MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Renping Cao,Jinlong Zhang,Wudi Wang,Zuofu Hu,Ting Chen,Yuanxiu Ye,Xiaoguang Yu
Li 2 Mg 3 SnO 6 :Mn 4+ deep red phosphor is synthesized by high-temperature solid-state reaction method in air. With excitation 330 and 480 nm, the emission band peaking at ∼670 nm within the range 600–790 nm is observed owing to the 2 E → 4 A 2 transition of Mn 4+ ion. Excitation bands peaking at ∼330, 395, and 480 nm in the range of 220–600 nm indicate that Li 2 Mg 3 SnO 6 :Mn 4+ phosphor can be effectively excited by (near) ultraviolet and blue light-emitting diode chips. The optimal Mn 4+ ion concentration is ∼0.4 mol%. Fluorescence lifetime and quantum efficiency of Li 2 Mg 3 SnO 6 :0.4%Mn 4+ phosphor with excitation 330 nm are ∼266.67 μs and 36.3%, respectively. The luminous mechanism is explained by the Tanabe-Sugano energy level diagram of Mn 4+ in the octahedron.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Renping Cao,Yanshu Zhao,Zuofu Hu,Wenhua Shao,Fen Xiao,Guotai Zheng,Pan Liu,Ting Chen
In this work, we successfully synthesize La(Mg 1-x Nb x )O 3 :Mn 4+ ( x = 0.296 and 0.384) deep-red emitting phosphors by using high-temperature solid state method in air and investigate their crystal structures, morphologies, and luminescence properties. A broad excitation spectral band of La(Mg 1-x Nb x )O 3 :Mn 4+ phosphors monitored at 705 nm can be observed in the region from 220 nm to 580 nm. La(Mg 1-x Nb x )O 3 :Mn 4+ phosphors show a deep-red emission in the range of 640–760 nm with a peak at ~705 nm due to 2 E → 4 A 2 transition of Mn 4+ ions and the corresponding chromaticity coordinates are (0.7316, 0.22684). The concentration dependent emission spectra indicate that their optimal Mn 4+ doping concentration is ~0.6 mol%. Their lifetime values decrease with increasing the Mn 4+ doping concentration from 0.2 mol% to 1.0 mol%. The experimental results are helpful for the research on luminescence property of Mn 4+ ions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Haonan Yu,Jingming Chan,Balaji Devakumar,Xiaoyong Huang
High-efficiency far-red emitting phosphors with an emission peak of around 730 nm are urgently needed for indoor plant growth light-emitting diode (LED) lighting. In this article, we report on the synthesis, crystal structure, and luminescence properties of a new highly efficient Mn 4+ ion-activated Li 3 La 3 W 2 O 12 (LLWO) far-red emitting phosphor. A group of LLWO:Mn 4+ phosphors doped with different Mn 4+ ion concentrations have been prepared via the conventional high-temperature solid-state reaction route. X-ray diffraction Rietveld refinement reveals that the LLWO:Mn 4+ phosphor has the monoclinic structure with space group P2 1 /n , along with lattice parameters of a = 5.5396 Å, b = 5.6026 Å, c = 7.8802 Å, α = γ = 90°, β = 90.0988°, and V = 244.57 Å 3 . Interestingly, LLWO:Mn 4+ phosphors can generate bright narrowband far-red emission in the 650–800 nm wavelength range peaking at 719 nm due to the spin- and parity-forbidden 2 E g → 4 A 2g transition of Mn 4+ ions, matching well with the absorption spectrum of phytochrome P FR . The excitation spectrum monitored at 719 nm has a broad excitation band with the range from 250 to 550 nm centered at 339 nm and 472 nm, indicating that LLWO:Mn 4+ phosphors could be efficiently pumped by both ultraviolet and blue LED chips. The highest far-red emission is achieved for the sample doped with 1.2 mol% Mn 4+ ion, and this optimal LLWO:1.2%Mn 4+ sample shows a high internal quantum efficiency of 88.4% and a decay lifetime of 2.289 ms. Commission Internationale de l’Eclairage (CIE) color coordinates of LLWO:1.2%Mn 4+ are determined to be (0.7326, 0.2674). Besides, the crystal field analysis and temperature-dependent emission spectra of the as-prepared samples have been investigated in detail. The emission intensity of LLWO:1.2%Mn 4+ sample at 423 K remains about 40% of that at 303 K. Finally, a LED device is fabricated by integrating the LLWO:1.2%Mn 4+ phosphors and a 460 nm blue LED chip, which shows bright blue and far-red dual emission bands under 20–300 mA driving currents. This work demonstrates that these newly developed far-red emitting LLWO:Mn 4+ phosphors have excellent application prospects in plant growth LED lighting.
研究领域:
材料科学
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园艺学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 13
·2480-2487
·
IF 5.066
E. H. Song,J. Q. Wang,S. Ye,X. F. Jiang,M. Y. Peng,Q. Y. Zhang
A novel red fluoroaluminate phosphor, cryolite Na3AlF6:Mn4+, has been designed and synthesized via a facile two-step method at room temperature. Under blue light excitation, it exhibits intense sharp line red fluorescence (∼630 nm) with high color purity. The crystal structure, morphology and doping concentration of the samples were characterized in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM) and ICP-AES. The influence of synthesis conditions, raw materials and doping concentration on crystal structure and photoluminescence (or decay behavior) has been investigated carefully. The optimal composition, Na3AlF6:1.58%Mn4+, shows a bright red light and excellent thermal stability (∼99.93% of the emission intensity at 200 °C relative to 23 °C) upon ∼467 nm blue light excitation. A warm high-power white LED with a high color rendering index (Ra = 92.7 and R9 = 94) and low color temperature (CCT = 3903 K) was fabricated based on the blue InGaN chip, commercial yellow phosphor YAG:Ce3+ and red phosphor Na3AlF6:Mn4+.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 11
·2910-2918
·
IF 5.256
T. T. Deng,E. H. Song,J. Sun,L. Y. Wang,Y. Deng,S. Ye,J. Wang,Q. Y. Zhang
Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature. Single crystal X-ray diffraction analysis reveals that the fluoride Na3GaF6 crystallizes in the P2(1)/n space group with a = 5.4760 Å, b = 5.6862 Å, c = 7.9009 Å, β = 90.309°, and z = 2. Upon blue or UV light excitation, the obtained phosphor Na3GaF6:Mn4+ emits intense and pure red fluorescence. The effects of raw materials, doping concentration and environmental temperature on its luminescence properties and crystal structure have been investigated and discussed in detail. Such a newly synthesized red phosphor shows excellent anti-thermal quenching behavior (∼118.8% of emission intensity at 150 °C relative to 25 °C) and good color stability upon blue light (∼467 nm) excitation. By using the Na3GaF6:Mn4+ phosphor as a red light component, a high-power stable warm white light-emitting diode (WLED, Ra = 81, CCT = 2966 K, luminous efficacy = 56.73 lm W−1) was fabricated, further evidencing the potential of the as-synthesized Na3GaF6:Mn4+ phosphor for white LED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Renping Cao,Weijun Zhang,Ting Chen,Yunfei Zheng,Hui Ao,Zhiyang Luo,Shikun Xie,Huijun Wan
Ba 2 La 2 ZnW 2 O 12 :xMn 4+ (BLZWO:xMn 4+ ) (0 ≤ x ≤ 1.2 mol%) are prepared via the solid state reaction method under air conditions. The crystal phases and optical properties of all samples are investigated. The yellow emission of BLZWO is observed with the chromaticity coordinates (0.3940, 0.4389), and its emission spectrum covers the region from 380 to 810 nm owing to the W 6+ - O 2− transition. When the excitation wavelength is 344 nm, BLZWO:xMn 4+ show an adjustable photo-luminescence characteristic by altering the Mn 4+ concentration owing to the energy transfer from [WO 6 ] group to Mn 4+ ions. With excitation at 514 nm, BLZWO:xMn 4+ only show red emission. The excitation spectrum of BLZWO:Mn 4+ with peaks at 344 and 514 nm is in the region from 210 to 600 nm and its emission spectrum with peak at 704 nm are observed in the range of 625–800 nm. The lifetimes of BLZWO:xMn 4+ reduce successively with adding Mn 4+ concentration. The results are good for the basic research on luminescence characteristics of Mn 4+ ion.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Renping Cao,Jinlong Zhang,Wudi Wang,Ting Chen,Qingdong Gou,Yufeng Wen,Fen Xiao,Zhiyang Luo
Novel deep red-emitting Ca 3 Al 4 ZnO 10 :Mn 4+ (CAZO:Mn 4+ ) phosphor is synthesized by high-temperature solid-state reaction method in air. The crystal structures and optical characterizations of the phosphors are described. X-ray diffraction patterns indicate that all samples are a pure phase. CAZO:Mn 4+ phosphor with excitation 330 and 465 nm exhibits strong deep red emission in the range of 650–790 nm. CAZO:Mn 4+ phosphor can be efficiently excited by near-ultraviolet and blue light from 300 to 500 nm. The optimal Mn 4+ ion concentration in CAZO:Mn 4+ phosphor is ∼0.6 mol%. Lifetimes of CAZO:xMn 4+ (0.3 ≤ x ≤ 1.8 mol%) phosphors decrease from 1.95 to 1.56 ms with increasing Mn 4+ ion concentration in the range of 0.3–1.8 mol%. The paper content is help to develop other Mn 4+ ion doped luminescence materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Renping Cao,Xinyu Cheng,Lei Su,Ting Chen,Siling Guo,Guotai Zheng,Hui Ao,Wensheng Li
Mg 2 La 2 SnO 7 :Mn 4+ phosphor is synthesized by the solid-state reaction method in air. Monitored at 706 nm, excitation spectrum of Mg 2 La 2 SnO 7 :Mn 4+ phosphor including peaks at ∼ 300, 333, 395, and 516 nm can be observed in the range of 220–600 nm. With excitation at 333 nm, emission band of Mg 2 La 2 SnO 7 :Mn 4+ phosphor is shown in the range of 640–780 nm owing to the 2 E → 4 A 2 transitions of Mn 4+ ion. The optimal Mn 4+ ion concentration is ∼ 0.3 mol% in Mg 2 La 2 SnO 7 :Mn 4+ phosphor. The lifetime decreases from 1.23 to 0.83 ms with the increase of Mn 4+ concentration from 0.1 to 1.2 mol%. There is only one luminescence center (Mn 4+ ) in Mg 2 La 2 SnO 7 :Mn 4+ phosphor, which is confirmed by the luminescence properties, decay curves, and time-resolved emission spectra. Mg 2 La 2 SnO 7 :Mn 4+ phosphor has good thermal stability. Luminous mechanism is explained by energy level diagram of Mn 4+ ion and the thermal quenching phenomenon is analyzed by the configuration coordinate diagram of Mn 4+ ion.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2014
·
IF 2.075
Renping Cao,Fenxiang Zhang,Chunyan Cao,Xiaoguang Yu,Aihui Liang,Siling Guo,Hongdong Xue
CaAl 2 − y O 4 : y Mn 4+ ( y = 0–1.6 mol%) phosphors are synthesized by a solid-state reaction method in air, and their crystal structure and luminescence property are investigated. To compare luminescence property, CaAl 3.99 O 7 :1%Mn 4+ and SrAl 1.99 O 4 :1%Mn 4+ phosphors are also synthesized at the same condition. Broad band excitation spectra are observed within the range 220–550 nm, and emission spectra cover from 600 to 720 nm with the strongest emission peak at ∼658 nm owing to the 2 E → 4 A 2 transition of Mn 4+ ion. The influence of crystal field to luminous intensity is discussed, and the possible luminous mechanism of Mn 4+ ion is explained by using energy level diagram of Mn 4+ ion. CaAl 1.99 O 4 :1%Mn 4+ , CaAl 3.99 O 7 :1%Mn 4+ , and SrAl 1.99 O 4 :1%Mn 4+ phosphors under excitation 325 nm light emit red light, and their CIE chromaticity coordinates are (0.7181, 0.2813), (0.7182, 0.2818), and (0.7198, 0.2801), respectively. These contents in the paper are helpful to develop novel and high-efficient Mn 4+ -doped phosphor for white LEDs.
研究领域:
材料科学
·
光学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wanguo Liu,Fuyu Chen,Xiaogen Zhan,Peichang Ouyang
The developments of science and technology have made greenhouse plant cultivation increasingly valued, which has made the research on light sources of great significance, causing that deep-red-emitting phosphors have particular research prospects. In this work, Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under high-temperature solid-state method is synthesized in air and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film is prepared. Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ at room temperature shows deep-red emission in the range of 600 – 800 nm with photoluminescence (PL) peaks at ∼660 and 672 nm because of the 2 E g → 4 A 2g transition of Mn 4+ ion in octahedron [MnO 6 ] when it is excited by light from ultraviolet to green (250–540 nm). PL spectra of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under different excitation wavelength and the time-resolved PL spectra at room temperature are investigated, which confirm one luminous center (Mn 4+ ). The good thermos-stability is proved by the temperature-dependent PL spectra. The potential applications of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ in plant growth lighting and polymer luminescent film are explored via absorption spectra of plants, PL spectrum of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ , and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film.
研究领域:
材料科学
·
光学
·
植物生物学
·
固体物理
·
高分子科学
✓ 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）