CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Muhammad Amin Padhiar,Shaolin Zhang,Fangrong Qin,Minqiang Wang,Yongqiang Ji,Noor Zamin Khan,Nisar Muhammad,Sayed Ali Khan,Jahangeer Ahmed,Shusheng Pan
Lead-free double perovskites (DPs) in the form of two-dimensional (2D) nanosheets (NSs) have emerged as exceptional candidates compared to zero-dimensional (0D) nanocrystals (NCs). This preference is attributed to their intriguing fundamental properties and promising applications in optoelectronics. Notably, NSs offer superior performance due to their enhanced surface passivation capabilities, facilitating more efficient treatment of surface defects and thereby enhancing optoelectronic properties. However, the realization of Cs 2 NaInCl 6 as lead-free DPs NSs is yet to be achieved. In this study, we successfully synthesized Cs 2 NaInCl 6 co-doped with Bi 3+ /Mn 2+ NSs. The two-step solution process synthesis enables us to achieve dimensionality control, progressing from 0D NCs to 2D NSs. Comprehensive optical spectroscopy analyses reveal that the NSs exhibit a suppressed non-radiative decay rate ( Knr ) of 5.03 × 10 −3 ns −1 in contrast to NCs with a Knr of 3.21 × 10 −2 ns −1 . This observation is indicative of a well-passivated surface in NSs. In contrast, NSs with identical composition and surface morphology significantly enhance the photoluminescence quantum yields (PLQYs) up to 73%, which represents the highest PLQYs recorded in Cs 2 NaInCl 6 DPs to the best of our knowledge. Beyond fundamental investigations, the study explores the practical applications of these NSs as anti-counterfeit marks created on a flexible substrate, demonstrating robust emission under UV light. Additionally, the fabrication and testing of a light-emitting diode (LED) showcase the versatility of these NSs in optoelectronic devices. This comprehensive exploration of the optical, morphological, and application aspects of Cs₂NaInCl₆ doped with Bi³⁺/Mn 2 ⁺ NSs contributes valuable insights to the evolving landscape of lead-free perovskite materials, highlighting their potential for diverse technological applications.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 7
·3365-3375
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IF 3.784
Jindi Wang,Shuai Huang,Yu Yan,Mengmeng Shang
In this work, using Ca 10.5 (PO 4 ) 7 as the structural model, a number of Eu 3+ -doped [Ca 9 Na 3x Y 1-x (PO 4 ) 7 (CNYP-I, 0 ≤ x ≤ 1/2) ← Ca 10.5 (PO 4 ) 7 → Ca 9+y Na 3/2-y/2 Y (1-y)/2 (PO 4 ) 7 (CNYP-II, 0 ≤ y ≤ 1)] phosphors were designed and synthesized through the heterovalent substitution of Y 3+ and Na + to Ca 2+ . The substitution mechanism, composition structure, luminescence performance, and thermal stability of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) as well as the solid solutions of CNYP-II (0 ≤ y ≤ 1), were discussed in detail. The morphology and element composition of CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) solid solutions were analyzed by SEM and EDS. The PL spectra of the specimens were containing the predominant red peak of emission at 612 nm caused via the transition of 5 D 0 - 7 F 2 , indicating that Eu 3+ occupies the low-symmetry center. Moreover, the site symmetry Eu 3+ occupied changed with the x/y value. The luminous intensity of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) phosphors at 150°C maintained about 60% of room temperature. The representative compound CNYP-I (x = 1/3) was used as the red phosphor to prepare a near-UV based white LEDs along with Ra of 80.9 and CCT of 4100 K.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Jian Li,Zhi-yong Mao,Da-jian Wang,Ying-chun Zhu,Lin Gan,Fang-fang Xu
Tunable white light of Eu 2+ doped SiAlON crystal/glass composite phosphor with blue-yellow dual-emissions was demonstrated by variation of excitation wavelength in this work. The excitation properties of blue emission originated from the transition of Eu 2+ ions in the Si–Al–B–O–N glass matrix and that of yellow emission originated from the transition of Eu 2+ ions in the SiAlON lattice were investigated, respectively. By varying the excitation wavelength in the range of 330–380 nm, white emission was tuned from cool white to warm white for this SiAlON crystal/glass composite phosphor owing to the various excitation properties of these two emission bands. Presented results indicate that this tunable SiAlON crystal/glass composite white-light phosphor might be applied in white LED, combining with UV chips with different emitting wavelengths in the range of 330–380 nm.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 28
·10292-10301
·
IF 8.067
Zixuan Wu,Xinxin Han,Juan Wang,Yayun Zhou,Ke Xing,Sheng Cao,Jialong Zhao,Bingsuo Zou,Ruosheng Zeng
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) is a prospective next-generation light source for smart and broadband NIR spectroscopy. However, the improvement of photoluminescence quantum yield and thermal quenching stability is still a crucial challenge for the pc-LED related broadband NIR phosphors. Herein, a highly efficient and thermally stable broadband NIR emitting fluoride phosphor Cs2KGaF6:Cr3+ is fabricated, which exhibits a full width at half-maximum (FWHM) of 110 nm centered at 782 nm. Notably, the phosphor exhibits an ultra-high internal quantum efficiency (IQE) of 90.2% and excellent thermal stability (I150 °C = 88.7%). The excellent anti-thermal quenching behavior is attributed to the relatively weak electron–phonon coupling effect in Cs2KGaF6:Cr3+ with a small Huang–Rhys factor of 2.17. Based on the prominent luminescent properties of the phosphor, a NIR pc-LED with a high photoelectric conversion efficiency of 22.05% is fabricated by combining the phosphor with a commercial blue LED chip. Moreover, the NIR pc-LED manifests distinguished performances in night vision security inspection, non-destructive testing, intelligent identification and biomedical imaging, indicating extensive application prospects for the as-prepared Cs2KGaF6:Cr3+ phosphor.
研究领域:
材料科学
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光学工程
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电子工程
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DOI
高影响因子
Laser & Photonics Reviews
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2025
·
IF 10
Zhiyu Yang,Guangxiang Lu,Jiani Ma,Tao Yang,Guotao Xiang,Li Li,Xianju Zhou,Zhiguo Xia
The rapid advancements in solid-state lighting have underscored the need for efficient and thermally stable phosphors for light-emitting diode (LED) applications. Herein, a red phosphor CaSc 2 O 4 :Eu 2+ ( λ ex = 450 nm, λ em = 650 nm) is synthesized employing a non-stoichiometric strategy to increase photoluminescence quantum efficiency (PLQY). Spectroscopic and crystallographic properties analysis confirm that the red emission band originates from Eu 2+ ions occupying a single Ca 2+ site with significant nephelauxetic effects and crystal field splitting. Excessive CaCO 3 additions promote the reduction of Eu 3+ and an increase of trap concentration, enhancing the PLQY from 24% to 61% and improving the emission intensities at 150 °C from 8% to 41% of that at room temperature. Versatile LED light sources, including high-quality white LED, red LED in plant growth, and the integrated pixelated intelligent LED matrices have been explored for the practical applications. This study proposes an optimized strategy to enhance the efficiency and thermal stability of Eu 2+ -doped oxide-based red phosphors for multifunctional lighting applications.
研究领域:
材料科学
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固体照明
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发光材料
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yanan Li,Shujie Gai,Hui Zhu,Jian Yin,Wenyuan Guo,Maxim S. Molokeev,Xiangyang Lu,Mao Xia,Zhi Zhou
Herein, the strategy of replacing Ge 4+ with smaller Si 4+ was adopted to realize the site-selective occupation of Bi 3+ activator in the small ring and obtain a near-infrared light-emitting in Zn 2 (Ge,Si)O 4 . The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift ( ε c ) and crystal field splitting ( ε cfs ). This work not only provides new insights for the development of Bi 3+ -activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi 3+ .
研究领域:
材料科学
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光电技术
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光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 10
·1-12
·
IF 2.8
Zhao Jiaqi,Hu Chen,Fang Jiapeng,Sun Ruyi,Lu Jingyao,Su Shikun,Lei Zonghao,Fang Pengfei,Feng He,Degao Zhong,Teng Bing
In this work, a series of iso-structural eulyite-type Ba 3 Yb(PO 4 ) 3 :Tb 3+ solid solution phosphors were synthesized via high-temperature solid-phase method. The corresponding unit cell structure, luminescence properties, thermal stability, and chromaticity coordinates of the as-obtained phosphors were systematically investigated. The crystal structure of Ba 3 Yb(PO 4 ) 3 :Tb 3+ was refined by GSAS program, which indicates the oxygen ions in Ba 3 Yb(PO 4 ) 3 are disordered at one C3 site, and the oxygen atoms are distributed at two sites. Under 378 nm ultraviolet excitation, the emission peak of Ba 3 Yb(PO 4 ) 3 :Tb 3+ appears in the range of 450–650 nm, and a characteristic green emission peak appears at 542 nm. Moreover, the luminous intensity of the Ba 3 Yb(PO 4 ) 3 :14 at.% Tb 3+ sample at 160 °C is 87.7% at room temperature, and the quantum yield is 55.8%, which reveals good thermal stability. Our results suggest that the Ba 3 Yb(PO 4 ) 3 :Tb 3+ phosphors are promising high-efficiency green light conversion materials for UV-LED applications.
研究领域:
材料科学
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光电技术
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固体化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yongfeng Liu,Qingyu Xie,Yupeng Ying,Zhaoju Gao,Xiuwen Shao,Weizhi Xia,Min Zhou,Wei Pei,Xiaosheng Tang,Yusong Tu
All-inorganic perovskite quantum dots (PeQDs) hold immense potential for use in light-emitting diodes (LEDs) due to their excellent optoelectronic properties. However, the scalable synthesis and poor stability have severely hindered their application. Here, we solved both the two issues with “one stone”, namely a bipolar ligand 3-(N,N-dimethyloctadecylammonio) propane sulfonate (ASC18). ASC18 contains a positively charged quaternary ammonium group and a negatively charged sulfonic group, which enables for long-term reaction and gram-level synthesis of PeQDs with outstanding morphology, crystallinity, and optical properties. Density functional theory calculations and experimental studies show that these merits arise from the inhibition of Ostwald ripening by ASC18 due to their simultaneous interaction with undercoordinated Br – and Pb 2+ via a bidentate binding mode. Furthermore, ASC18 capped PeQDs present significantly improved stabilities against air, UV irradiation, heat, and polar solvent. Finally, both electroluminescent LEDs and down-conversion white LEDs fabricated with our PeQDs show significant operational stability. This presents a trustworthy avenue to obtain high-quality PeQDs for their practical applications.
研究领域:
材料科学
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光电领域
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Yang,Wei Lü,Jin Xiang Lim,Biao Wang
There is strong demand of exceptional efficiency for near-infrared (NIR) phosphors for next-generation integrated and intelligent multifunctional light-emitting diode (LED) devices. Designing NIR phosphors with excellent efficiency that simultaneously meet multiple application requirements is challenging. Hence, this work focuses on the NIR optical properties and the corresponding multifunctional applications for Cr 3+ activated LaMgAl 11 O 19 (LMAO) phosphors. The blue light excitable LMAO:Cr 3+ phosphors can produce intense NIR emission ranging from 630 to 1000 nm with an 95.8% internal quantum efficiency as well as excellent thermal stability (I 423 K /I 303 K = 75.9%). Additionally, benefiting from the strong correlation between fluorescence lifetime and ambient temperature, the LMAO:Cr 3+ phosphors were showed promising potential for application in temperature sensing. Notably, the NIR phosphor-converted LED devices based on LMAO:Cr 3+ phosphors and commercial blue LED chip were self-built, which exhibiting great potential for indoor plant cultivation, night vision, and nondestructive detection. This study describes the highly efficient LMAO:Cr 3+ phosphors preparation and the corresponding multifunctional applications in the fields of optical thermometry, indoor plant cultivation, night vision, and nondestructive detection, which is crucial for the next-generation integrated and intelligent multifunctional LED devices.
研究领域:
材料科学
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光学工程
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固态照明
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温度传感技术
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植物生长技术
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无损检测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）