Efficient and Stable Multicolor Emissions of the Coumarin‐Modified Cs₃LnCl₆ Lead‐Free Perovskite Nanocrystals and LED Application

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 30, 2024

Abstract Lanthanide‐based lead‐free perovskite materials hold great promise for the development of high‐resolution full‐color displays in future. Here, various Cs 3 LnCl 6 nanocrystals (NCs) emitting light across visible to near‐infrared spectrum with remarkably high photoluminescence quantum yield (PLQY) are systemically prepared. Especially, by introducing multifunctional coumarin small molecules into EuCl NCs as an intermediate state, can achieve impressive PLQY 92.4% pure red emission and exceptional energy transfer efficiency nearly 93.2%. Furthermore, lanthanide‐based electroluminescent devices red, green, blue successfully fabricated. Among them, ‐NC‐based light‐emitting diode (LED) demonstrates a FWHM 18 nm at 617 nm, external up 5.17%, maximum brightness 2373 cd m −2 , which is most excellent reported narrowband (within 20 nm) devices. Notably, these exhibit operating half‐life 440 h level 100 surpassing performance LEDs (PLEDs). This work opens exciting possibilities future commercialization PLEDs display industry, paving way more vibrant, energy‐efficient, long‐lasting technologies.

Language: Английский

---

Bi and Sb Codoped Cs₂Ag_0.1Na_0.9InCl₆ Double Perovskite with Excitation-Wavelength-Dependent Dual-Emission for Anti-Counterfeiting Application

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(26), P. 31031 - 31037

Published: June 23, 2021

The growing demands for optical anti-counterfeiting technology require the development of new environmentally friendly materials with single component, multimodal fluorescence and high stability. Herein, Bi/Sb codoped Cs2Ag0.1Na0.9InCl6 lead-free double perovskite material is reported as an efficient luminescence excitation-wavelength-dependent emission. When excited by 360 nm UV light, dual-emission observed at 455 560 nm, which comes from 3P1–1S0 transition Sb3+ ions self-trapped excitons (STEs), respectively. Under 320 lamp, microcrystals show only a blue emission centered nm. Therefore, emits yellow lights under Moreover, obtained shows PLQY up to 41% excellent stability against both air temperature, make it promising material.

Language: Английский

---

Lead‐Free Halide Double Perovskites: Fundamentals, Challenges, and Photovoltaics Applications

Advanced Materials Technologies, Journal Year: 2022, Volume and Issue: 8(1)

Published: July 6, 2022

Abstract Metal halide perovskites (MHPs) have gained tremendous interest in photovoltaics applications reaching the power conversion efficiency (PCE) of 25.8%. Despite rapid development MHP‐based solar cells, existence toxic lead (Pb) and their operational instability are seen as key roadblocks for commercialization. A viable strategy developing lead‐free optoelectronic devices nests addressing toxicity issues these compounds by carefully strategically replacing while maintaining comparable stability PCE. In this regard, double perovskite with structural flexibility, well lower higher caught attention scientific community, surging research 2 B(I)B(III)X 6 composition. critical analysis such is presented from a fundamental point view considering orbital characteristics, bonding interaction, optical transitions relate properties cell performance. This review focuses on limiting factors critically discusses recent advancements strategies which been demonstrated to boost photovoltaic performances. Finally, starting existing materials, prospective directions identified toward enhanced device

Language: Английский

---

Unraveling the triplet excited-state dynamics of Bi3+ in vacancy-ordered double perovskite Cs2SnCl6 nanocrystals

Nano Research, Journal Year: 2022, Volume and Issue: 15(7), P. 6422 - 6429

Published: April 25, 2022

Language: Английский

---

Tunable Efficient White Emission in Holmium Doped Double Perovskites Cs₂KInCl₆ via Antimony Sensitization

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(10)

Published: March 12, 2023

Abstract Recently, ns 2 metal ions (such as Bi 3+ and Sb ) doped double perovskites have captured intense attention for their efficient emission, however, achieving tunable white light emission is always an enormous challenge. Herein, /Ho co‐doped Cs KInCl 6 are proposed, the photoluminescence results show that there two bands, one broad cyan band stems from self‐trapped exciton (STE) in [SbCl ] 3‐ octahedron, while another red derives f‐f transitions of Ho . The processes can act sensitizer to activate which due energy transfer channel STE As concentration increases, luminous color be modulated orange under 315 nm irradiation, even obtained with a quantum yield 90 ± 2% when energy‐transfer efficiency 50%. Finally, single compound white‐light emitting diodes fluorescent anti‐counterfeiting labels based on 0.5%Sb /60%Ho fabricated. This work provides effective strategy achieve lead‐free through lanthanide ion co‐doping.

Language: Английский

---

Doping/Alloying Pathways to Lead‐Free Halide Perovskites with Ultimate Photoluminescence Quantum Yields

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(3)

Published: Oct. 12, 2022

Tailored modifications of halide lead-free perovskites (LFPs) via doping/alloying with metal cations have been recognized as a promising pathway to highly efficient inorganic phosphors photoluminescence (PL) quantum yields up 100 %. Such materials typically display selective sensitivity UV light, broad PL range, and long lifetimes well unique compositional variability stability-an ideal combination for many light-harvesting applications. This Minireview presents the state-of-the-art in doped LFPs, focusing on reports published mostly last two three years. We discuss factors determining efficiency spectral parameters broadband LFPs depending dopant host matrix, both micro- nanocrystalline states, address most relevant challenges this rapidly developing research area is facing, outline concepts further progress field.

Language: Английский

---

Lanthanide Double Perovskite Nanocrystals with Emissions Covering the UV‐C to NIR Spectral Range

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(12)

Published: April 3, 2023

Abstract Lead halide perovskite nanocrystals (NCs) have recently drawn considerable attention in the fields of materials science and nanotechnology. However, a major drawback these NCs is reliance on toxic lead, which hinders widespread application. Herein, new class lead‐free NCs, that is, lanthanide double (Ln‐DP) with f‐orbital‐induced optical properties, introduced. The Pr‐, Ce‐, Tb‐, Eu‐, Sm‐, Yb‐based Ln‐DP display narrow d→f f→f emissions ranging from UV‐C to near‐infrared spectral region. Experimental data calculations reveal emissive exhibit small molecule‐like electronic absorptions: f→d atomic transitions or ligand‐to‐metal charge transfer transitions. Last, it demonstrated by alloying Ln compositions DP unique improved properties can be obtained. These are promising for sensing lighting, as components optoelectronic and/or magneto‐fluorescent devices.

Language: Английский

---

DFT aided prediction of phase stability, optoelectronic and thermoelectric properties of A2AuScX6 (A= Cs, Rb; X= Cl, Br, I) double perovskites for energy harvesting technology

Vacuum, Journal Year: 2023, Volume and Issue: 221, P. 112926 - 112926

Published: Dec. 23, 2023

Language: Английский

---

Recent developments in lead-free bismuth-based halide perovskite nanomaterials for heterogeneous photocatalysis under visible light

Nanoscale, Journal Year: 2023, Volume and Issue: 15(12), P. 5598 - 5622

Published: Jan. 1, 2023

This mini-review presents a brief overview of recent progress in bismuth-based halide perovskite (BHP) nanomaterials for heterogeneous photocatalysis under visible light, including the synthesis and physical–chemical properties advanced BHPs.

Language: Английский

---

A universal hydrochloric acid-assistant powder-to-powder strategy for quick and mass preparation of lead-free perovskite microcrystals

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: March 20, 2023

Abstract Lead-free halide perovskite materials possess low toxicity, broadband luminescence and robust stability compared with conventional lead-based perovskites, thus holding great promise for eyes-friendly white light LEDs. However, the traditionally used preparation methods a long period limited product yield have curtailed commercialization of these materials. Here we introduce universal hydrochloric acid-assistant powder-to-powder strategy which can accomplish goals thermal-, pressure-free, eco-friendliness, short time, cost high yield, simultaneously. The obtained Cs 2 Na 0.9 Ag 0.1 In 0.95 Bi 0.05 Cl 6 microcrystals exhibit bright self-trapped excitons emission quantum (98.3 ± 3.8)%, could retain (90.5 1.3)% (96.8 0.8)% after continuous heating or ultraviolet-irradiation 1000 h, respectively. phosphor converted-LED exhibited near-unity conversion efficiency from ultraviolet chip to at ~200 mA. Various ions doping (such as InCl :Ln 3+ ) other derived lead-free ZrCl 4 MnBi 12 luminous performance are all realized by our proposed strategy, has shown excellent availability towards commercialization.

Language: Английский

---