Dual‐Band‐Tunable White‐Light Emission from Bi³⁺/Te⁴⁺ Emitters in Perovskite‐Derivative Cs₂SnCl₆ Microcrystals

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(9)

Published: Jan. 4, 2022

Luminescent metal halides have attracted considerable attention in next-generation solid-state lighting because of their superior optical properties and easy solution processibility. Herein, we report a new class highly efficient dual-band-tunable white-light emitters based on Bi3+ /Te4+ co-doped perovskite derivative Cs2 SnCl6 microcrystals. Owing to the strong electron-phonon coupling energy transfer from Te4+ , microcrystals exhibited broad dual-band emission originating inter-configurational 3 P0,1 →1 S0 transitions with good stability high photoluminescence (PL) quantum yield up 68.3 %. Specifically, remarkable transition -PL lifetime milliseconds at 10 K microseconds 300 was observed, as solid evidence for isolated emission. These findings provide not only insights into excited-state dynamics but also general approach achieve single-composition lead-free through ns2 -metal ion co-doping.

Language: Английский

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Efficient Near‐Infrared Luminescence in Lanthanide‐Doped Vacancy‐Ordered Double Perovskite Cs₂ZrCl₆ Phosphors via Te⁴⁺ Sensitization

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(26)

Published: April 19, 2022

All-inorganic lead-free perovskite-derivative metal halides have shown great promise in optoelectronics, however, it remains challenging to realize efficient near-infrared (NIR) luminescence these materials. Herein, we report a novel strategy based on Te4+ /Ln3+ (Ln=Er, Nd, and Yb) co-doping achieve NIR vacancy-ordered double perovskite Cs2 ZrCl6 phosphors, which are excitable by low-cost near-ultraviolet light-emitting diode (LED) chip. Through sensitization the spin-orbital allowed 1 S0 →3 P1 transition of , intense multi-wavelength originating from 4f→4f transitions Er3+ Nd3+ Yb3+ was acquired, with quantum yield 6.1 % for emission. These findings provide general approach emission through ns2 -metal lanthanide ion co-doping, thereby opening up new avenue exploring NIR-emitting derivatives towards versatile applications such as NIR-LEDs bioimaging.

Language: Английский

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Broadband Emission Origin in Metal Halide Perovskites: Are Self‐Trapped Excitons or Ions?

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(51)

Published: March 29, 2023

Abstract It has always been a goal to realize high efficiency and broadband emission in single‐component materials. The appearance of metal halide perovskites makes it possible. Their soft lattice characteristics significant electron–phonon coupling synergistically generate self‐trapped excitons (STEs), contributing with large Stokes shift. Meanwhile, their structural/compositional diversity provides suitable active sites coordination environments for doping ns 2 ions, allowing 3 P n ( =0,1,2) → 1 S 0 transitions toward emission. ions is phenomenologically similar that STE emission, hindering in‐depth understanding origin, leading failure meet the design requirements practical applications. In this scenario, herein, fundamentals development such two mechanisms are summarized establish clear comprehensive phenomenon, which may pave way an ideal customization broadband‐emission perovskites.

Language: Английский

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Efficient Multicolor and White Photoluminescence in Erbium- and Holmium-Incorporated Cs₂NaInCl₆:Sb³⁺ Double Perovskites

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(14), P. 6288 - 6295

Published: July 13, 2022

Inorganic lead-free halide perovskites with a broad-band emission of self-trapped excitons (STEs) have attracted great attention in lighting applications. However, it remains fundamental challenge to expand the display color gamut because is difficult individually tune emitting proportion at different wavelengths. Herein, we employ doping route incorporate Sb3+, Er3+, and Ho3+ ions into Cs2NaInCl6, which enables multicolor emissions narrow full width half-maxima high photoluminescence quantum yields (PLQYs). The blue (445 nm) originates from STEs [SbCl6]3– octahedrons, while narrowband green (550 red (655 are mainly derived Er3+ ions, respectively. An efficient energy transfer between multiple luminescent centers key point achieve such an tunable emission. By controlling lanthanide level, can be systematically modulated, cold 10401 K (0.278, 0.286) warm 4608 (0.347, 0.298) adjustable white-light (PLQY ∼70%) achieved successfully. results provide inspiration for material design light-emitting properties optoelectronic

Language: Английский

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Recent Advances and Opportunities of Eco‐Friendly Ternary Copper Halides: A New Superstar in Optoelectronic Applications

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(44)

Published: Feb. 28, 2023

Abstract Recently, the newly‐emerging lead‐free metal‐halide materials with less toxicity and superior optoelectronic properties have received wide attention as safer potentially more robust alternatives to lead‐based perovskite counterparts. Among them, ternary copper halides (TCHs) become a vital group due their unique features, including abundant structural diversity, ease of synthesis, unprecedented properties, high abundance, low cost. Although recent efforts in this field made certain progresses, some scientific technological issues still remain unresolved. Herein, comprehensive up‐to‐date overview progress on fundamental characteristics TCH versatile applications is presented, which contains topics such as: i) crystal electronic structure features synthesis strategies; ii) mechanisms self‐trapped excitons, luminescence regulation, environmental stability; iii) burgeoning devices phosphor‐converted white light‐emitting diodes (WLEDs), electroluminescent LEDs, anti‐counterfeiting, X‐ray scintillators, photodetectors, sensors, memristors. Finally, current challenges together future perspectives development are also critically described, considered be critical for accelerating commercialization these rapidly evolving technologies.

Language: Английский

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Strong Self‐Trapped Exciton Emission and Highly Efficient Near‐Infrared luminescence in Sb³⁺‐Yb³⁺ Co‐doped Cs₂AgInCl₆ Double Perovskite

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(13)

Published: Feb. 7, 2023

Abstract Yb 3+ doped lead‐free double perovskites (DPs) with near‐infrared (NIR)‐emitting have attracted extensive attention due to their wide application prospects. Unfortunately, they still suffer from weak NIR emission undesirable resonance energy transfer between the sensitizers and ions. Herein, a new effective NIR‐emitting DP is developed by co‐doping Sb into Cs 2 AgInCl 6 . Experiments theoretical calculations reveal that induced ions, self‐trapped excitation (STE) intensity of greatly enhanced 240 times, STE shifts 600 nm 660 nm, which contributes larger spectral overlap absorption As result, absolute photoluminescence quantum yield reaches an unprecedented 50% in DPs via high‐efficiency sensitization (>30%). The excellent optical performance : Sb, high ambient, thermal light stability makes it suitable for night‐vision devices. Moreover, ingenious dual‐modal information encryption based on combination visible fluorescence printing patterns utilizing respectively successfully demonstrated. This study provides inspiration designing highly efficient Ln ‐doped illustrates great potential versatile optoelectronic applications.

Language: Английский

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Broad Dual Emission by Codoping Cr³⁺(d→d) and Bi³⁺(s→p) in Cs₂Ag_0.6Na_0.4InCl₆Double Perovskite

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(33)

Published: June 28, 2023

A phosphor emitting both white light and broad near-infrared (NIR) radiation can simultaneously provide visual inspection early signs of rotting food products. The NIR emission is absorbed by the vibrational overtones water molecules present in items, providing non-invasive image contrast to assess freshness. Here we design a phosphor, namely, Cr3+ -Bi3+ -codoped Cs2 Ag0.6 Na0.4 InCl6 , that emit warm (1000 nm) with quantum yield 27 %. This dual emitter designed combining features s2 -electron (Bi3+ ) d3 (Cr3+ doping weak crystal field halide perovskite host. 6s2→6s16p1${6{s}^{2}\to 6{s}^{1}6{p}^{1}}$ excitation Bi3+ using commercial 370 nm ultraviolet light-emitting-diodes (UV-LED), yields emissions. fraction excited dopants light, other transfers its energy non-radiatively . Then de-excites emission. Temperature dependent (6.4-300 K) photoluminescence combination Tanabe-Sugano diagram show experiences ( Dq/B${{D}_{q}/B}$ =2.2), yielding 4T2→4A2${{{\rm \ }}^{4}{{\rm T}}_{2}\to {{\rm A}}_{2}}$ As proof concept, fabricated panel containing 122 phosphor-converted LEDs, demonstrating capability inspect

Language: Английский

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Near‐Infrared Light Emitting Metal Halides: Materials, Mechanisms, and Applications

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

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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

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Lanthanide Doping into All-Inorganic Heterometallic Halide Layered Double Perovskite Nanocrystals for Multimodal Visible and Near-Infrared Emission

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(5), P. 3200 - 3209

Published: Jan. 26, 2024

The introduction of lanthanide ions (Ln3+) into all-inorganic lead-free halide perovskites has captured significant attention in optoelectronic applications. However, doping Ln3+ heterometallic layered double perovskite (LDP) nanocrystals (NCs) and their associated mechanisms remain unexplored. Herein, we report the first colloidal synthesis (Yb3+, Er3+)-doped LDP NCs utilizing a modified hot-injection method. resulting exhibit efficient near-infrared (NIR) photoluminescence both NIR-I NIR-II regions, achieved through energy transfer down-conversion mechanisms. Density functional theory calculations reveal that dopants preferentially occupy Sb3+ cation positions, disruption local site symmetry lattices. By leveraging sensitizations intermediate levels, delved series Ln3+-doped Cs4M(II)Sb2Cl12 (M(II): Cd2+ or Mn2+) via co-doping strategies. Remarkably, observe brightening effect predark states Er3+ dopant Er3+-doped owing to Mn component acting as an bridge. This study not only advances our understanding doped but also propels for wider range

Language: Английский

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