Efficient white LEDs with bright green-emitting CsPbBr3 perovskite nanocrystal in mesoporous silica nanoparticles

Di, Xiaoxuan; Shen, Ludi; Jiang, Junguang; He, Meiling; Cheng, Yinzi; Zhou, Lei; Liang, Xiaojuan

doi:10.1016/j.jallcom.2017.09.213

Cited by 69 publications

(34 citation statements)

References 36 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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“…Sample was prepared by using spin coating on the silicon glass. The most common planes in cubic CsPbBr 3 perovskite quantum dots (100), (110), (200), (211) are oriented in 15.18°, 21.55°, 30.64°, and 37.77°with respect to two-theta values in the literature [28]. The same planes in cubic CsPbI 3 QDs were also reported as 14.32°, 20.30°, 28.87°, 35.55°, XRD pattern of the CsPbBr 3 PQDs slightly shifts to the small angle values with the substitution of the iodide inside the structure of PQDs [24,25].…”

Section: Resultsmentioning

confidence: 99%

Cesium lead based inorganic perovskite quantum-dots as interfacial layer for highly stable perovskite solar cells with exceeding 21% efficiency

et al. 2019

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Despite the excellent photovoltaic performances of perovskite solar cells (PSCs), the instability of PSCs under severe environment (e.g. humidity, light-induced, etc.) limits further commercialization of such devices. Therefore, in recent years, research on the long-term stability improvement of PSCs has been actively carried out in perovskite field. To address these issues, we demonstrated the incorporation of ultra-thin interfacial layer of inorganic CsPbBr 1.85 I 1.15 perovskite quantum-dots (PQDs) that can effectively passivate defects at or near to the perovskite/hole transport material (HTM) interface, significantly suppressing interfacial recombination. This passivation layer increased the open circuit voltage (V oc ) of triple-cation perovskite cells by as much as 50 mV, with champion cells achieving V oc ∼ 1.14 V. As a result, we obtained hysteresis-free cells with the efficiency beyond 21%. More importantly, devices based on such architecture are capable of resisting humidity and lightinduced. Remarkably, the device employing CsPbBr 1.85 I 1.15 demonstrated a superb shelf-stability aganist to humidity under ambient conditions (R.H.≥40%), retaining nearly 91% of initial efficiency after 30 days, while the efficiency of control device rapidly dropped to 45% from its initial value under the same conditions. Besides benefiting from the high moisture resistivity as well as supressed ion migration, PSCs based on PQDs showed better operational stability (retaining 94% of their initial performance) than that of the PQDs-free one under continuous light irradiation over 400 h. In addition, a faster PL decay time of 4.66 ns was attained for perovskite/PQDs structure (5.77 ns for only PQDs structure) due to the favorable energy transfer at the interface, indicating a Förster resonance energy transfer (FRET) mechanism. This work indicates that inorganic PQDs are important materials as interlayer in PSCs to supremely enhance the device stability and efficiency.

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“…As shown in Figure D,E, the Cl 2p peak can be fitted into two peaks (2p 3/2 , 2p 1/2 ) with binding energies of 199.8 and 198.2 eV, meanwhile the Br 3d peak can be also fitted into two peaks (3d 3/2 , 3d 5/2 ) with binding energies of 77.35 and 75.21 eV. More interesting, the spectral peaks appear close enough to each other to overlap, which correspond to the inner and surface ions . As we expected that the small binding energy peaks at 643.4 eV, corresponding to Mn 2p core‐levels which are detected only in the Mn‐doped CsPb(Cl/Br) 3 QDs .…”

Section: Resultsmentioning

confidence: 54%

Doping manganese into CsPb(Cl/Br)₃ quantum dots glasses: Dual‐color emission and super thermal stability

Cheng

Shen

et al. 2018

J Am Ceram Soc

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CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) represent bright and tunable photoluminescence, it is regrettable that the air instability and poor water resistant properties prevent their application in optoelectronic devices. At the same time, the toxicity of lead is also a major factor restricting its development. As a consequence, we demonstrate the partial replacement of Pb with Mn through conventional melt‐quenching and heat‐treatment method preparation of Mn‐doped CsPb(Cl/Br)3 QD glass. Mn‐doped CsPb(Cl/Br)3 QD glass exhibits high luminescent intensity like QDs. It is important that Mn‐doped CsPb(Cl/Br)3 QD glass with Dual‐Color maintained the same lattice structure like Mn‐doped CsPb(Cl/Br)3 QDs, and highly homogeneous spectral characteristics of Mn luminescence. The intensity and position of this Mn‐related emission are also tunable by altering the experimental parameters, such as the Pb‐to‐Mn feed ratio, annealing temperature. More importantly, the as‐prepared orange Mn‐doped CsPb(Cl/Br)3 QD glass was employed to fabricate white LEDs combined with a commercial Ce3+:Y3Al5O12 phosphor‐in‐glass (Ce‐PiG) on top of a InGaN blue chip. And the constructed WLEDs generate a warm white with an optimal luminous efficacy (LE) of 67.00 lm/W, a high CRI of 81.4, and a low CCT of 4902 K.

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Efficient white LEDs with bright green-emitting CsPbBr3 perovskite nanocrystal in mesoporous silica nanoparticles

Cited by 69 publications

References 36 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

Cesium lead based inorganic perovskite quantum-dots as interfacial layer for highly stable perovskite solar cells with exceeding 21% efficiency

Doping manganese into CsPb(Cl/Br)₃ quantum dots glasses: Dual‐color emission and super thermal stability

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Efficient white LEDs with bright green-emitting CsPbBr3 perovskite nanocrystal in mesoporous silica nanoparticles

Cited by 69 publications

References 36 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

Cesium lead based inorganic perovskite quantum-dots as interfacial layer for highly stable perovskite solar cells with exceeding 21% efficiency

Doping manganese into CsPb(Cl/Br)3 quantum dots glasses: Dual‐color emission and super thermal stability

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Product

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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

Doping manganese into CsPb(Cl/Br)₃ quantum dots glasses: Dual‐color emission and super thermal stability