K-Alloyed Lead-free Double-Perovskite Cs2AgBiBr6 Nanocrystals for Use in Light-Emitting Diodes DOI
R. Sun,

Wangsheng Jiang,

Song Wang

et al.

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(16), P. 15247 - 15254

Published: Aug. 14, 2023

Lead-free double-perovskite nanocrystals (NCs) have emerged as a promising material to address the issues of instability and toxicity associated with lead-based materials. Metal ion doping or alloying strategies been widely used tailor optimize optical electrical properties semiconductor In this study, we prepared monodisperse Cs2AgBiBr6 NCs uniform morphology (8 ± 1 nm) excellent crystallinity using thermal injection method. Compared photoluminescence quantum yield (PLQY) (∼0.4%), highest PLQY Cs2Ag0.64K0.36BiBr6 reached 6.82%, an extended exciton lifetime from 2.08 10.64 ns, which is approximately 5.1 times longer. The binding energy (Eb) longitudinal phonon (ℏωop) were measured be 197.9 31.7 meV, respectively. For NCs, values Eb ℏωop determined 317.6 53.1 These results indicate that nonradiative recombination in weaker compared resulting improved PLQY. K+-alloyed exhibit potential for application light-emitting diodes.

Language: Английский

Boosting STE and Nd3+ NIR Luminescence in Cs2AgInCl6 Double Perovskite via Na+/Bi3+‐Induced Local Structure Engineering DOI Open Access

Shilin Jin,

He Yuan,

Tao Pang

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)

Published: Aug. 21, 2023

Abstract Currently, lanthanide (Ln 3+ ) doped Pb‐free double perovskites (DPs) suffer from competitive emissions of the self‐trapped exciton (STE) and Ln . Herein, a new type Nd ‐doped Cs 2 AgInCl 6 DPs with Na + /Bi co‐alloying is developed. Benefiting ‐induced local structural modification, both STE broadband visible luminescence near‐infrared (NIR) are boosted via free sensitization. Specifically, total 648‐fold enhancement in emitting intensities compared to ‐free counterpart realized, significantly improved NIR photoluminescence quantum yield (PLQY) 0.16% 30.3%. First‐principles density functional theory calculations, Raman spectra, steady/transient‐state PL spectra verify modification site symmetry, breakdown parity‐forbidden absorption, reduction electron‐phonon coupling doping. Finally, compact vis–NIR light‐emitting diode (LED) designed by Na/Bi/Nd: DP commercial ultraviolet LED chip, which shows promising applications spectroscopic analyses multifunctional lighting.

Language: Английский

Citations

56
Near‐Infrared Light Emitting Metal Halides: Materials, Mechanisms, and Applications DOI Creative Commons
Ying Liu, Francesco Di Stasio, Chenghao Bi

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(21)

Published: Feb. 21, 2024

Near-Infrared (NIR) light emitting metal halides are emerging as a new generation of optical materials owing to their appealing features, which include low-cost synthesis, solution processability, and adjustable properties. NIR-emitting perovskite-based light-emitting diodes (LEDs) have reached an external quantum efficiency (EQE) over 20% device stability 10,000 h. Such results sparked interest in exploring NIR halide emitters. In this review, several different types halides, including lead/tin bromide/iodide perovskites, lanthanide ions doped/based double low dimensional hybrid Bi

Language: Английский

Citations

51
Full-color, time-valve controllable and Janus-type long-persistent luminescence from all-inorganic halide perovskites DOI Creative Commons
Tianhong Chen, Dongpeng Yan

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: June 20, 2024

Abstract Long persistent luminescence (LPL) has gained considerable attention for the applications in decoration, emergency signage, information encryption and biomedicine. However, recently developed LPL materials – encompassing inorganics, organics inorganic-organic hybrids often display monochromatic afterglow with limited functionality. Furthermore, triplet exciton-based phosphors are prone to thermal quenching, significantly restricting their high emission efficiency. Here, we show a straightforward wet-chemistry approach fabricating multimode by introducing both anion (Br − ) cation (Sn 2+ doping into hexagonal CsCdCl 3 all-inorganic perovskites. This process involves establishing new trapping centers from [CdCl 6-n Br n ] 4− and/or [Sn 2-n Cd Cl 9 5− linker units, disrupting local symmetry host framework. These halide perovskites demonstrate duration time ( > 2,000 s), nearly full-color coverage, photoluminescence quantum yield ~ 84.47%), anti-thermal quenching temperature up 377 K. Particularly, : x %Br temperature-dependent time-valve controllable time-dependent luminescence, while %Sn exhibit forward reverse excitation-dependent Janus-type luminescence. Combining experimental computational studies, this finding not only introduces local-symmetry breaking strategy simultaneously enhancing lifetime efficiency, but also provides insights dynamic tunability photonics, high-security anti-counterfeiting storage.

Language: Английский

Citations

35
Beyond lead halide perovskites: Crystal structure, bandgaps, photovoltaic properties and future stance of lead-free halide double perovskites DOI
Venkatramanan Kumar, Arunkumar Kathiravan, Mariadoss Asha Jhonsi

et al.

Nano Energy, Journal Year: 2024, Volume and Issue: 125, P. 109523 - 109523

Published: March 22, 2024

Language: Английский

Citations

27
Rare‐Earth‐Based Lead‐Free Halide Double Perovskites for Light Emission: Recent Advances and Applications DOI

Zhihui Rao,

Xiujian Zhao, Xiao Gong

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: May 22, 2024

Abstract The double perovskite material of Cs 2 NaRECl 6 ‐type, utilizing rare‐earth (RE) ions as trivalent element, has attracted widespread interest due to its unique optoelectronic properties and wide range applications. It displays rich optical properties, including visible infrared light emission through down‐shifting, well up‐conversion radiation‐induced emission. These exceptional make it a promising for devices such detectors, light‐emitting diodes, lasers energy storage batteries but also show advantages in anti‐counterfeiting technology imaging. In this article, the latest progress is reported challenges crystal structure, preparation, performance, various applications lead‐free halide (HLDPs) compounds. This outline prospective research directions existing materials, with aim facilitating discovery new HLDPs materials.

Language: Английский

Citations

23
Cs2NaGdCl6:Tb3+─A Highly Luminescent Rare-Earth Double Perovskite Scintillator for Low-Dose X-ray Detection and Imaging DOI
V. Naresh, Pil‐Ryung Cha, Nohyun Lee

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(15), P. 19068 - 19080

Published: April 8, 2024

Rare-earth-based double perovskite (DP) X-ray scintillators have gained significant importance with low detection limits in medical imaging and radiation owing to their high light yield (LY) remarkable spatial resolution. Herein, we report the synthesis of 3D crystals, namely, Cs

Language: Английский

Citations

21
Near‐infrared emitting metal halide materials: Luminescence design and applications DOI Creative Commons
Dongjie� Liu, Peipei Dang,

Guodong Zhang

et al.

InfoMat, Journal Year: 2024, Volume and Issue: 6(5)

Published: March 28, 2024

Abstract Near‐infrared (NIR) luminescent metal halide (LMH) materials have attracted great attention in various optoelectronic applications due to their low‐temperature solution‐processable synthesis, abundant crystallographic/electronic structures, and unique properties. However, some challenges still remain luminescence design, performance improvement, application assignments. This review systematically summarizes the development of NIR LMHs through classifying origins into four major categories: band‐edge emission, self‐trapped exciton (STE) ion defect‐related emission. The mechanisms different types are discussed detail by analyzing typical examples. Reasonable strategies for designing optimizing luminescence/optoelectronic properties summarized, including bandgap engineering, self‐trapping state chemical composition modification, energy transfer, other auxiliary such as improvement synthesis scheme post‐processing. Furthermore, prospects based on devices revealed, phosphor‐converted light‐emitting diodes (LEDs), electroluminescent LEDs, photodetectors, solar cells, x‐ray scintillators, well demonstrations related practical applications. Finally, existing future perspectives LMH critically proposed. aims provide general understanding guidance design high‐performance materials. image

Language: Английский

Citations

20
Heterostructured Lanthanide Perovskite Nanoparticles with High Quantum Yield and Water Stability for Optical Information Storage DOI Open Access
Jiwei Li, Renrui Sun, Jiabo Chen

et al.

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Abstract In this study, heterostructured nanoparticles based on lanthanide double perovskite halide are innovatively proposed, which dramatically improved quantum yield and color purity, but the problem of water stability materials has also been solved. The without surface ligands have excellent optical properties when dispersed in water, higher purity than those organic solvents. Besides, application potential is demonstrated practical performance verified by preparing luminescent ink. This study provides a new strategy for enhancement prospect perovskite.

Language: Английский

Citations

2
Multimode Luminescence Tailoring and Improvement of Cs2NaHoCl6 Cryolite Crystals via Sb3+/Yb3+ Alloying for Versatile Photoelectric Applications DOI

Yingsheng Wang,

Peipei Dang, Lei Qiu

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(45)

Published: Sept. 19, 2023

Abstract Lead‐free halide double perovskites are currently gaining significant attention owing to their exceptional environmental friendliness, structural adjustability as well self‐trapped exciton emission. However, stable and efficient perovskite with multimode luminescence tunable spectra still urgently needed for multifunctional photoelectric application. Herein, holmium based cryolite materials (Cs 2 NaHoCl 6 ) anti‐thermal quenching photoluminescence were successfully synthesized. By the further alloying of Sb 3+ ( s ‐ p transitions) Yb f ions, its properties can be modulated, originating from tailoring band gap structure enriching electron transition channels. Upon substitution in Cs , additional absorption peaking at 334 nm results tremendous increase quantum yield (PLQY). Meanwhile, not only typical NIR emission around 980 Ho is enhanced, but also red emissions show a diverse range behaviors. Furthermore, through designing doping, up‐conversion triggered by changing excitation laser power density (yellow‐to‐orange) doping concentration (red‐to‐green). Through combined experimental‐theoretical approach, related mechanism revealed. In general, /Yb abundant energy level ladders constructed more modes derived, demonstrating great potential applications.

Language: Английский

Citations

35
An Er3+-Doped Cs2NaScCl6 Lead-Free Double Perovskite with Efficient Broadband Visible to Near-Infrared Emission and Multimodal Upconversion Luminescence DOI
Chunli Zhao, Yuan Gao, Tiantian Song

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2023, Volume and Issue: 14(40), P. 9011 - 9018

Published: Oct. 2, 2023

Lanthanide ions are widely used as dopants for halide perovskites their broad energy level coverage from the visible to near-infrared (NIR) range. In this work, Cs2NaScCl6:Er3+ was synthesized by an improved solid-state reaction method, which showed effective NIR emission under ultraviolet excitation. Through calculations based on density functional theory and Bader charge analysis, it is shown that [ErCl6]3- octahedra show a strong localization effect in lattice, conducive transfer process of Cl-Er3+, sensitization responsible efficient luminescence Er3+, where around λem = 1540 nm originated Er3+:4I13/2 → 4I15/2 transition with ultrahigh photoluminescence quantum yield reached ∼28.3%. Notably, also exhibited bright upconversion green light (at 540 nm) excitation variety laser diodes (808, 980, 1550 via self-sensitization processes.

Language: Английский

Citations

32