Super-Hydrophobic Cesium Lead Halide Perovskite Quantum Dot-Polymer Composites with High Stability and Luminescent Efficiency for Wide Color Gamut White Light-Emitting Diodes

Xuan, Tongtong; Huang, Junjian; Huan, Liu; Lou, Sunqi; Cao, Linglong; Gan, Weijiang; Liu, Ru‐Shi; Wang, Jing

doi:10.1021/acs.chemmater.8b04596

Cited by 215 publications

(158 citation statements)

References 43 publications

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“…Table 1. The reliability of our AeroPQDs with open structure is comparable to that of previously reported PQDs embedded in an enclosed organic polymer matrix, [33][34][35] and higher than that of PQDs embedded in all inorganic matrices. www.advmattechnol.de is 5:1, no reduction in PL stability occurs even after 120 h. Therefore, the moisture reliability of AeroPQDs with a suitable mass ratio is significantly stronger than that of PQDs when compared in the liquid state.…”

Section: Wwwadvmattechnoldesupporting

confidence: 83%

“…One reasonable explanation is that PQDs can be only adsorbed on the surface of SBA-15 due to the mismatched size between the pore and the particle, which is verified by the TEM image shown in Figure S16 (Supporting Information). Previous studies on the enclosed polymer organic matrix indicate that the surface structure plays the key role to enhance the water stability for PQDs, [34] however, it shows great differences in the situation for protected PQDs with open structure. Furthermore, the protected PQDs integrated with the less hydrophobic aerogel achieves strong PL even after 24 h as shown in Figure S15b (Supporting Information), and are hence more stable than the PQD powders without protection (see Figure 5b) and then the protected PQDs integrated with SBA-15 (see Figure S15a in the Supporting Information).…”

Section: Wwwadvmattechnoldementioning

confidence: 98%

“…While protected PQDs with high chemical, thermal, and irradiation stabilities have been obtained, [28] the water stability of PQDs prepared with these inorganic shells still indicate a lot of room for improvement. [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their…”

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confidence: 99%

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Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Song

et al. 2020

Adv Materials Technologies

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hence have drawn a lot of attention as down-conversion materials for white lightemitting diodes (WLEDs). [7][8][9][10] For practical applications, the cost-effectiveness, the optical performance, and the stability of PQDs should be further improved. [4] Particularly, PQDs suffer from low chemical and optical stabilities, resulting in their fast degradation under exposure to moisture, heat, and light irradiance. [11,12] Accordingly, PQDs exhibit much lower stability than conventional rare-earth-based phosphor materials. [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 . [30] Generally, the protective shells of PQDs are prepared using these inorganic materials by in situ synthesis. While protected PQDs with high chemical, thermal, and irradiation stabilities have been obtained, [28] the water stability of PQDs prepared with these inorganic shells still indicate a lot of room for improvement. For instance, the PL intensity of CaF 2 shell-integrated green PQDs reduces to <50% after a water-resistance test of ≈40 h. [20] Consequently, and until now, PQDs with high water stability are achieved by embedding them in enclosed organic polymer and glass matrices. [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their At present, most of lead halide perovskite quantum dots (PQDs) embedded in an enclosed organic polymer or glass matrix can achieve high water stability, yet this limits their subsequent integration with light-emitting diodes (LEDs) and other functional materials. Herein, a postadsorption process using superhydrophobic aerogel inorganic matrix (S-AIM) with open structures is presented to enhance water stability of PQDs and compose newfunctions to them such as magnetism. The CsPbBr 3 PQDs integrated with the S-AIM (AeroPQDs) exhibit a high relative photoluminescence quantum yield (PLQY, 75.6%) of 90.9% compared to pristine PQDs (PLQY, 83.2%). They preserve their initial PL intensity after 11 days of soaking in water and achieve a high relative PLQY stability (50.5%) after soaking for 3.5 months. The hydrophobic (rough) surface of the matrix, its pores with a well-matched mean diameter that promotes the homogeneous integration of PQDs and hinders the penetration of water as well as the oleophylic functional groups covering the surface of these pores are the three factors responsible for the high water stability. Finally, AeroPQDs are easily integrated with other functional nanomaterials, such as Fe 3 O 4 nanoparticles for magnetic manipulation, due to their open structure.

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Section: Wwwadvmattechnoldesupporting

confidence: 83%

Section: Wwwadvmattechnoldementioning

confidence: 98%

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confidence: 99%

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Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Song

et al. 2020

Adv Materials Technologies

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“…All these properties of lead halide perovskites are superior to typical Cd‐based quantum dots (QDs). Because of these superior properties, tri‐halide lead perovskites have been widely investigated and employed in modern optoelectronic devices including solar cells, LEDs, and photodetectors . Although, all‐inorganic lead halide perovskite (CsPbX 3 ) NC‐based optoelectronic devices exhibit higher stability compared to their organic–inorganic hybrid counterparts.…”

Section: Introductionmentioning

confidence: 99%

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Adhikari

Thapa

Zhu

et al. 2019

Advanced Optical Materials

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All‐inorganic halide perovskites (CsPbX3, X = Cl−, Br−, and I−) are brought to the forefront of research focus in the field of modern lighting technology. However, due to the toxic element (Pb2+), environmentally friendly white‐light emissions are difficult to achieve, thus limiting their practical applications. Herein, high‐quality Mg2+‐alloyed CsPb1−x Mgx X3 (up to 20%) nanocrystals (NCs) are synthesized. The structural and optical properties are investigated. The application of these NCs in white‐light‐emitting diodes (LEDs) is also demonstrated. The incorporation of Mg2+ into CsPb1−x Mgx X3 NCs results in a lattice contraction without a change in structure and morphology, blue‐shifts in the photoluminescence emission, and increased bandgap. Then, the tunable emission (≈408–650 nm) is obtained by adjusting the compositions of different halides (for 20% Mg2+). Most importantly, for the first time, 3D printed thin color conversion layers for different color emitting NCs (green, yellow, and red) are stacked on top of the blue‐LEDs to achieve high‐quality white light emission. A bright neutral white‐light with a correlated‐color temperature of 5806 K, a high color‐rendering index of 89, CIE coordinates of (0.32, 0.33), a small Duv (<0.003), and high luminous efficacy of radiation of 280 lm W−1 is achieved.

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“…The highest power efficiency, which reached 68.2 lm W −1 , could be improved by increasing the chip efficiency by adopting a remote configuration structure or by reducing the scattering of light . The color gamut of a selected triangle of red, green, and blue emitting CsPbX 3 NC is 1.29 times wider than the NTSC standard . To sum up, we confidently envision that these CsPbX 3 ‐KL composites have good potential as phosphors for light or as display backlight applications.…”

Section: Resultsmentioning

confidence: 94%

Self‐Assembly of Completely Inorganic Perovskite Nanocrystals with Improved Stability by Anchoring on Kaolinite Lamellae

et al. 2020

Advanced Optical Materials

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Completely inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) are attracting increasing attention due to their outstanding luminescent properties, but their inherently poor stability is a severe impediment to further practical applications. Here, a facile two‐step synthetic procedure for preparing highly stable CsPbX3 NCs with the assistance of kaolinite lamellae (KL) is demonstrated. Systematic investigation shows that the cesium ions can be anchored tightly to the KL with the aid of strong Coulombic force interactions. These trigger the efficient growth of orthorhombic phase CsPbX3 NCs on the KL surfaces in a highly ordered manner. As a benefit of the inhibited aggregation caused by isolation and the anchoring effect of KL, the CsPbBr3‐KL composites display high luminescent efficiency (up to 73.0%) and excellent stability in air (>240 h). An efficient, stable, white light‐emitting diode device is fabricated by packaging green CsPbBr3‐KL and red CsPb(Br0.5I0.5)3‐KL composites on a blue GaN chip. These findings demonstrate the first attempt to improve the stability of CsPbX3 NCs by designing composites with materials having natural layers. This should shed important light on the preparation of high‐efficiency, stable, and color‐tunable perovskite materials for applications requiring high‐performance devices.

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Super-Hydrophobic Cesium Lead Halide Perovskite Quantum Dot-Polymer Composites with High Stability and Luminescent Efficiency for Wide Color Gamut White Light-Emitting Diodes

Cited by 215 publications

References 43 publications

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Self‐Assembly of Completely Inorganic Perovskite Nanocrystals with Improved Stability by Anchoring on Kaolinite Lamellae

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Super-Hydrophobic Cesium Lead Halide Perovskite Quantum Dot-Polymer Composites with High Stability and Luminescent Efficiency for Wide Color Gamut White Light-Emitting Diodes

Cited by 215 publications

References 43 publications

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Mg2+‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Self‐Assembly of Completely Inorganic Perovskite Nanocrystals with Improved Stability by Anchoring on Kaolinite Lamellae

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Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method