Journal of Materials Chemistry C
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2024
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IF 5.7
Yongrun Dong,Wen Li,Tao Huang,Shuaigang Ge,Linghang Kong,Chuang Ning,Zequan Li,Wei Gao,Bingsuo Zou
Recently, lead-free double perovskites have been regarded as a promising alternative to lead halide perovskites due to their wide emission band, and environmental protection and stability properties, and are expected to become a series of rising star materials in the lighting field. However, currently, the growth of most lead-free double perovskites occurs in the strong acid environment, which not only brings high cost and environment risk, but also makes it hard to realize large-scale applications with powder products. Herein, we apply a strategy of in situ synthesis of lead-free double perovskites in a polymer matrix by using a small amount of precursors and relatively friendly DMSO solvent to obtain efficiently luminescent Sb3+/Mn2+ co-doped Cs2KInCl6/PVDF composite films in a large-area. The co-doping of Mn2+/Sb3+ into this inorganic double perovskite matrix makes microcrystals with good crystallinity and size distribution in this polymer. The as prepared co-doping composite film with Mn/Sb feeding ratio 16 : 1 shows the brightest white light emission under 320 nm excitation, with a photoluminescence quantum yield (PLQY) as high as 86.98%. The energy transfer (E-T) from the charge-transfer band to the triplet self-trapped exciton (STE) around Sb3+ and then to the ferromagnetic (FM) coupled Mn2+ pair 3d state was confirmed by the temperature-dependent PL spectra and density functional theory calculations. Finally, a single-compound white light emitting diode with chromatic coordinates of (0.31, 0.33) and fluorescent anti-counterfeiting labels could be fabricated based on this composite film with the best white emission. This work provides a new strategy for the application of lead-free double perovskites in the fields of lighting and anti-counterfeiting.
研究领域:
材料科学
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光电技术
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光子学
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纳米技术
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照明技术
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防伪技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 12
·16749-16757
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IF 5.1
Yihan Liu,Yingjie Mao,Zhichao Zhang,Kai Liu,Denghui Xu,Jun Zhou
Lead-free double perovskites (DPs), characterized by their low toxicity, broad emission spectra and excellent stability, have emerged as highly promising doped hosts with significant potential for visible light applications. However, achieving rich and distinctive multiple photoluminescent (PL) emission through doping with various lanthanide (Ln 3+ ) ions remains a formidable challenge. In this work, we explored the luminescent properties of Cs 2 KInCl 6 , which exhibits intrinsic broad self-trapped excitons (STEs) emission centered at 500 nm. By doping Ln 3+ ions (Dy 3+ , Sm 3+ , and Tb 3+ ) into Cs 2 KInCl 6 , multiple emission could be realized, along with energy transfer (ET) from the intrinsic STEs to Tb 3+ and Sm 3+ ions. Notably, the incorporation of Tb 3+ ions enhanced exciton-phonon coupling and lattice vibrations , resulting in strengthened STEs emission. Furthermore, tunable emission from green to yellow was achieved through multiple ET processes in Cs 2 KInCl 6 :Tb 3+ ,Sm 3+ by co-doping Tb 3+ and Sm 3+ . This work not only offers new insights into enhancing STEs emission in DPs, but also imparts Cs 2 KInCl 6 with tunable PL properties, which makes it a promising candidate for multicolor light-emitting devices.
研究领域:
材料科学
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光物理学
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无机化学
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发光材料
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半导体材料
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高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Min Zhang,Jianming An,Yue Li,Edwin Yue Bun Pun,Hai Lin
Novel Eu 3+ -doped Cs 2 KInCl 6 double perovskite exhibits ultrabroadband emission, enabling efficient multicolor luminescence covering the entire visible spectrum with a single luminescent center. This behavior originates from the intrinsically low phonon energy of the host, which effectively suppresses multi-phonon relaxation (MPR) and consequently reshapes the radiative pathways of Eu 3+ . As a result, its stepwise population accumulation occurs along the excited-state energy ladder, promoting multiple radiative transitions. Based on this kinetic behavior, the rare coexistence of blue ( 5 D 3 → 7 F 4 ), green ( 5 D 2 → 7 F 3 ), yellow ( 5 D 1 → 7 F 2 ), and red ( 5 D 0 → 7 F 2 ) emissions are achieved with large emission cross-sections of 2.00 × 10 −22 , 4.75 × 10 −22 , 5.48 × 10 −22 , and 8.18 × 10 −22 cm 2 , respectively. These emissions are further validated by high fluorescence branching ratios exceeding 40%, confirming the efficiency of the corresponding radiative channels and their collective contribution to multipeak full-spectrum emission. In addition, the phosphors demonstrate pronounced thermal responsiveness in the temperature range of 303 – 433 K, together with dynamically tunable emission, supporting their applications in high-sensitivity optical thermometry, dynamic anti-counterfeiting, and high-quality lighting. Overall, this work suggests that ultralow-phonon-energy perovskite provides an effective platform for achieving multiple excited-state radiative transitions, thus offering a research foundation for developing functional optical materials and next-generation photonic devices.
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 13
·期 6
·2402556
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IF 8
Yihan Liu,Zhichao Zhang,Yingjie Mao,Kai Liu,Denghui Xu,Dan Liu,Xiong Li,Jun Zhou
Doping lanthanide ions in double perovskites (DPs) offers a promising approach to tailor optical and optoelectronic properties for versatile applications. However, achieving efficient and thermal stable DPs remains a significant challenge. In this paper, a series of Cs 2 KInCl 6 :Yb 3+ ,Er 3+ DPs with a negative thermal quenching behavior and high sensitivity are fabricated. The intrinsic luminescence properties of Cs 2 KInCl 6 are studied with a broad intrinsic self-trapped excitons (STEs) emission peak at 500 nm, which can be enhanced by doping Er 3+ ions accompanied with greater distortion of the [InCl 6 ] 3− octahedrons as well as multiple characteristic emission modes of Er 3+ under ultraviolet and near-infrared excitation. Notably, the addition of sensitizer Yb 3+ ions leads to the enhanced up-conversion emission of Er 3+ (up-conversion quantum yield up to 1.66%), anti-thermal quenching performance brought by the phonon-assisted energy transfer up-conversion process, as well as high sensitivity and reproducibility based on fluorescence intensity ratio technology. This work provides an effective strategy to enhance the STEs emission of DPs and achieve efficient optical temperature sensors through lanthanide ions doping.
研究领域:
材料科学
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光学
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物理学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Maohao Yang,Wanyin Ge,Yao Guo,Jianxin Li,Yongxiang Li
With the continuous advancement of counterfeiting technologies, traditional static anti-counterfeiting systems have exhibited inherent security vulnerabilities, urgently necessitating the development of novel intelligent anti-counterfeiting materials with multi-stimulus responsive mechanisms. This study developed a solvent evaporation crystallization method to successfully synthesize a novel lead-free halide double perovskite (LHDPs) Cs 2 KInCl 6 : Sb 3+ , which exhibits multi-color intelligent luminescence. By precisely controlling humidity and temperature, Cs 2 KInCl 6 : Sb 3+ can undergo reversible luminescence transitions from "green → yellow (Cs 2 InCl 5 (H 2 O): Sb 3+ ) → green". The unique stimulus-responsive behavior originates from the material's high sensitivity to water molecule adsorption/desorption, making it applicable for information encryption systems. Density functional theory calculations reveal that Sb 3+ -doped introduces intermediate energy levels, reducing the bandgaps of Cs 2 InCl 5 (H 2 O), Cs 3 In 2 Cl 9 , and Cs 2 KInCl 6 , which enhances their light absorption and emission properties. Moreover, LHDPs Cs 2 KInCl 6 : Sb 3+ maintain 93 % of their initial luminescence intensity at high temperatures (403 K), demonstrating excellent thermal stability. This study elucidates the luminescence regulation mechanism of Sb 3+ -doped LHDPs and establishes a dynamic color switching model ("structural phase transition-optical response"), providing theoretical support for design next-generation smart anti-counterfeiting materials and developing of high-temperature stable luminescent devices.
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DOI
高影响因子
危险品化学品经营许可证（带存储）