Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7603-7610
·
IF 6.4
Konglan Chen,Shiyu Jia,Zifan Shao,Xinxin Han,Jian Yuan,Yayun Zhou,Tingting Deng
Mn4+-activated fluoride phosphors, which exhibit narrow-band red light emission, have been extensively employed in white LED applications. However, the majority of existing research has predominantly focused on single-site emission phenomena of Mn4+ in fluoride matrices. The exploration of systems with multi-site Mn4+ luminescence is of significant importance, as it may promote the broader application of such materials. In this study, a dual-emission fluoride phosphor, BaTaF7:Mn4+ (BTF), was successfully synthesized, which exhibits two strong zero-photon line (ZPL) emissions at 627 and 630 nm. Density functional theory (DFT) calculations were employed to investigate the electronic structure and luminescence properties of the phosphor. The results suggest that Mn4+ ions tend to substitute for Ba2+ and Ta5+ in the BaTaF7 host lattice, leading to significant distortion of the Mn4+ local environment. This distortion gives rise to the dual-emission and short fluorescence lifetime of the synthesized phosphor. The white LED with BTF phosphor encapsulation shows high potential for display backlighting sources with its 113.4% NTSC color gamut achieved through RGB primary color spectral filtering. The synthesis and investigation of phosphor present a promising approach for designing and developing multi-emission Mn4+-activated fluoride phosphors with unique luminescent properties. This study provides new insights for optimizing the performance and expanding the applications of luminescent materials.
研究领域:
材料科学
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发光材料
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光电子学
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固态化学
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光子学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 11
·3969-3977
·
IF 7.393
Quan Liu,Puxian Xiong,Xiaoqi Liu,Yubin Fu,Sheng Wu,Quan Dong,Yuanyuan Li,Yan Chen,Zhijun Ma,Mingying Peng
Red luminescent phosphor SrLaGa3O7:Mn4+ was prepared by the traditional high-temperature solid-state reaction. The structural characteristics, luminescence properties and the performance of this phosphor were investigated in light-emitting diode devices. Deep red emission peaking at ∼715 nm was observed under the excitation wavelength in the range of 220–550 nm, which is related to the charge transfer band of Mn4+–O2− and the 4A2g → 4T1g, 4A2g → 2T2g and 4A2g → 4T2g transitions of Mn4+. In particular, SrLaGa3(1−x) O7:3xMn4+ exhibits the strongest absorption in the near ultraviolet region (350–410 nm). This feature can well match the emission of current commercial near-ultraviolet chips, and is expected to be used in white LEDs. Moreover, we also conducted a thermal quenching experiment on the SrLaGa3O7:Mn4+ phosphor, and the obtained activation energy was 0.4 eV, indicating that the quenching temperature is (T50%) 370 K. Finally, the application of the SrLaGa3O7:Mn4+ phosphor in constructing a LED device was explored. At a driving current of 20 mA, the Commission on Illumination (CIE) coordinates of the device are (0.3281, 0.3080), with a high color rendering index (CRI) of 91.9 and a low corresponding color temperature (CCT) of 4315 K. Experimental results show that the phosphor has broad prospects in preparing white LED devices excited by near-ultraviolet light.
研究领域:
材料科学
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光电子学
·
固态化学
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光子学
·
发光二极管（LED）
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DOI
高影响因子
CHEMISTRY LETTERS
·
2015
·Vol. 44
·期 10
·1422-1424
·
IF 1.23
Cao Renping,Luo Wenjie,Xiong Qingqiang,Jiang Shenhua,Luo Zhiyang,Fu Jingwei
Novel deep red phosphor Ba2GeO4:Mn4+ is synthesized and investigated. Emission peaking at 667 nm with excitation 290 nm is observed within the range 610–720 nm due to the 2E → 4A2 transition of Mn4+ ion. The optimal Mn4+ concentration is ca. 0.6 mol %. Luminous mechanism is explained by Tanabe–Sugano energy diagram and configurational coordinate diagram of Mn4+ ion. Ba2GeO4:Mn4+ phosphor can be used as deep red phosphor candidate for red LEDs used in indoor plant cultivation.
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DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2020
·
IF 3.233
Xiaoyong Huang,Shaoying Wang,Balaji Devakumar
Red-emitting phosphors are highly demanded as color converters for both white light-emitting diodes (LEDs) and plant growth LEDs. Herein, we reported on the discovery of novel Mn 4+ ions doped Ca 2 YTaO 6 double-perovskite red-emitting phosphors. These samples were successfully prepared via the high-temperature solid-state reaction method, and their phase purity was confirmed by powder X-ray diffraction (XRD) patterns. XRD Rietveld refinement results revealed that the title compound crystallized in monoclinic space group P 2 1 / n with lattice parameters of a = 5.59630(8) Å, b = 5.82308(8) Å, c = 8.07158(12) Å, α = γ = 90 ° , β = 89.9768(23)°, and V = 263.034(4) Å 3 . The Ca 2 YTaO 6 structure consisted of abundant [TaO 6 ] octahedrons, providing appropriate sites for Mn 4+ incorporation. As obtained by photoluminescence measurements, the Ca 2 YTaO 6 :Mn 4+ phosphors showed a broadband excitation spectrum in the 250–600 nm wavelength range with two peaks around 350 and 514 nm. Under the 350 nm excitation, they exhibited narrowband deep-red emissions in the 630–750 nm wavelength range peaking at 680 nm with full-width at half maximum (FWHM) of 36 nm, corresponding to the spin-forbidden 2 E g → 4 A 2g transition of Mn 4+ ions. The investigation of the doping concentration-dependent optical properties of Ca 2 YTaO 6 :Mn 4+ phosphors indicated the critical quenching concentration equal to 0.2 mol%. The dipole-dipole interaction between Mn 4+ activators was the major mechanism leading to the concentration quenching effect. The fluorescence decay lifetimes of Ca 2 YTaO 6 :Mn 4+ phosphors decreased from 0.34 to 0.201 ms with increasing Mn 4+ doping concentrations. The CIE chromaticity coordinates of these phosphors were calculated based on the emission spectra, and the color purity reached up to 98.3%. Besides, the internal quantum efficiency of the optimal Ca 2 YTaO 6 :0.2%Mn 4+ sample was measured to be 21%.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
发光二极管（LED）
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Guixian Li,Gan Li,Qinan Mao,Lang Pei,Hua Yu,Meijiao Liu,Liang Chu,Jiasong Zhong
Mn 4+ -activated phosphors are of great interest in luminescence lifetime thermometry due to the luxuriant luminescence properties influenced by the locally surrounding crystal field. It is highly desirable to develop effective Mn 4+ -based luminescence lifetime thermometry through modulating the structural parameters. In this work, by introducing the smaller Mg 2+ ions to replace Ca 2+ site in the BaLaCaSbO 6 matrix, a 4.2-fold enhance in the luminescence intensity, red-shifted from 690 nm to 698 nm, as well as luminescence lifetime increase from 0.212 to 0.951 ms is achieved. These modulations are mainly attributed to the strengthen pressure on the local structure, superior lattice rigidity and suppresses non-radiative transition after the substitution of smaller Mg 2+ . Interestingly, owing to the obvious thermal quenching behavior of Mn 4+ ions in the matrix, effective lifetime-based luminescence thermometry can be realized. Mg 2+ dopant results in the improvement of the absolute sensitivity from 1.22 µsK −1 (BaLaCaSbO 6 :Mn 4+ @408 K) to 4.88 µsK −1 (BaLaCa 0.1 Mg 0.9 SbO 6 :Mn 4+ @401 K).
研究领域:
材料科学
·
发光材料
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光学测温
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固态化学
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光子学
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DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Hong Ming,Yifei Zhao,Yayun Zhou,Shuai Zhang,Yuanjing Wang,Enhai Song,Zhiguo Xia,Qinyuan Zhang
Great efforts have been put in search of phosphors to fulfill the requirements for phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, a general organic–inorganic hybridization strategy was demonstrated in Mn4+-, Cr3+-, or Eu3+-doped guanidinium-based zero-dimensional hybrid fluorides to find phosphors for pc-WLEDs. Among which, GA3AlF6:Mn4+ (where GA represents the guanidinium cation [C(NH2)3]+) was selected to reveal their crystal structure, local symmetry, and luminescence properties. Density functional theory calculations suggested that GA3AlF6 with a wide band gap (∼5.24 eV) and the Fi′ interstitials are generated to balance the charge differences caused by non-equivalent doping. The GA3AlF6:Mn4+ hybrid could sustain ∼573 K high temperature without degradation and keep 90.1% of the original luminescence intensity at ∼373 K. A pc-WLED with wide color gamut (108.3%) of National Television System Committee standard was fabricated with GA3AlF6:Mn4+, suggesting its potential in high-quality backlight displays. This work not only brings a brand-new kind of organic–inorganic fluoride phosphor family but also provides great guiding significance for future exploration of fluoride-based functional materials containing a hybrid structure.
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产品关联
DOI
PHYSICS LETTERS A
·
2019
·
IF 2.087
Renping Cao,Longxiang Xu,Yaqin Ran,Xinyan Lv,Siling Guo,Hui Ao,Ting Chen,Zhiyang Luo
Ba 2 LaSbO 6 :Mn 4+ , Ba 2 LaSbO 6 :Mn 4+ , Dy 3+ , and Ba 2 LaSbO 6 :Mn 4+ , H 3 BO 3 phosphors are synthesized in the air by high temperature solid state reaction method. The particle sizes and sintering degree of Ba 2 LaSbO 6 :Mn 4+ phosphor may be changed by doping Dy 3+ ion and H 3 BO 3 . When the small amount of Dy 3+ ion and H 3 BO 3 are codoped, the emission intensity of Ba 2 LaSbO 6 :Mn 4+ phosphor can be enhanced 1.2–1.3 times and the quantum efficiency of Ba 2 LaSbO 6 :Mn 4+ phosphor can be improved. The lifetime of Ba 2 LaSbO 6 :Mn 4+ phosphor may be changed by doping Dy 3+ ion and H 3 BO 3 . The experimental results are valuable in research of luminescence property of Mn 4+ -doped luminescence materials.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Sisi Liang,Decai Huang,Jie Hu,Dejian Chen,Kunyuan Xu,Haomiao Zhu
Mn 4+ -doped oxide phosphors with emission in deep-red region are promising for the application of plant cultivation lighting. However, it remains a great challenge to synthesize these phosphors with high blue-light absorption efficiency, which is pivotal for their practical commercial applications. Herein, we conducted a local crystal field regulation strategy to notably improve the luminescent property of the Mg 14 Ge 5 O 24 :Mn 4+ phosphor. For instance, by introducing F - ions into the host, the absorption efficiency in blue-light region increased remarkably from 13% to 28%. By further substitution of Ti 4+ for Ge 4+ ions, the absorption efficiency further increased to 50%. Meanwhile, the achieved internal photoluminescence quantum yield is up to 92% for the Mg 28 Ge 5.42 Ti 2 O 38 F 10 :Mn 4+ phosphor under 422 nm blue-light excitation. Besides, the phosphor exhibits excellent photoluminecence thermal stability, i. e., the emission intensity at 423 K retained 96% of that at room temperature. By means of X-ray absorption near-edge structure and extended X-ray absorption fine structure analysis, the effect of introducing F - and Ti 4+ ions on the local coordination and valence of Mn ions in the hosts and the luminescent property of the phosphors are discussed in detail. Finally, LEDs were packaged by combining blue diode chips and Mg 28 Ge 5.42 Ti 2 O 38 F 10 :Mn 4+ phosphor, and their validity for promoting growth of plants were successfully demonstrated.
研究领域:
材料科学
·
光学
·
植物学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoyu Zhang,Langping Dong,Shaoxing Yang,Qiuyu Yao,Baiqi Shao,Jingshan Hou,Yongzheng Fang
To creating versatile light-emitting materials that enable diverse functionalities, a Mn 4+ -activated La 2 MgNbO 6.5 multifunctional phosphor that exhibits excellent comprehensive performance for applications in plant lighting and optical thermometry was synthesized. The crystal structure and luminescent characteristics were systematically analyzed. The synthesized La 2 MgNbO 6.5 :Mn 4+ shows a broadband excitation band spanning 300-500 nm and delivers far-red emission centered near 708 nm, which overlaps with the P FR phytochrome absorption of plants. Furthermore, the enhancement effect of alkali-metal ions on the performance of La 2 MgNbO 6.5 :Mn 4+ has been investigated. The optimized La 2 MgNb 0.994 O 6.5 :0.006Mn 4+ , 0.003Li + phosphor exhibits remarkable improvements in photoluminescence intensity, external quantum efficiency and thermal stability. Its external quantum efficiency reaches an impressive 50.3%, fully meeting the demands of practical applications. An LED device was fabricated by integrating the optimized La 2 MgNb 0.994 O 6.5 :0.006Mn 4+ , 0.003Li + far-red phosphor with a 410 nm chip. Wheat-seedling cultivation under its illumination demonstrated markedly enhanced stem growth, further validating the phosphor's potential as a far-red-emitting material for indoor plant-growth LED lighting. Meanwhile, the excellent temperature-dependent luminescence behavior of the phosphor also renders it promising for optical thermometry. Its nearly linear response trend enables potential practical applications, yielding a high relative sensitivity of up to 3.3656%·K −1 , and a minimum temperature uncertainty as low as 0.0165 K. The results demonstrate that the Mn 4+ -activated La 2 MgNbO 6.5 multifunctional phosphor possesses broad application prospects in both plant lighting and optical thermometry.
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Jiaqi Long,Chaoyang Ma,Yuzhen Wang,Xuanyi Yuan,Miaomiao Du,Ran Ma,Zicheng Wen,Jiantao Zhang,Yongge Cao
TiO 2−x MgO: 0.1 at% Mn 4+ (1 ≤ x ≤ 2) red phosphors are synthesized through a traditional high temperature solid-state reaction method. The excitation and emission spectra indicate that 700 nm and 660 nm red emission peaks are ascribed to Mn 4+ ions doped in MgTiO 3 and Mg 2 TiO 4 , respectively. The Ti 4+ octahedron is connected in MgTiO 3 by O 2− ions of the octahedrons, while the Ti 4+ octahedron is separated in Mg 2 TiO 4 by Mg 2+ tetrahedron and Mg 2+ octahedron. This results that the quenching concentration is higher in Mg 2 TiO 4 than in MgTiO 3 leading the less luminous centers in MgTiO 3 . Detailed spectroscopic and crystal-field studies of the Mg 2 TiO 4 : Mn 4+ and MgTiO 3 : Mn 4+ is described in the present paper.
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DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2019
·
IF 3.319
Yuwei Lan,Zihua Sun,Zuizhi Lu,Chunfeng Liang,Liya Zhou
A novel red-emitting BaLaZnTaO 6 :Mn 4+ phosphor is synthesized by a solid-state reaction. The phosphor can be excited at 350 nm, which matches well with the near-ultraviolet (UV) InGaN chip (365 nm) for white light-emitting diodes (w-LEDs). UV–visible spectral analysis indicates that doping with Mn 4+ ions results in broad absorption bands, which allow the sample to adapt to a wide range of excitation wavelength. A bright red emission peak is found in the photoluminescence spectrum and is attributed to the spin-forbidden 2 E g → 4 A 2 transition of Mn 4+ ions. All decay times are in the range of microseconds, indicating a forbidden character of intra d-shell transitions in Mn 4+ . The values of the crystal-field parameters Dq , B , and C are determined as 1980, 660, and 3138 cm −1 , respectively. The quantum efficiency of BLZT:0.0025Mn 4+ phosphor is 16.1%. The parameters of the obtained w-LEDs are CRI of 81.2 and CCT of 3803 K.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9588-9596
·
IF 5.256
T. T. Deng,E. H. Song,Y. Y. Zhou,L. Y. Wang,S. Ye,Q. Y. Zhang
A novel hydrous fluoride K2GaF5(H2O) with a special [GaF5(H2O)] group has been discovered. Interestingly, further rapidly adding K2MnF6 into the co-precipitation reaction system of K2GaF5(H2O) results in stable anhydrous cryolite phosphor K3GaF6:Mn4+. The investigation of a possible formation mechanism unravels that hydrous K2GaF5(H2O) can act as an intermediate to transform into anhydrous K3GaF6:Mn4+ induced by K2MnF6. Detailed characterizations, such as phase identification, morphology, elemental composition analysis, and IR spectra, record the time-dependent evolution process. Upon blue light excitation, phosphor K3GaF6:Mn4+ shows sharp line red emission at ∼626 nm. It presents good moisture tolerance (50% of initial luminous efficacy at 48 h), which might, due to the absence of coordinated water molecules, make the host matrix less hydrophilic. This performance, much better than those of Na3GaF6:Mn4+, K3AlF6:Mn4+, and Rb2GeF6:Mn4+, illustrates that K3GaF6 is a suitable host for Mn4+ doping. Besides, a good recovery in luminescence properties during thermal cycling (298–473 K) further demonstrates the high stability of anhydrous K3GaF6:Mn4+. By incorporating K3GaF6:Mn4+ as a red light component, a fabricated warm white light-emitting diode (WLED) presents low correlated color temperature (CCT = 3691 K), high color rendering index (Ra = 87.2 and R9 = 50.2), and a luminous efficacy of 92.1 lm W−1, and further exhibits good resistance in photoelectric properties to thermal impact with temperature ranging from 293 to 353 K, showing potential in warm WLED applications. Herein, the inductive transition from hydrous K2GaF5(H2O) to moisture-proof K3GaF6:Mn4+ is helpful for the investigation of the moisture resistance of Mn4+ activated fluorides. Moreover, these results probably propose a feasible strategy to exploit stable Mn4+-activated fluoride phosphors for warm WLED applications.
研究领域:
材料科学
·
光电子学
·
无机化学
·
固态照明
·
荧光粉化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）