Cs4PbBr6/CsPbBr3 Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Huang, Chun-Yuan; Huang, Shuhan; Wu, Chin-Lin; Wang, Zi-Hao; Yang, Chih-Chiang

doi:10.1021/acsanm.0c02274

Cited by 26 publications

(23 citation statements)

References 37 publications

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“…Such strong absorptions are attributed to the 1 S 0 → 3 P 1 transition of Pb 2+ centres. 37 On the other hand, the sharp absorption cutoff of transparent Cs 4 PbBr 6 occurs around 357 nm, which is obviously different from that of colored Cs 4 PbBr 6 as sharp absorption cutoffs occur around 361 and 554 nm in colored Cs 4 PbBr 6 SCs, which are deemed as the absorption edges. The first cutoff is deemed as the intrinsic absorption edge of pure Cs 4 PbBr 6 , which exhibits a red shift compared with other reports, 32,38 suggesting stronger absorption ability of our Cs 4 PbBr 6 SC.…”

Section: Resultsmentioning

confidence: 98%

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Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals

Wang

Yuan

et al. 2021

J. Phys. Chem. C

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The isolated [PbBr 6 ] octahedra in the zero-dimensional (0-D) perovskite Cs 4 PbBr 6 crystal lattice trigger localized optical transitions, which exhibits extremely unique optical properties and brings controversial topics concerning its optical properties, particularly about its photoluminescence (PL) nature. Herein, we successfully grown a series of large-scale Cs 4 PbBr 6−m X m (X = Cl, I) single crystals (SCs) from Cs-rich solutions, partially replacing Br with Cl and I, taking advantage of superiorities from SCs to explore optical behavior and eliminate the mutual transformation distraction between Cs 4 PbBr 6 and CsPbBr 3 . No CsPbBr 3 is detected in our Cs 4 PbBr 6−m X m (X = Cl, I) large SCs, whereas they exhibit obvious PL phenomena. It is revealed that the Cs 4 PbBr 6 SC exhibits intense PL, and the replacements of Br with Cl and I can regularly alter the crystal lattice, optical absorption cutoffs, and PL positions and bring multiple PL peaks, among which one is attributed to the Br vacancy (V Br ) and another originates from crystal lattice distortions triggered by both halogen replacements. Therefore, we proposed that the PL nature of CsPbBr 3−m X m (X = Cl, I) SCs originates from crystal lattice distortions that can be induced by both halogen replacements and V Br . Severe local lattice distortion, for example, in Cs 4 PbBr 6 films and powders, definitely can induce Cs 4 PbBr 6−m X m to transform toward CsPbBr 3 and therefore enhance the PL yield.

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Section: Resultsmentioning

confidence: 98%

“…The introduction of Cl ions into SC leads to an absorption peak blue shift to 300 nm. Such strong absorptions are attributed to the 1 S 0 → 3 P 1 transition of Pb 2+ centres …”

Section: Resultsmentioning

confidence: 98%

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals

Wang

Yuan

et al. 2021

J. Phys. Chem. C

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“…In spite of the lack of understanding of the origin of the emission, the high solid-state PLQY and improved photostability of the 0D perovskites make them the most promising candidates for LED applications in the perovskite family. Several recent studies demonstrated that the inclusion of 0D perovskites in 3D perovskite films led to significant PL efficiency enhancement and higher current efficiency and external quantum efficiency in LEDs compared to the pure 3D devices. ,− However, in all of these cases, the 0D component (thin film) was non-emissive and acted only as a matrix/encapsulation layer to passivate the 3D surface. It was proposed that the 0D component can provide either dielectric confinement to the 3D part, enhancing its oscillator strength and absorption cross-section, or type-I confinement that enforces radiative recombination of the 3D core, or can enhance the emission by energy transfer from 0D to 3D .…”

Section: Optoelectronic Properties Of Low-dimensional Perovskitesmentioning

confidence: 99%

Single-Particle Spectroscopy as a Versatile Tool to Explore Lower-Dimensional Structures of Inorganic Perovskites

et al. 2021

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The remarkable defect-tolerant nature of inorganic cesium halide perovskites, leading to near unity photoluminescence (PL) quantum yield and narrow emission line width across the entire visible spectrum, has provided a tantalizing platform for the development of a plethora of light-emitting applications. Recently, lower-dimensional (2D, 1D, and 0D) perovskites have attracted further attention due to their enhanced thermal, photo, and chemical stability as compared to their three-dimensional (3D) analogues. The combination of external size quantization and internal octahedral organization provides a unique opportunity to study and harness “multi-dimensional” electronic properties engineered on both atomic scale and nanoscale. However, crucial research to understand the elementary charge carrier dynamics in lower-dimensional perovskites lags far behind the enormous effort to incorporate them into optoelectronic devices. In this Perspective, we provide a review of recent developments that focus on studies of the dynamics of excitonic complexes in Cs-based perovskite nanocrystals using single-particle time-resolved PL spectroscopy and photon correlation measurements. Single-photon statistical studies not only offer an unprecedented level of detail to directly assess various recombination pathways, but also provide insights into specifics of the charge carriers' localization. We discuss the underlying physicochemical processes that govern PL emission and draw attention to a number of attributes within this class of the materials, especially lower-dimensional perovskites, that may indicate the common origin of the PL emission as well as provide a route map for the vast unexplored territories where single-particle spectroscopy can be a powerful tool to unravel crucial information.

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“…Motivated by their promising applications in optoelectronics, synthesis techniques of organic-inorganic hybrid and all-inorganic lead halide perovskites (AILHPs) in forms of powder and nanocrystals (NCs) with improved characteristics have gained remarkable developments in the last decade [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Despite those astonishing breakthroughs, e.g., the ultrahigh power conversion efficiency in solar cells and theoretically high external quantum efficiency in perovskite light-emitting diodes (PeLEDs) [ 2 , 3 ], the transition of halide perovskite devices from the laboratory into commercial products has been greatly hindered by their poor stabilities and phase transition/deformation tendencies [ 9 , 10 ]. Actually, three-dimensional (3D) AILHPs (CsPbX 3 ) show higher thermal decomposition stability for the inorganic nature when compared to their hybrid counterpart [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Bright CsPbBr3 Perovskite Nanocrystals with Improved Stability by In-Situ Zn-Doping

Zeng

Chang

et al. 2022

Nanomaterials

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In this study, facile synthesis, characterization, and stability tests of highly luminescent Zn-doped CsPbBr3 perovskite nanocrystals (NCs) were demonstrated. The doping procedure was performed via partial replacement of PbBr2 with ZnBr2 in the precursor solution. Via Zn-doping, the photoluminescence quantum yield (PLQY) of the NCs was increased from 41.3% to 82.9%, with a blue-shifted peak at 503.7 nm and narrower spectral width of 18.7 nm which was consistent with the highly uniform size distribution of NCs observed from the TEM image. In the water-resistance stability test, the doped NCs exhibited an extended period-over four days until complete decomposition, under the harsh circumstances of hexane-ethanol-water mixing solution. The Zn-doped NC film maintained its 94% photoluminescence (PL) intensity after undergoing a heating/cooling cycle, surpassing the un-doped NC film with only 67% PL remaining. Based on our demonstrations, the in-situ Zn-doping procedure for the synthesis of CsPbBr3 NCs could be a promising strategy toward robust and PL-efficient nanomaterial to pave the way for realizing practical optoelectronic devices.

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Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Cited by 26 publications

References 37 publications

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals

Single-Particle Spectroscopy as a Versatile Tool to Explore Lower-Dimensional Structures of Inorganic Perovskites

Bright CsPbBr3 Perovskite Nanocrystals with Improved Stability by In-Situ Zn-Doping

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Cs4PbBr6/CsPbBr3 Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Cited by 26 publications

References 37 publications

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs4PbBr6–mXm (X = Cl, I) Single Crystals

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs4PbBr6–mXm (X = Cl, I) Single Crystals

Single-Particle Spectroscopy as a Versatile Tool to Explore Lower-Dimensional Structures of Inorganic Perovskites

Bright CsPbBr3 Perovskite Nanocrystals with Improved Stability by In-Situ Zn-Doping

Contact Info

Product

Resources

About

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals

Understanding of the Photoluminescence Mechanism Based on Zero-Dimensional Cs₄PbBr_6–mX_m (X = Cl, I) Single Crystals