LUMINESCENCE
·
2023
·Vol. 38
·期 2
·208-215
·
IF 2.9
Hui Wang,Lingling Wang,Meihua Wu,Minghao Fang,Zhaohui Huang,Xin Min
This paper reports a sequence of a Ca 3 YAl 3 B 4 O 15 :xEu 3+ red phosphor prepared using a high-temperature solid-state reaction. At the excitation of 396 nm, the samples emitted intense red emission centred at ~623 nm, which could be attributed to the 5 D 0 → 7 F 2 transition of the Eu 3+ ion. The results showed that the optimum Eu 3+ doping concentration of Ca 3 YAl 3 B 4 O 15 :Eu 3+ phosphor was x = 80 mol%, and the concentration quenching mechanism of Ca 3 YAl 3 B 4 O 15 :Eu 3+ red phosphor belonged to the exchange coupling between Eu 3+ ions. The Commission Internationale de l'éclairage (CIE) coordinates and colour purity of Ca 3 Y 0.2 Al 3 B 4 O 15 :0.8Eu 3+ were calculated as (0.6375, 0.3476) and 95.5%, respectively. Moreover, the red emission of the obtained phosphor Ca 3 YAl 3 B 4 O 15 :0.8Eu 3+ exhibited a low thermal quenching behaviour with an intensity retention rate of 92.85% at 150°C. The above results manifest that the Eu 3+ -activated Ca 3 YAl 3 B 4 O 15 phosphor is predicted to be a promising red luminescent component for white light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaolei Zhu,Xiaoping Wang,Xianke Sun
Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors were prepared to investigate their luminescence characteristics. The SrZnSO:Bi 3+ , SrZnSO:Mn 2+ and SrZnSO:Tb 3+ phosphors, excited by the NUV/blue light, show blue, orange and green emissions, respectively. The Bi 3+ → Tb 3+ , Tb 3+ → Mn 2+ and Bi 3+ → Mn 2+ energy transfer processes take place in Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ -, Bi 3+ /Mn 2+ - and Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, which result in tunable luminescence of these phosphors. The CIE coordinates were calculated on the basis of the emission spectra, and they reflect the emission color changes of phosphors. For the Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ - and Bi 3+ /Mn 2+ - activated SrZnSO phosphors, the emission points are located in the cyan, yellow and white light regions, respectively. For the Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, the light is in warm white light region.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Dehai Liang,Zhe Sun,Shirong Lu,Jinrong Zhao,Yong Zhou,Kang An,Zhigang Zang
Lead-free metal halides (LMHs) have recently attracted numerous attention in solid-state lighting due to their unique structures and outstanding optoelectronic properties. However, conventional preparation processes with the utilization of toxic organic solvents and high temperatures seem to impede commercial applications of LMHs. In this work, we successfully synthesize Cu+-based metal halides (TMA)3Cu2Br5–xClx (TMA: tetramethylammonium) with high photoluminescence quantum yields (PLQYs) via a solvent-free mechanical grinding method. By changing the ratio of halide ions (Cl– and Br–) in precursors, the emission wavelength of the prepared (TMA)3Cu2Br5–xClx can be tuned from 535 to 587 nm, which are employed as emitters in the fabrication of white-light-emitting diodes (WLEDs). The achieved WLEDs exhibit a high color rendering index value of 84 and standard Commission Internationale de l’Éclairage (CIE) coordinates of (0.324, 0.333). This feasible and solvent-free preparation strategy not only promotes the mass production of LMHs but also highlights the promising potential for efficient solid-state illumination.
研究领域:
材料科学
·
光电
·
固态照明
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2022
·
IF 6.888
Mengyan Cao,Xiujian Zhao,Xiao Gong
In this work, we report large-scale preparation of stable Sb3+ and Bi3+ codoped Cs2ZrCl6 microcrystals for highly efficient white light emission using ionic liquids, demonstrating a broad dual-band white emission covering 400–800 nm. The dual emissions originate from the associated self-trapped excitons of the [SbCl6]3– and [BiCl6]3– octahedra. Moreover, the ratio of the dual-emission peaks can be effectively regulated by tuning the excitation wavelength. Meanwhile, to improve the optical properties and stability, ionic liquids are employed to assist the synthesis process of perovskite materials. The white light emission of one of the samples demonstrates CIE coordinates right in the center of the white light region (0.334, 0.331) and an excellent color rendering index (∼90.3), accompanied by a 66.1% quantum efficiency. Moreover, our method allows the facile synthesis of large batches of microcrystalline powders. Our findings demonstrate the potential of white phosphors as single components for future applications in lighting fields.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 10
·期 1
·88-97
·
IF 2.889
Wang Zixin,Lin Hui,Zhang Dawei,Shen Yiming,Li Yang,Hong Ruijin,Tao Chunxian,Han Zhaoxia,Chen Lei,Zhou Shengming
In this study, deep-red emitting Mg 2 TiO 4 :Mn 4+ phosphor ceramics were synthesized by the high temperature solid-state reaction method. The ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum (FWMH) value of 31 nm. The peak wavelength was located at 658 nm, which matched the demanded wavelength for photosynthesis. The crystal field strength ( D q ) and the Racah parameters ( B and C ) were estimated by the Tanabe-Sugano diagram. The thermal conductivity of the Mg 2 Ti( 0.999 )O 4 :0.001Mn 4+ ceramic was 7.535 W/(m·K) at room temperature, which was one order of magnitude higher than that of the traditional packaging method using the silicone gel. A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic increasing. These results indicated that the Mg 2 TiO 4 :Mn 4+ phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.
研究领域:
材料科学
·
光电技术
·
农业工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Yuechen Zhai,Ding Zhou,Pengtao Jing,Di Li,Haibo Zeng,Songnan Qu
Luminescent carbon nanodots (CDots) have attracted much attention, but their luminescence is usually quenched in solid state. Efficient green or yellow emissive CDot-based phosphors are scarce. In this work, green emissive CDot@NaCl composite phosphors were fabricated through a convenient, low cost and eco-friendly way by embedding green emissive CDots (g-CDot) in NaCl crystals. With the protection of NaCl host, the g-CDot@NaCl composite phosphors exhibit good photostability, significant resistance to organic solvents , and improved photoluminescence quantum yields up to 25%. White light-emitting diodes with tunable color temperatures (3944–5478 K) and CIE coordinates have been realized based on the g-CDot@NaCl composite phosphors.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光子学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junyu He,Tongqing Sun,Min Li,Anshi Chu,Xiujuan Zhuang
The realization of stable single-component white light emission in metal halide perovskites is still challenging due to the fast halide ion migration and narrow luminescence bands. In this work, all-inorganic single CsPbCl x Br 3−x perovskite microplates with stable red-blue-green triple color light emission are prepared by introducing europium ions Eu 3+ as dopants. Eu doping effectively suppresses ion migration and enables two spatially separated halide phases with stable dual-wavelength emissions. Furthermore, the incorporation of Eu 3+ compensates for the absence of red-light emission, thereby yielding a superior white emission with exceptional quality. The color rendering index of triple-color-emitting perovskites can be tuned successfully by controlling the halogen ratios, and the optimal microplate achieved a Commissions Internationale de l’Eclairage (CIE) coordinates of (0.32, 0.32). The results present a new enlightenment for the preparation of low-cost single-component white light materials.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Yue Lu,Yong Yang,Li Guan,Dawei Wang,Jinxin Zhao,Jingfa Yang,Zhiren Wei,Fenghe Wang,Zhiping Yang,Xu Li
ZnS coating with oleic acid nano-particles have been successfully synthesized through the oil-phase thermal injection method. As-prepared samples are characterized by powder X-ray diffraction, transmission electron microscopy and spectra analysis. The emission color of ZnS NPs changes from blue to cyan with different ratio of Zn/S. ZnS: x Eu 3+ NPs with different doping concentrations of Eu 3+ ions have different emission intensities and CIE coordination. The emission peaks vary with the change of y value of ZnSe y S 1- y NPs, and the chromaticity coordinate transit from green to yellow region. The emission color and mechanism of the luminescent properties of ZnS, ZnS: x Eu 3+ and ZnSe y S 1- y NPs are studied in detail. The results indicate that the thermal mixture injection without toxic is an effective and green method for synthesizing metal sulphitde, and the energy level structure, particle size, photoluminescence of ZnS can be achieved by forming different defect or doping of Eu or Se ions .
研究领域:
纳米技术
·
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiaolin Zhu,Zhangcheng Pan,Tianyue Xu,Xiuwen Shao,Zhaoju Gao,Qingyu Xie,Yupeng Ying,Wei Pei,Hao Lin,Jia Wang,Xiaosheng Tang,Weiwei Chen,Yongfeng Liu
All-inorganic perovskite quantum dots (PeQDs) have sparked extensive research focus on white-light-emitting diodes (WLEDs), but stability and photoluminescence efficiency issues are still remain obstacles impeding their practical application. Here, we reported a facile one-step method to synthesize CsPbBr3 PeQDs at room temperature using branched didodecyldimethylammonium fluoride (DDAF) and short-chain-length octanoic acid as capping ligands. The obtained CsPbBr3 PeQDs have a near-unity photoluminescence quantum yield of 97% due to the effective passivation of DDAF. More importantly, they exhibit much improved stability against air, heat, and polar solvents, maintaining >70% of initial PL intensity. Making use of these excellent optoelectronic properties, WLEDs based on CsPbBr3 PeQDs, CsPbBr1.2I1.8 PeQDs, and blue LEDs were fabricated, which show a color gamut of 122.7% of the National Television System Committee standard, a luminous efficacy of 17.1 lm/W, with a color temperature of 5890 K, and CIE coordinates of (0.32, 0.35). These results indicate that the CsPbBr3 PeQDs have great practical potential in wide-color-gamut displays.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Ruonan Yao,Jiawei Lin,Kunjie Liu,Yuanchang Xu,Boyi Xiao,Jing Zhao,Zhongnan Guo,Quanlin Liu,Wenxia Yuan
Low-dimensional tin-based halide perovskites are considered as eco-friendly substitutions of the iconic lead-based perovskites to host the potential as optoelectronic materials. However, a fundamental understanding of the structure–property relationship of these Sn(II)-based hybrids is still inadequate due to the limited members of this material family. To our knowledge, there is still lack of reports on a series of Sn(II)-based halide perovskites with the same organic cation but covering chloride, bromide, and iodide. In this work, three new halide perovskites TMPDASnX4 (X = Cl, Br, I) (TMPDA = N,N,N′,N′-tetramethyl-1,4-phenylenediamine) are successfully synthesized, which provide the ideal paradigm to study the halogen-dependent evolution of the structure and properties of Sn(II)-based hybrid perovskites. Despite sharing the same monoclinic lattice (P21/m space group), it is demonstrated that TMPDASnCl4 adopts a one-dimensional structure composed of a five-coordinated pyramid configuration due to an extremely long Sn···Cl distance, while the typical two-dimensional motif is still maintained in TMPDASnBr4 and TMPDASnI4. The ambient stability is declined in the order from chloride to bromide and then to iodide. TMPDASnCl4 exhibits a broad-band bluish-white-light emission (centered at 515 nm, full width at half-maximum (fwhm) = 193 nm) with the Commission Internationale de l′ Elairage (CIE) coordinates as (0.29, 0.34). Further, the correlated color temperature and color-rendering index were determined as 7617 K and 80.5, respectively. Based on the synthesis of new crystals, our work sheds light on the composition–structure–property relationship of hybrid Sn(II)-based halide perovskites.
研究领域:
材料科学
·
光电
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Yanyan Li,Juan Zhang,Caiyuan Guo,Tingting Zhang,Yuehua Liang,Jiuzhi Wei,Yun Yan,Xinxian Ma
A carbazole-based Schiff-base small molecule ( FG ) was developed, with its molecular structure characterized by 1 H NMR, 13 C NMR, HRMS-ESI, IR spectroscopy and DFT calculations to confirm the presence of key functional groups and spatial configuration. This compound exhibited remarkable fluorescence enhancement upon coordination with Zn 2+ , and the FG–Zn²⁺ complex efficiently transferred energy to four fluorophores—Rhodamine 6 G ( RH6G ), Eosin Y, Acridine Red, and Nile red. Notably, white-light emission was achieved at a 60:1 molar ratio of FG–Zn²⁺ to RH6G , with CIE coordinates (0.30, 0.34), close to the standard white-light point (0.33, 0.33). Additionally, FG can be mixed with polyvinyl alcohol ( PVA ) to form a writable gel that reveals hidden patterns under UV light, showing promise for information encryption and secure data storage.
研究领域:
材料化学
·
光学材料
·
传感器与生物传感器
·
超分子化学
·
荧光光谱学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yandong Ren,Shuchen Lü
Copper(I) halides have recently attracted increasing attention in a variety of photonics applications, owing to their highly luminescent efficiency, nontoxicity, and low-dimensional electronic structure. Moreover, combining compositional engineering and mass production of new materials may further enrich the research and application of functional materials. Herein, we controllably synthesized two series of novel mixed-halide Cs 3 Cu 2 Cl 5-x I x and Cs 5 Cu 3 Cl 8-x I x powders via the compositional engineering for the first time. The crystal structures are identified with Rietveld refinement and density functional theory calculations. The mixed-halide compound exhibits relatively wide full width of half-maximum (~70 nm), adjustable bandgap (from 449 nm to 486 nm), larger Stokes shifts (~200 nm), and dramatic improved stability with high efficiency (photoluminescence quantum yield at least 90.61%), which present a scalable strategy for mass production for practical applications. In addition, the controllable phase transformation from blue-emitting Cs 3 Cu 2 I 5 to yellow-emitting CsCu 2 I 3 was confirmed. Most notably, the white light is obtained by combining novel Cs 3 Cu 2 Cl 5-x I x /Cs 5 Cu 3 Cl 8-x I x with yellow-emitting CsCu 2 I 3 powders. Based on this, we firstly introduce the blue-emitting Cs 5 Cu 3 Cl 7 I powders in white LED fabrication by combining ultraviolet chip and as-prepared yellow-emitting CsCu 2 I 3 powders, to generate high-quality and stability white light with CIE coordinates of (0.335, 0.398) and colour rendering index value of 77.8. For comparison, red-emitting CaAlSiN 3 :Eu 2+ phosphors are also introduced for LED package to substitute CsCu 2 I 3 powders, which exhibit the high colour rendering index of 89.2. This work not only develops new mixed-halide compounds with high stability and performance, but also provides the unique strategy for promoting industrialization process of LED backlights.
研究领域:
材料科学
·
光子学
·
光电
·
化学
·
工程
✓ 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）