Facile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamut

Park, Da Hye; Han, Jaejoon; Kim, Woong; Jang, Ho Seong

doi:10.1016/j.dyepig.2017.10.003

Cited by 91 publications

(59 citation statements)

References 41 publications

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“…This slight loss could be attributed to the reabsorption and multiscattering effect caused by the polymer microsphere and SiO 2 shell, which would lower the light out‐coupling efficiency and the acquired PL‐QY of these hybrid microsphere structures . Actually, it is worth mentioning that the ≈84% PL‐QY of the CsPbBr 3 ‐PQDs/MPMs@SiO 2 microspheres is higher than many other reported values of lead halide PQDs composites, indicating that the currently proposed hydrolysis‐encapsulation strategy can well preserve the good fluorescence performance of pristine PQDs.…”

Section: Resultsmentioning

confidence: 92%

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

Yang

Gao

Qiu

et al. 2019

Advanced Optical Materials

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Cesium‐lead‐halide perovskite quantum dots (PQDs), which have superior optical and electronic properties, are regarded as excellent materials for various optoelectronic devices. However, their unstable nature greatly hinders their practical application. Herein, a simple hydrolysis encapsulation method is developed to embed PQDs into mesoporous polystyrene microspheres (MPMs) followed by a silica shell covering process, which generates luminescent PQDs/MPMs@SiO2 hybrid microspheres with significantly enhanced stability. The obtained CsPbBr3‐PQDs/MPMs@SiO2 hybrid microspheres show a high photoluminescence quantum yield of 84%. More importantly, the MPMs@silica protective shells effectively cut off direct contact between outer erosive species and the inner embedded PQDs and modify the hybrid microspheres with ultralong alkyl chains for improved resistance to solvents and heat. Hence, these CsPbBr3‐PQDs/MPMs@SiO2 hybrid microspheres exhibit good chemical/physical stabilities, even when exposed to harsh environments, such as deionized water, isopropanol, acid/alkali solution, anion‐exchange reactions, and heating. Particularly, the water stability, which produced the remaining ≈48% proportion of the initial fluorescence intensity after a quite long aqueous storage period of 30 d, is the best reported among the stability‐related studies of PQDs. Meanwhile, white light‐emitting diodes (LEDs) are achieved by mixing green CsPbBr3‐PQDs/MPMs@SiO2 microspheres with red commercial phosphors on a blue chip. High power efficiency of 81 lm W−1 and good electroluminescence stability are obtained.

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Section: Resultsmentioning

confidence: 92%

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

Yang

Gao

Qiu

et al. 2019

Advanced Optical Materials

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“…Similarly, the EL spectra of the green and red CsPbX 3 QDs coated with mesoporous silica stacked on an InGaN blue chip displayed three sharp peaks; however, a warm white LED was realized by replacing the green QDs/SiO 2 with a YAG:Ce 3+ phosphor‐in‐glass via screen‐printing technology . Silica‐coated IHP QDs with improved air stability were also obtained by selecting (3‐aminopropyl)triethoxysilane (APTES) and perhydropolysilazane (PHPS) respectively as both the capping agent for IHP QDs and the precursor for a silica matrix . A schematic illustration of the formation of QD/silica composites obtained from APTES is shown in Figure d.…”

Section: Ihps For Backlighting Displaysmentioning

confidence: 99%

“…The white LED presented CIE color coordinates of standard white light (0.33, 0.33) and a power efficiency of 61.2 lm W −1 . The inorganic porous silica matrix, which was mechanically robust and airtight, can effectively protect perovskite NCs against harsh environmental conditions due to its good optical properties and higher chemical stability against environmental attributes …”

Section: Ihps For Backlighting Displaysmentioning

confidence: 99%

High‐Efficiency Pure‐Color Inorganic Halide Perovskite Emitters for Ultrahigh‐Definition Displays: Progress for Backlighting Displays and Electrically Driven Devices

et al. 2018

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reported by Huang's group. [13] In addition, Zhong and co-workers demonstrated a wide-color-gamut white backlighting display with 130% National Television Standards Committee (NTSC) 1931 using MAPbBr 3 quantum dots (QDs) by a ligandassisted reprecipitation technique. The percentage refers to the ratio of the RGB Commission Internationale de L'Eclairage (CIE) color gamut of the device and the NTSC color space. The NTSC color space with RGB CIE coordinates of (0.67, 0.33), (0.21, 0.71), and (0.14, 0.08) introduced in 1953 is commonly used to compare and specify color gamut coverage. The authors claimed that the findings introduced the possibility of improving the color performance of display technology. [14] Later, Zhong and co-workers fabricated efficient wide-color-gamut prototype white LEDs with luminous efficiency of 109 lm W −1 and 121% NTSC by integrating an in situ MAPbBr 3 composite film and a phosphor with blue InGaN chips. [15] Although OHP-based LEDs display excellent performance, the poor moisture, light, and thermal stability of OHPs have seriously limited their anticipated development and applications in real industrialization of corresponding devices.Fortunately, all-inorganic halide perovskites (IHPs), also known as CsPbX 3 (X = Cl, Br, I, or mixed Cl/Br and Br/I) have attracted great scientific attention given their improved thermal stability and higher PL QYs in comparison with OHPs. [16][17][18][19][20] Consistent efforts have been devoted to chemical synthesis of CsPbX 3 QDs. In 2015, Kovalenko and co-workers successfully synthesized CsPbX 3 nanocrystals (NCs) covering the entire visible spectral region of 410-700 nm, demonstrating high PL QYs up to 90% via a hot-injection method for the first time. [21] One year later, CsPbX 3 QDs with up to 90% and 95% of PL QYs, respectively, were developed by Zeng and co-workers according to supersaturated recrystallization (SR) at room temperature (RT), free from inert-gas protection and injection operation. [22] The PL QYs of RT SR-formed CsPbBr 3 QDs (about 30 °C) were comparable with those of hot-injection-formed QDs. Surprisingly, 0 °C SR-formed CsPbBr 3 QDs exhibited a QY as high as 95% due to lower defect density corresponding to a lower growth rate. Fully inorganic metal halide perovskite CsPbX 3 -based QDs, emitters with nearunity 100% PL QY, narrow and tunable optical bandgap, and improved stability have inspired applications of QDs in backlighting displays and electrically driven devices. [4,5,10,12,[23][24][25][26] Particularly, CsPbX 3 thin films constructed via simply spin-coating All-inorganic halide perovskites (IHPs) are ideal candidates for optoelectronic devices with outstanding emission color saturation, well-tunable optical bandgap, near-unity photoluminescence quantum yield (PL QY), and excellent solution processability. They appear to be promising materials for next-generation high-efficiency, wide-color-gamut, and flexible ultrahighdefinition (UHD) displays through the backlighting in liquid-crystal displays and electroluminescent dev...

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“…Park等 [106] 使用一种新型的全氢聚硅氮烷(perhydropolysilazane, PHPS)作为SiO 2 的前驱体, 在潮湿的空气中缓慢水解得到CsPbX 3 -SiO 2 稳定的复合物.…”

Section: 高的光稳定性和耐水性unclassified

How to enhance the stability of lead halide perovskite quantum dots?

et al. 2018

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Lead halide perovskite quantum dots (PQDs) have attracted plenty of attention in light-emitting diodes (LEDs) applications owing to their tunable bandgap, narrow bandwidth, high photoluminescence quantum yields (PL QYs), and facile fabrication. Despite applying PQDs in LEDs has found huge success, the poor stability greatly hampered their commercialization. The irreversible degradation driven by light, heat and open air leads to severely PL quenching, and then decreasing the electro-optical conversion efficiency of devices. The poor stability has attracted intense attention. Within a few years, a lot of interesting results have been published, and the reported stability of PQDs was greatly enhanced. This review describes some of the recent advances made in this area, and their applications in LED are summarized.

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Facile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamut

Cited by 91 publications

References 41 publications

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

High‐Efficiency Pure‐Color Inorganic Halide Perovskite Emitters for Ultrahigh‐Definition Displays: Progress for Backlighting Displays and Electrically Driven Devices

How to enhance the stability of lead halide perovskite quantum dots?

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Facile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamut

Cited by 91 publications

References 41 publications

CsPbBr3‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

CsPbBr3‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

High‐Efficiency Pure‐Color Inorganic Halide Perovskite Emitters for Ultrahigh‐Definition Displays: Progress for Backlighting Displays and Electrically Driven Devices

How to enhance the stability of lead halide perovskite quantum dots?

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Product

Resources

About

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs

CsPbBr₃‐Quantum‐Dots/Polystyrene@Silica Hybrid Microsphere Structures with Significantly Improved Stability for White LEDs