Swelling‐Deswelling Microencapsulation‐Enabled Ultrastable Perovskite−Polymer Composites for Photonic Applications

He, Ziqian; He, Jinwei; Zhang, Caicai; Wu, Shin‐Tson; Dong, Yajie

doi:10.1002/tcr.201900074

Cited by 16 publications

(12 citation statements)

References 52 publications

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“…Research groups worldwide are making great efforts to investigate the degradation mechanism of these materials and the possible solutions. [ 213–215 ] Most of the devices described herein were characterized in glove boxes at room temperature. Device performance and stability under realistic and/or harsh testing conditions are rarely investigated or reported.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress on Advanced Optical Structures for Emerging Photovoltaics and Photodetectors

Chen

Tan

Hsu

et al. 2020

Adv Energy and Sustain Res

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Organic‐ and perovskite‐based optoelectronics, which merge excellent optoelectronic properties with potentially large and high‐throughput manufacturing, have attracted attention as emerging revolutionary technologies with considerable practical applications. Herein, the recent progresses in organic‐ and perovskite‐based photovoltaics and photodetectors with integration of judicious optical structure designs are summarized. The characterization and performance metrics of such devices from the perspectives of device architecture, physics, and material science are studied. Research related to devices having dielectric mirrors, diffracted Bragg reflectors/photonic crystals, microcavities, and 2D photonic structures as design elements is discussed. Some suggestions of promising directions for future studies are concluded.

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Section: Discussionmentioning

confidence: 99%

Recent Progress on Advanced Optical Structures for Emerging Photovoltaics and Photodetectors

Chen

Tan

Hsu

et al. 2020

Adv Energy and Sustain Res

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“…In addition, as shown in Figure 11C, a CsPbBr3-polystyrene perovskite-polymer composite film with a center wavelength of 520 nm and a full width at half maximum (FWHM) of 21 nm was prepared by the swelling microencapsulation method. 23 A control measurement based on a glass substrate was also prepared to evaluate the effectiveness of the CLC film, and the blue light leakage rate of display system without CLC film was measured to be 60%. Comparing the normalized emission spectra received by the fiber-optic spectrometer (Ocean Optics HR2000CG-UV-NIR) drawn in Figure 11D from the device structure with and without the CLC film, the CLC film improves the CCE of the color-conversion film by about 43% (under 60% blue light leakage).…”

Section: Proof-of-concept Experimentsmentioning

confidence: 99%

“…The radiation pattern of the LED array was measured by a goniometer (RiGO801 TechnoTeam Vision) and plotted in Figure 11B. In addition, as shown in Figure 11C, a CsPbBr3‐polystyrene perovskite‐polymer composite film with a center wavelength of 520 nm and a full width at half maximum (FWHM) of 21 nm was prepared by the swelling microencapsulation method 23 . A control measurement based on a glass substrate was also prepared to evaluate the effectiveness of the CLC film, and the blue light leakage rate of display system without CLC film was measured to be 60%.…”

Section: Proof‐of‐concept Experimentsmentioning

confidence: 99%

Doubling the optical efficiency of color‐converted micro‐light‐emitting diode displays with a patterned cholesteric liquid crystal polymer film

Hsiang

et al. 2021

J Soc Info Display

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We propose a patterned cholesteric liquid crystal (CLC) polymer film as a selfassembled Bragg reflector to enhance the performance of a color-converted micro-light-emitting diode (LED) display system. In the display system, we firstly optimize the device structure of blue LED chip to maintain a high light extraction efficiency and low optical crosstalk. Next, we fabricate several patterned CLC films with feature sizes ranging from 10 to 80 μm. By integrating the patterned CLC film into a color-conversion micro-LED display, the optical efficiency is doubled while keeping a color gamut of about 90% Rec. 2020.Finally, we carry out a proof-of-concept experiment to validate the functionality of such a patterned CLC film.

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“…A series of theoretically significant polymer materials, such as poly(methyl methacrylate) (PMMA), polycarbonate (PC), polystyrene (PS), polyvinyl chloride (PVC), cellulose acetate (CA), and acrylonitrile butadiene styrene (ABS), were swollen in a dimethylformamide (DMF) environment, infused with PQDs, and finally shrunk to fabricate solidstate substrates using the solvent DMF to illustrate the generality of this strategy [20]. A perovskite-polymer composite was made using ligand-assisted swelling-deswelling microencapsulation to enhance the stability of the perovskite [28]. Extremely luminescent colloidal PQDs made of MAPbX 3 and CsPbX 3 (MA = CH 3 NH 3 + , X = Cl, Br, I) were passivated using polyvinylidene fluoride (PVDF).…”

Section: Introductionmentioning

confidence: 99%

Encapsulated Passivation of Perovskite Quantum Dot (CsPbBr3) Using a Hot-Melt Adhesive (EVA-TPR) for Enhanced Optical Stability and Efficiency

et al. 2021

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The notable photophysical characteristics of perovskite quantum dots (PQDs) (CsPbBr3) are suitable for optoelectronic devices. However, the performance of PQDs is unstable because of their surface defects. One way to address the instability is to passivate PQDs using different organic (polymers, oligomers, and dendrimers) or inorganic (ZnS, PbS) materials. In this study, we performed steady-state spectroscopic investigations to measure the photoluminescence (PL), absorption (A), transmission (T), and reflectance (R) of perovskite quantum dots (CsPbBr3) and ethylene vinyl acetate/terpene phenol (1%) (EVA-TPR (1%), or EVA) copolymer/perovskite composites in thin films with a thickness of 352 ± 5 nm. EVA is highly transparent because of its large band gap; furthermore, it is inexpensive and easy to process. However, the compatibility between PQDs and EVA should be established; therefore, a series of analyses was performed to compute parameters, such as the band gap, the coefficients of absorbance and extinction, the index of refractivity, and the dielectric constant (real and imaginary parts), from the data obtained from the above investigation. Finally, the optical conductivities of the films were studied. All these analyses showed that the EVA/PQDs were more efficient and stable both physically and optically. Hence, EVA/PQDs could become copolymer/perovskite active materials suitable for optoelectronic devices, such as solar cells and perovskite/polymer light-emitting diodes (PPLEDs).

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Swelling‐Deswelling Microencapsulation‐Enabled Ultrastable Perovskite−Polymer Composites for Photonic Applications

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record.

Cited by 16 publications

References 52 publications

Recent Progress on Advanced Optical Structures for Emerging Photovoltaics and Photodetectors

Recent Progress on Advanced Optical Structures for Emerging Photovoltaics and Photodetectors

Doubling the optical efficiency of color‐converted micro‐light‐emitting diode displays with a patterned cholesteric liquid crystal polymer film

Encapsulated Passivation of Perovskite Quantum Dot (CsPbBr3) Using a Hot-Melt Adhesive (EVA-TPR) for Enhanced Optical Stability and Efficiency

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