Synergistic Integration of Halide Perovskite and Rare‐Earth Ions toward Photonics

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

Published: Feb. 13, 2025

Abstract Halide perovskites (HPs), emerging as a noteworthy class of semiconductors, hold great promise for an array optoelectronic applications, including anti‐counterfeiting, light‐emitting diodes (LEDs), solar cells (SCs), and photodetectors, primarily due to their large absorption cross section, high fluorescence efficiency, tunable emission spectrum within the visible region, tolerance lattice defects, well adaptability solution‐based fabrication processes. Unlike luminescent HPs with band‐edge emission, trivalent rare‐earth (RE) ions typically emit low‐energy light through intra‐4f optical transitions, characterized by narrow spectra long lifetimes. When fused, cooperative interactions between REs endow resulting binary composites not only properties inherited from parent materials but also introduce new attributes unattainable either component alone. This review begins fundamental characteristics REs, followed particular focus on impact electronic structures associated energy transfer The advanced synthesis methods utilized prepare HPs, RE‐doped compounds, are overviewed. Furthermore, potential applications summarized across diverse domains, high‐fidelity anticounterfeiting, bioimaging, LEDs, photovoltaics, photodetection, photocatalysis, conclude remaining challenges future research prospects.

Language: Английский

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Near‐Complete Suppression of NIR‐II Luminescence Quenching in Halide Double Perovskites for Surface Functionalization Through Facet Engineering

Advanced Science, Journal Year: 2024, Volume and Issue: 11(32)

Published: June 26, 2024

Abstract Lanthanide‐based NIR‐II‐emitting materials (1000–1700 nm) show promise for optoelectronic devices, phototherapy, and bioimaging. However, one major bottleneck to prevent their widespread use lies in low quantum efficiencies, which are significantly constrained by various quenching effects. Here, a highly oriented (222) facet is achieved via engineering Cs 2 NaErCl 6 double perovskites, enabling near‐complete suppression of NIR‐II luminescence quenching. The optimally (222)‐oriented Ag 0.10 Na 0.90 ErCl microcrystals emit Er 3+ 1540 nm light with unprecedented high efficiencies 90 ± 6% under 379 UV excitation (ultralarge Stokes shift >1000 nm), record near‐unity yield 98.6% also obtained (222)‐based NaYb 0.40 0.60 Cl microcrystallites 980 excitation. With combined experimental theoretical studies, the underlying mechanism facet‐dependent emissions revealed, can contribute surface asymmetry‐induced breakdown parity‐forbidden transition undesired non‐radiative processes. Further, role reexamined molecular dynamics based on two facets, highlighting drastic two‐phonon coupling effect hydroxyl group 4 I 13/2 level . Surface‐functionalized facets will provide new insights tunable open up avenue developing efficient emitters toward broad applications.

Language: Английский

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Tailoring Self‐Trapped Exciton Emission in 0D Indium‐Based Perovskites by Solvent‐Induced Crystal Structure Engineering

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract 0D indium‐based all‐inorganic metal halide perovskites offer great potential for multifunctional applications but face the challenges of poor structural adjustability and an incomplete dynamic picture self‐trapped exciton (STE) emissions. Here, a novel Cs 4 InCl 7 single crystal is developed as solvation bridge phase transformations to either 2 5 ·H O via water or into 3 6 by methanol. The diversified structures not only enrich emission colors also difference in coordination number symmetry + , laying foundations comprehending influence A‐site on STE Steady‐state transient spectroscopy together with density functional theory simulations, reveal that low geometry charge octahedron facilitate excited state distortions, leading strong second‐order Jahn‐Teller (SOJT) effect large Stokes shift Multicolor tuning Sb 3+ ‐doped under solvent heat stimuli enables extended optical anti‐counterfeiting, temperature sensing, sensors. work offers improved understanding SOJT manipulation atomic engineering lead‐free sheds light their broad practical applications.

Language: Английский

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Surface Vibration‐Mediated and Multiphonon Relaxation‐Assisted Antithermal‐Quenching Shortwave Infrared Emission in Ho‐Based Double Perovskite With Long Lifetime

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Thermal quenching generally predominates in Er 3+ 1540 nm luminescence at elevated temperatures, due to intensified lattice vibration and efficient overtone vibrational relaxation by O─H stretch. This issue impedes practical device applications of shortwave infrared Er‐doped phosphors. Herein, with the mediation surface phonons, anti‐thermal emission is reported (220)‐dominated ‐doped Cs 2 NaHoCl 6 double perovskite. The downshifting emissions can be boosted rising temperatures from 303 543 K, reaching 225%@483 K initial intensity accompanied a long lifetime 33.02 ms 483 K. By combining temperature‐dependent situ Raman Fourier transform spectroscopies excited‐state dynamics results, coordination role water molecules verified, serving as promoters instead quenchers on (220) facet high temperatures. Furthermore, energy transfer Ho enables intense photoluminescence quantum yield 78.1% under 450 excitation. Finally, compact thermally stable phosphor‐converted light‐emitting diode (LED) designed narrowband light source blue LED chip. work pushes improved understanding achieving thermal‐enhanced for potential broad applications.

Language: Английский

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