NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 11
·5330-5337
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IF 3.3
Yu Wang,Rao Chen,Dongmei Liu,Chaofei Peng,Junwei Wang,Xiaoqing Dong
The development of effective Vis-sensitive photoinitiators for light-emitting diode (LED) polymerization is still an emerging challenge as LEDs are being developed into the predominant light sources. In this work, a series of new functionalized photoinitiators, containing thioxanthones and oxime-esters as functional groups, was designed and straightforwardly synthesized in two steps. The structures of the photoinitiators were studied using 1H NMR, 13C NMR, and high-resolution mass spectrometry. The conclusion of the photophysical properties indicated that the long wavelength absorptions from 360 nm to 405 nm made the investigated thioxanthone derivatives quite appealing as a valuable photoinitiator under UV-Vis LEDs. The structure–reactivity relationship was also studied in detail through real-time FTIR spectroscopy. A possible photolysis mechanism was expected based on further photolysis and online 1H NMR activities. With a proper molecular design, the new functionalized photoinitiators were synthesised straightforwardly and they displayed more advanced initiation abilities than their parent thioxanthone.
研究领域:
材料化学
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光化学
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有机合成
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
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IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Jian Hu,Ruirui Cui,Jun Zhang,Hupeng Ling,Youzhen Shi,Xiang Guo
The work focuses on the utilization of the conventional solid-state sintering procedure to synthesize white phosphors Ca 2 InTaO 6 : x Dy 3+ (0.02 ≤ x ≤ 0.12). Utilizing X-ray diffraction, the phase structure of samples was examined, and the crystal structure was refined using the Rietveld method. A scanning electron microscope was used to analyze the microstructure of sample. First-principles calculations confirm that the indirect bandgap of Ca 2 InTaO 6 is 3.786 eV. The luminous properties and energy transfer mechanism of Ca 2 InTaO 6 : x Dy 3+ were studied using photoluminescence spectroscopy. The 4 F 9/2 → 6 H 13/2 transition of Dy 3+ ions is responsible for the greatest emission peak, which was measured at 575 nm. According to research, the lifespan falls as the concentration of Dy 3+ doping amount rises because of frequent interaction and energy transfer between Dy 3+ ions. The correlated color temperature of the W-LEDs packaged with Ca 2 InTaO 6 :0.08Dy 3+ is 4677 K and CIE 1931 chromaticity coordinates are (0.3578, 0.3831). Meantime, the phosphor also shows outstanding temperature stability property, which maintains 83.8% of its initial emission intensity at 450 K (activation energy of 0.1467 eV). The W-LEDs retain their performance for 100 min when powered at 3.4 V voltage and 600 mA current, demonstrating the packed W-LEDs' sustained operation at high temperatures.
研究领域:
材料科学
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光学
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高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 14
·6377-6385
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IF 3.5
Chengping Fang,Shuoheng Wang,Shuai Wei,Qingxian Xu,Zeyu Lyu,Sida Shen,Taixing Tan,Hongpeng You
NIR luminescent materials have garnered widespread attention because of their exceptional properties, with high tissue penetration, low absorption and high signal-to-noise ratio in the field of optical imaging. However, producing nanophosphors with high quantum yields of emitting infrared light with wavelengths above 1000 nm remains a significant challenge. Here, we prepared a nanoscale ZnGa2O4:xCr3+,yNi2+ phosphor with good luminescence performance in near-infrared emission, which was synthesized via a hydrothermal method and subsequent calcination process. By co-doping with Cr3+ and Ni2+, the ZnGa2O4 phosphor shows a strong broadband emission of 1100–1600 nm in the second near-infrared (NIR-II) region, owing to the energy transfer from Cr3+ to Ni2+ with an efficiency up to 90%. Meanwhile, a near-infrared phosphor-conversion LED (NIR pc-LED) device is fabricated based on the ZnGa2O4:0.8%Cr3+,0.4%Ni2+ nanophosphor, which has under 100 mA input current, an output power of 23.99 mW, and a photoelectric conversion efficiency of 7.53%, and can be effectively applied in imaging and non-destructive testing. Additionally, the intensity ratio of INi/ICr of ZnGa2O4:0.8% Cr3+,0.4%Ni2+ with its high sensitivity value of 4.21% K−1 at 453 K under 410 nm excitation, indicates its potential for thermometry application.
研究领域:
材料科学
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光学工程
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生物医学工程
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高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 47
·23612-23619
·
IF 5.1
Wenqiang Li,Qihao Li,Yuehua Chen,Cailing Liu,Wenjing Zhong,Xiang Zhang,Yayun Zhou,Tingting Deng,Jiantao Lü,Ting Fan
Near-infrared phosphor-converted light-emitting diodes (pc-LEDs), as the core light source for smart broadband near-infrared spectroscopy, face critical challenges in balancing luminous efficiency and thermal stability. Herein, we report a Cr3+-doped fluoride phosphor AlF3:Cr3+ with efficient broadband near-infrared (NIR) emission. Under blue-light excitation, AlF3:Cr3+ exhibits a broadband NIR emission centered at 749 nm with a full width at half maximum (FWHM) of 87 nm. Notably, it shows excellent thermal stability, retaining 86.28% of its room-temperature luminescence intensity at 423 K (150 °C). This superior anti-thermal quenching property is attributed to the weak electron–phonon coupling in its crystal structure, characterized by a low Huang–Rhys factor (S = 2.15). By integrating this phosphor with a blue LED chip, we fabricated a NIR pc-LED device with a photoelectric conversion efficiency of 2.2%@20 mA. The device would demonstrate significant advantages in diverse fields, including nondestructive testing, biomedical imaging, and intelligent security, highlighting the great potential of AlF3:Cr3+ for industrial applications.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Hui Li,Ziyao Wang
Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ phosphors were developed through the conventional solid-state reaction. Luminescent performance including the energy transfer from dysprosium to europium , spectral tunability, fluorescent lifetime and thermal quenching behavior of the as-studied phosphors was studied. The characteristic emission of Dy 3+ and Eu 3+ were detected in Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ upon the excitation at various ultraviolet–visible wavelengths. The critical distance between dysprosium and europium ions was evaluated to be about 16.05 Å. The energy transfer from dysprosium to europium in Ba 3 Lu 4 O 9 can be attributed to the dipole-quadruple mechanism, and the efficiency was evaluated to be 81.8% for Ba 3 Lu 3.52 O 9 :0.16Dy 3+ ,0.32Eu 3+ . The tunable warm-white emission and high thermal stability reveal that the as-studied phosphor can be an auspicious alternative for white LEDs application.
研究领域:
材料科学
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光学
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高影响因子
Nanoscale
·
2024
·
IF 5.8
Jiaxin Sun,Wenjie Xu,Yixiang Liu,Bin Sun,Jie Xiong,Yongfu Lian,Yanhui Lou,Lai Feng
Carbon dots (CDs) have attracted significant research interest due to their great potential in optoelectronic applications. Although various CDs have been synthesized via the “bottom-up” pathway, few studies have focused on understanding the origins of the structural and optical diversities of CDs. In this study, two benzenoid acids with a slight structural variation (i.e., 9-oxo-9H-fluorene-2,7-dicarboxylic acid (FR) and 4,4′-biphenyl dicarboxylic acid (BP)) are employed as precursors, yielding orange- and red-emissive CDs with quantum yields of 43.1% and 30.9%, respectively. A combined experimental and theoretical study reveals that the structural and optical diversities of the CDs originate from the structural variation of their precursors. Furthermore, we demonstrate that the light-emitting diodes (LEDs) based on the blended emissive layer of poly(N-vinyl carbazole) (PVK) and the synthesized CDs display cyan and yellow lights, respectively, with moderate turn-on voltages of 4.0 and 4.5 V and maximum luminance values of 454 and 276 cd m−2. Such different optoelectronic performances could be attributed to the different energy-level alignments of CDs-FR and CDs-BP, relative to that of PVK. This study thus provides a typical example to understand the precursor-dependent diversities of CDs, which may contribute to the rational screening of precursors towards CDs with desirable optical/optoelectronic properties.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Rongbo Ma,Tingting Zhang,Bin Cao,Xinyong Gong,Chaoyong Deng,Weichao Huang
The structural, optical and temperature-dependent luminescence properties of Y2Mg2Al2Si2O12:Cr3+ phosphors are investigated for their multifunctional applications. The as-prepared phosphors exhibited an intense far-red emission band around 600-850 nm with a peak at 687 nm, which matches well with the absorption band of plant phytochromes. Importantly, the optimized sample showed excellent thermal stability and the emission intensity at 423 K maintained about 77% of that at 298 K. The potential application of the phosphor in plant growth LED devices was also demonstrated. Furthermore, due to the unique thermal quenching behavior of Cr3+, a three-mode luminescent thermometry was designed based on the fluorescent intensity (FL), fluorescent intensity ratio (FIR), and full width at half maximum (FWHM) method. The maximum temperature relative sensitivity (Sr) of each mode can reach 2.74% K−1, 1.09% K−1, 1.47% K−1, respectively. These results indicate that the Y2Mg2Al2Si2O12:Cr3+ phosphors can address applications in plant growth and optical thermometry.
研究领域:
材料科学
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植物学
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光学工程
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DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Xinjing Xie,Yangyang Tuo,Siyu Cheng,Di Gao,Mengkun Zhang,Xiang Liu,Huajuan Deng,Ruijin Yu
The novel Dy 3+ -doped NaMgLaTeO 6 (NaMgLaTeO 6 :Dy 3+ ) phosphors were produced through a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement manifest that the pure phosphor was committed to the space group (P2 1/m (11)) and features the double perovskite structure. The band gap ( E g ) of the direct semiconductor NaMgLaTeO 6 is calculated to be 2.065 eV. Under 388 nm excitation, the 4 F 9/2 → 6 H 13/2 energy level transition contributes to the maximum emission peak at 572 nm. Other properties of the phosphor include optimal concentration ( x = 5 mol %), high thermal stability, activation energy ( E a = 0.31 eV), and internal quantum efficiency (IQE = 31.44 %). The relevant color coordinate of the white light emitting diode (w-LED) prepared by the phosphor is (0.298, 0.311). The features of the latent fingerprint (LFP) created by NaMgLaTeO 6 :Dy 3+ can be clearly reflected on different surfaces. In summary, NaMgLaTeO 6 :Dy 3+ phosphor has proven high potential in w-LEDs production and LFP detection.
研究领域:
材料科学
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光学
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高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Siyuan Chen,Wangqi Mao,Yaohua Jiang,Yang Liu,Jingzhou Li,Chi Zhang,Hao He,Hongxing Dong,Long Zhang
Due to their excellent properties, lead halide perovskites are promising candidates for future optical emitters. However, lead (Pb) toxicity in perovskite materials poses a critical concern for their commercial application in optoelectronic devices. Herein, we present a facile and environmentally friendly approach for synthesizing lead-free [MnBr4]BrCs3 perovskite materials. Our approach involves using a water-based evaporation crystallization technique to prepare [MnBr4]BrCs3 with an anti-perovskite structure. The anti-perovskite structure of the powder was confirmed through X-ray diffraction analysis. The prepared fluorescent powder exhibited strong green emission with a peak emission wavelength of 524 nm and an extremely narrow bandwidth (∼41 nm). Variable-temperature steady-state luminescence spectroscopy was used to investigate the temperature-dependent photophysical properties of [MnBr4]BrCs3, which reveal notable thermal stability and anti-thermal quenching behavior, making them potential candidates for light-emitting diodes (LEDs). The temperature-dependent emission behavior was further investigated using temperature-dependent XRD, lifetime analysis, magnetic measurements, and first-principles calculations, suggesting that lattice expansion and Mn-related interactions may influence the excited-state dynamics and reduce energy-migration-related quenching losses. As proof, a phosphor-converted UV LED based on the material was successfully prepared, exhibiting a high maximum brightness (257 445 cd m−2) and a long half-life (870 min). These findings have significant implications for developing efficient and environmentally friendly perovskite-based opto-electronics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Haohan Hu,Yi Zhu,Siyu Qin,Wenguang Dai,Yuan Tong,Zheng Chen,Yulong Zhao,Xiuquan Gu
Metal halide perovskite quantum dots (PQDs) are promising for optoelectronic applications, yet CsPbI 3 PQDs face challenges from intrinsic defects, poor stability, and limited processability. Herein, we report a dual-ligand synergistic passivation strategy (DLSPS) combining La(acac) 3 and benzamide, coupled with EPDM encapsulation. The strategy employs La(acac) 3 for lattice defect compensation and La 3 + fills Pb 2+ vacancies while benzamide for surface passivation, synergistically suppressing non-radiative recombination and ion migration. EPDM encapsulation forms a hydrophobic network, enhancing processability and environmental robustness. Density functional theory (DFT) calculations confirm strong and selective binding of ligands to CsPbI 3 , which achieve a high PLQY of 70.11%, narrow emission at 688 nm, and exceptional stability under thermal, aqueous, and UV stresses. Red LEDs fabricated with CsPbI 3 (DLSPS)/EPDM films deliver deep-red emission (CIE: 0.73, 0.27) and retain 70% of initial intensity after 72 h operation. This scalable strategy bridges material engineering with device fabrication, advancing industrialization of perovskite-based red LEDs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Quanle Cheng,Ruoshan Lei,Huanping Wang,Xingjie Song,Denghao Li,Shilong Zhao
Cyan-emitting LEDs are critical for advanced solid-state lighting, yet conventional phosphor-converted devices face thermal and encapsulant issues. All-solid-state transparent ceramics are promising alternatives, but cyan-emitting ones remain largely unexplored. Herein, novel cyan-emitting Bi 3+ :Y 2 O 3 transparent ceramics were prepared via vacuum sintering. The samples exhibit a dense microstructure, high visible transmittance, strong UVC/UVB shielding, and excellent mechanical properties. Bi 3+ occupies C 2 and S 6 lattice sites, producing dominant cyan (495 nm, C 2 ) and weak violet (423 nm, S 6 ) emissions under 332 nm excitation. The two emissions show distinct thermal responses due to thermally activated energy transfer from C 2 to S 6 , and the sample retains 75% of its intensity at 373 K with stable cyan color. The ceramic-based LED exhibits bright cyan emission, eliminating the aging issues of phosphor-converted devices. This work demonstrates the potential of Bi 3+ : Y 2 O 3 transparent ceramics for cyan-emitting LEDs in low-light and medical applications, as well as UV-shielding windows.
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