State of the Art and Prospects for Halide Perovskite Nanocrystals

ACS Nano, Journal Year: 2021, Volume and Issue: 15(7), P. 10775 - 10981

Published: June 17, 2021

Metal-halide perovskites have rapidly emerged as one of the most promising materials 21st century, with many exciting properties and great potential for a broad range applications, from photovoltaics to optoelectronics photocatalysis. The ease which metal-halide can be synthesized in form brightly luminescent colloidal nanocrystals, well their tunable intriguing optical electronic properties, has attracted researchers different disciplines science technology. In last few years, there been significant progress shape-controlled synthesis perovskite nanocrystals understanding applications. this comprehensive review, having expertise fields (chemistry, physics, device engineering) joined together provide state art overview future prospects nanocrystal research.

Language: Английский

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Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(40)

Published: July 10, 2021

Abstract Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting halides remains a challenge. Here, an enlightening prototype is proposed to explore high‐efficiency broadband NIR systems by incorporating Sb 3+ into Cs 2 ZnCl 4 matrix. Combined experimental analysis density functional theory calculations reveal modified self‐trapped excitons model elaborate emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm large full width half maximum 175 nm, along excellent air/thermal stability, show unique advantages lead‐free :Sb as source. substitution Cl − Br further enables red‐shift peak from 823 nm. diode device based on demonstrates potential non‐visible source night vision. This study puts forward effective strategy design novel eco‐friendly emissive provides guidance for expanding scope luminescent halides.

Language: Английский

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Lead‐Free Double Perovskite Cs₂AgInCl₆

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 60(21), P. 11592 - 11603

Published: Oct. 21, 2020

Lead-free halide perovskites have drawn wide attention as alternatives to their toxic and poorly stable lead-based counterparts. Among them, double with Cs2 AgInCl6 composition, often doped various elements, been in the spotlight owing intriguing optical properties, namely, self-trapped exciton (STEs) emission dopant-induced photoluminescence. This interest has sparked different synthesis approaches towards both crystals nanocrystals, exploration of many alloy compositions mono- trivalent cations other than Ag+ In3+ . In this Minireview we describe recent developments on bulk strategies, intrinsic tunable photoluminescence originating from alloying doping effects. We also discuss progress computational studies aimed at understanding thermodynamic stability, role defects, origin relation STEs direct band gap character.

Language: Английский

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ns² Electron (Bi³⁺ and Sb³⁺) Doping in Lead-Free Metal Halide Perovskite Derivatives

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(24), P. 10255 - 10267

Published: Dec. 3, 2020

Bi3+ and Sb3+ doping (and codoping with lanthanides) in Cs2SnCl6 vacancy ordered perovskites Cs2MInCl6 (M = Na, K, Ag) double has been shown to open up new opportunities for solid state lighting. ns2 outer electronic configuration can tailor both optical absorption emission properties phosphor-converted light emitting diode (pc-LEDs) applications. Therefore, the s-electron dopants (Bi3+ Sb3+) act as sensitizers emitters. This is because dopant s-electrons contribute near band edges of host, unlike cases d- f-electron dopants. Consequently, also a sensitizer lanthanide luminescence systems like Bi3+-Ln3+ codoped Cs2AgInCl6, where Ln Er, Yb, Tb. In this perspective, we provide insights on tailoring by electron doping. These are then connected rational design hosts, dopants, codopants, their potential Finally, discuss challenges future research.

Language: Английский

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Compact ultrabroadband light-emitting diodes based on lanthanide-doped lead-free double perovskites

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: March 8, 2022

Impurity doping is an effective approach to tuning the optoelectronic performance of host materials by imparting extrinsic electronic channels. Herein, a family lanthanide (Ln3+) ions was successfully incorporated into Bi:Cs2AgInCl6 lead-free double-perovskite (DP) semiconductor, expanding spectral range from visible (Vis) near-infrared (NIR) and improving photoluminescence quantum yield (PLQY). After multidoping with Nd, Yb, Er Tm, Bi/Ln:Cs2AgInCl6 yielded ultrabroadband continuous emission spectrum full width at half-maximum ~365 nm originating intrinsic self-trapped exciton recombination abundant 4f-4f transitions Ln3+ dopants. Steady-state transient-state spectra were used ascertain energy transfer emissive processes. To avoid adverse interactions between various in single DP host, heterogeneous architecture designed spatially confine different dopants via "DP-in-glass composite" (DiG) structure. This bottom-up strategy endowed prepared Ln3+-doped DIG high PLQY 40% (nearly three times as that multidoped DP) superior long-term stability. Finally, compact Vis-NIR (400~2000 nm) light source easily fabricated coupling DiG commercial UV LED chip, this has promising applications nondestructive spectroscopic analyses multifunctional lighting.

Language: Английский

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Light Emission of Self‐Trapped Excitons in Inorganic Metal Halides for Optoelectronic Applications

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(52)

Published: March 24, 2022

Abstract Self‐trapped excitons (STEs) have recently attracted tremendous interest due to their broadband emission, high photoluminescence quantum yield, and self‐absorption‐free properties, which enable a large range of optoelectronic applications such as lighting, displays, radiation detection, special sensors. Unlike free excitons, the formation STEs requires strong coupling between excited state soft lattice in low electronic dimensional materials. The chemical structural diversity metal halides provides an ideal platform for developing efficient STE emission Herein, overview recent progress on materials is presented. relationships fundamental mechanisms, compositions, device performances are systematically reviewed. On this basis, currently existing challenges possible development opportunities field

Language: Английский

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Lead‐Free Halide Double Perovskite Nanocrystals for Light‐Emitting Applications: Strategies for Boosting Efficiency and Stability

Advanced Science, Journal Year: 2021, Volume and Issue: 8(7)

Published: March 3, 2021

Abstract Lead‐free halide double perovskite (HDP) nanocrystals are considered as one of the most promising alternatives to lead due their unique characteristics nontoxicity, robust intrinsic thermodynamic stability, rich and tunable optoelectronic properties. Although lead‐free HDP variants with highly efficient emission synthesized characterized, photoluminescent (PL) properties colloidal still have enormous challenges for application in light‐emitting diode (LED) devices surface defects, indirect band, disallowable optical transitions. Herein, recent progress on synthetic strategies, ligands passivation, metal doping/alloying boosting efficiency stability is comprehensive summarized. It begins by introducing crystalline structure, electronic PL mechanism HDPs. Next, limiting factors origins instability analyzed, followed highlighting effects synthesis Then, preliminary applications LED emphasized. Finally, prospects concerning development stable nanocrystals‐based future proposed.

Language: Английский

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Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospective

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(6)

Published: Oct. 27, 2023

Abstract Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, emerged as promising candidates for high‐performance solar cells, light‐emitting diodes (LEDs), lasers, photodetectors, radiation detectors. The impressive optical optoelectronic properties, along with rapid increase efficiencies cells LEDs, greatly attracted researchers across many disciplines. However, most advances made so far terms preparation (colloidal nanocrystals films), devices highest are based on Pb‐based halide which raised concerns over their commercialization due to toxicity Pb. This has triggered search lower‐toxicity Pb‐free perovskites led significant progress last few years. In this roadmap review, different expertise joined together summarize latest progress, outstanding challenges, future directions perovskite regarding synthesis, spectroscopy, devices, guide currently working area well those that will join field future.

Language: Английский

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Boosting the Self‐Trapped Exciton Emission in Alloyed Cs₂(Ag/Na)InCl₆ Double Perovskite via Cu⁺ Doping

Advanced Science, Journal Year: 2022, Volume and Issue: 9(7)

Published: Jan. 17, 2022

Fundamental understanding of the effect doping on optical properties 3D double perovskites (DPs) especially dynamics self-trapped excitons (STEs) is vital importance for their optoelectronic applications. Herein, a unique strategy via Cu+ to achieve efficient STE emission in alloyed lead-free Cs2 (Ag/Na)InCl6 DPs reported. A small amount (1.0 mol%) results boosted crystals, with photoluminescence (PL) quantum yield increasing from 19.0% 62.6% and excitation band shifting 310 365 nm. Temperature-dependent PL femtosecond transient absorption spectroscopies reveal that remarkable enhancement originates increased radiative recombination rate density STEs, as result symmetry breakdown wavefunction at octahedral Ag+ site. These findings provide deep insights into -doped , thereby laying foundation future design new emission.

Language: Английский

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Sb³⁺–Er³⁺‐Codoped Cs₂NaInCl₆for Emitting Blue and Short‐Wave Infrared Radiation

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(32)

Published: April 11, 2022

Cs2 NaInCl6 double perovskite is stable, environmentally benign and easy to prepare. But it has a wide band gap (5.1 eV), therefore, does not show optical optoelectronic properties in the visible short-wave infrared (SWIR) region. Here we introduce such functionalities by codoping Sb3+ (s-electron doping) Er3+ (f-electron ions. doping introduces optically allowed 5s2→ 5s1 5p1 electronic absorption at sub-band level, which then emits blue photoluminescence with ≈93 % quantum yield. f-f of parity forbidden. Codoping -Er3+ , leads transfer excitation energy from yielding SWIR emission 1540 nm. Temperature (6 300 K) dependent measurements elucidate mechanism. A phosphor converted light emitting diode (pc-LED) fabricated using codoped sample stable radiation over prolonged (84 hours) operation 5.1 V.

Language: Английский

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