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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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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Efficient White Photoluminescence from Self-Trapped Excitons in Sb³⁺/Bi³⁺-Codoped Cs₂NaInCl₆ Double Perovskites with Tunable Dual-Emission

ACS Energy Letters, Journal Year: 2021, Volume and Issue: 6(9), P. 3343 - 3351

Published: Aug. 30, 2021

Efficient and stable inorganic lead-free halide perovskites have attracted tremendous attention for next-generation solid-state lighting. However, single perovskite phosphors with strong, tunable-color-temperature white-light emission are rare. Here, a doping strategy was developed to incorporate Sb3+ Bi3+ ions into Cs2NaInCl6 crystals. Blue yellow white light 77% quantum yield observed. The dual-emission originates from different [SbCl6]3– octahedron-related self-trapped excitons (STEs). blue is attributable limited Jahn–Teller deformation doping. Large-radii increase the level of octahedron, enhancing STE emission. Density functional theory calculations indicated that forms sub-band level, which produces Tuning between warm cold can be realized by changing Sb3+/Bi3+ ratio, suggests unique interaction mechanism dopants, as well Bi3+-induced lattice distortion in double perovskites.

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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Colloidal Metal‐Halide Perovskite Nanoplatelets: Thickness‐Controlled Synthesis, Properties, and Application in Light‐Emitting Diodes

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(10)

Published: Nov. 14, 2021

Abstract Colloidal metal‐halide perovskite nanocrystals (MHP NCs) are gaining significant attention for a wide range of optoelectronics applications owing to their exciting properties, such as defect tolerance, near‐unity photoluminescence quantum yield, and tunable emission across the entire visible wavelength range. Although optical properties MHP NCs easily through halide composition, they suffer from light‐induced phase segregation that limits use in devices. However, MHPs can be synthesized form colloidal nanoplatelets (NPls) with monolayer (ML)‐level thickness control, exhibiting strong confinement effects, thus enabling by controlling bromide or iodide‐based lead‐halide NPls. In addition, NPls exhibit narrow peaks, have high exciton binding energies, higher fraction radiative recombination compared bulk counterparts, making them ideal candidates light‐emitting diodes (LEDs). This review discusses state‐of‐the‐art NPls: synthetic routes, thickness‐controlled synthesis both organic–inorganic hybrid all‐inorganic NPls, linear nonlinear (including charge‐carrier dynamics), performance LEDs. Furthermore, challenges associated synthesis, environmental thermal stability, application efficient LEDs discussed.

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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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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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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Dopant and Compositional Modulation Triggered Broadband and Tunable Near-Infrared Emission in Cs₂Ag_1–xNa_xInCl₆:Cr³⁺ Nanocrystals

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(7), P. 3006 - 3012

Published: March 29, 2022

Lead-free halide perovskite nanocrystals (NCs) have attracted more attention and demonstrated versatile potential in optoelectronic applications. However, achieving broadband near-infrared (NIR) emission such materials remains a challenge. Herein, we successfully obtained Cr3+-doped Cs2AgInCl6 NCs via hot-injection synthesis, which exhibits NIR with large full width at half-maximum of 193 nm. Furthermore, tunable from 998 to 958 nm along an enhanced photoluminescence quantum yield 19.7% is realized by gradually substituting Ag+ Na+, the blue shift luminescence behavior attributed strengthened crystal field around Cr3+. The excellent chemical moisture stability together as-fabricated Cs2NaInCl6:Cr3+ NC film made screen printing showcases its application high-resolution images fluorescent signs. This work proves possibility realizing lead-free provides guidance for expanding their region.

Language: Английский

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