) laser writing in a transparent glass matrix is proposed. The obtained line array structures endow isotropic CsPbBr 3 QDs with macroscopic polarized emission with a polarization degree up to 0.189. Through programable design, the authors have created 2D and 3D polarized luminescent patterns made up of vertical and horizontal lines inside the glass for polarization-sensitive optical anti-counterfeiting patterns. The CsPbBr 3 QD line arrays used in anti-counterfeiting can be well maintained in the water environment. The successful demonstration of the laser writing CsPbBr 3 QD polarization structures in glass highlights the versatility of anti-counterfeiting and encryption.

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Section: Resultsmentioning

confidence: 99%

Section: D Polarized Optical Anti-counterfeiting and Encryptionmentioning

confidence: 99%

Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Chen

Huang

Yang

et al. 2023

Advanced Optical Materials

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“…Currently, research in this direction is still in its early stages and further studies are needed to realize the potential of this technology. In this regard, to advance the development of direct photolithography processes, we believe that it is essential to refer to and incorporate various reported studies on laser-based patterning processes, [97][98][99] laser patterning of functional glasses, [100][101][102] 3D printing, [103][104] light field regulation, and laser thermal effect control. The literature used in this chapter will be summarized in Table 2.…”

Section: Light Field Regulation For Quantum Dot-polymer Patterningmentioning

confidence: 99%

Direct Photolithography Patterning of Quantum Dot‐Polymer

Guo,

Chen,

et al. 2023

Adv Funct Materials

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For the new display technology based on quantum dots (QDs), achieving high‐precision red, green, and blue pixel arrays has always been a research focus in the pursuit of high‐quality and vivid image displays. However, problems such as material stability and process environment make it difficult to guarantee the quality of high‐precision patterns. The new optical patterning technology represented by direct photolithography is considered a highly promising method for achieving ultrafine patterns at the submicron level. This process prepares patterned quantum dot‐polymer films through light‐induced chemical changes. This paper reviews the progress of direct photolithography research focused on QD‐polymer materials and presents recent advances in such processes for monochromatic/multicolor light patterning. The article classifies QD‐polymers into three categories by combining QDs with polymers in different ways, including polymer‐coated QDs, polymers as QD ligands, and polymers as photocrosslinkers for QDs. Their synthesis schemes, functional features, and challenges are also presented. In addition, a scheme to remove the photomask during direct lithography using lasers and light field modulation is also proposed. It aims to provide readers and researchers with some generalized research information and improvement ideas. This can further advance the development of direct photolithography for QD‐polymers.

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“…With the rapid development of optical materials, perovskite quantum dots stand out in the field of optical materials, [1–3] and achieve a wide range of applications in laser, [4] photoelectric detectors, [5] solar cells and other fields [6–7] . In addition to the simple preparation method and low cost, this kind of material also has the advantages of adjustable band gap, narrow emission peak and high color purity [8–10] .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Research of Perovskite Quantum Dots Powder Based on RbCl Doped CsPbBr₃

et al. 2021

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Researchers have achieved precise control of the size of quantum dots by using the quantum confinement effect. Rb+ and Cs+ with similar ionic radii have become a new mechanism for researchers to regulate the emission wavelength of quantum dots. However, there are few studies on the performance of codoped quantum dots with ion at present. By adding a saturated solution of RbCl into an organic solution of CsPbBr3, quantum dots doped with Rb+ and Cl− were prepared. The prepared quantum dots realized adjustable emission spectrum (457‐510 nm), stable lattice structure, and good stability under ultraviolet light irradiation. Therefore, double ion doping is a new method to prepare short‐wavelength of quantum dots.

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Polarization improvement of CsPbClBr₂ quantum dot film by laser direct writing technology

Cited by 3 publications

References 39 publications

Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Direct Photolithography Patterning of Quantum Dot‐Polymer

Preparation and Research of Perovskite Quantum Dots Powder Based on RbCl Doped CsPbBr₃

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Polarization improvement of CsPbClBr2 quantum dot film by laser direct writing technology

Cited by 3 publications

References 39 publications

Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Three‐Dimensional Laser Writing Aligned Perovskite Quantum Dots in Glass for Polarization‐Sensitive Anti‐Counterfeiting

Direct Photolithography Patterning of Quantum Dot‐Polymer

Preparation and Research of Perovskite Quantum Dots Powder Based on RbCl Doped CsPbBr3

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Product

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Polarization improvement of CsPbClBr₂ quantum dot film by laser direct writing technology

Preparation and Research of Perovskite Quantum Dots Powder Based on RbCl Doped CsPbBr₃