1
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Zhu Y, Sun G, Wang Y, Sun Y, Xing X, Shang M. Multiwavelength Excitation in Ho 3+-Doped All-Inorganic Double Perovskites Achieved by Codoping Mn 2+ for Warm-White LEDs and Plant Growth. Inorg Chem 2024; 63:4438-4446. [PMID: 38377556 DOI: 10.1021/acs.inorgchem.4c00224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho3+-doped Cs2NaBiCl6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn2+, apart from the characteristic emissions from Ho3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn2+ and a sharp emission peak at 657 nm from Ho3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs2NaBiCl6 to Mn2+ and then from Mn2+ to Ho3+. The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn2+ overcomes the low absorption efficiency caused by f-f forbidden transitions of Ho3+. Finally, the diverse luminescent performance within the Cs2NaBiCl6:Ho3+, Mn2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.
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Affiliation(s)
- Yiying Zhu
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
| | - Guoxun Sun
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
| | - Yining Wang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
| | - Yixin Sun
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
| | - Xiaole Xing
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
| | - Mengmeng Shang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, P. R. China
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2
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Zhou J, Wen T, Wang Y, Cong R, Yang T. Ce 3+-Doped Li 2Ca 5Gd(BO 3) 5 Phosphors with Multiple Luminescent Centers and High Pressure Sensitivity under Near UV Excitation. Inorg Chem 2023; 62:21138-21146. [PMID: 38039185 DOI: 10.1021/acs.inorgchem.3c03046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2023]
Abstract
The performance of Ce3+-based phosphors under mechanical high pressures becomes attractive due to the potential application as a visual pressure sensor. Li2Ca5Gd(BO3)5 was selected as the host for the Ce3+ doping. Rietveld refinements reveal that rare earth cations occupy M1, M2, and M3 sites, and indeed, the photoluminescent spectra of Li2Ca5Gd1-xCex(BO3)5 (0.005 ≤ x ≤ 0.15) exhibit the characteristic of multiple activators, defined as CeI, CeII, and CeIII, with the maximal emission wavelength at ∼444, 419, and 378 nm, respectively. The optimal internal and external quantum efficiencies are 86.29% for x = 0.005 and 20.26% for x = 0.10, respectively, under the NUV excitation at 363 nm. In-situ high pressure emission spectra under 375 nm excitation exhibit an overall red-shift, and the linear pressure susceptibilities up to 6.7 GPa for CeI and CeII centers are -390 and -279 cm-1/GPa, respectively, which is probably the largest among Ce3+-doped oxides and oxysalts. Due to the above superiorities, Ce3+-doped LCGB possesses a high potential as a visual pressure sensor, and this is a successful study on the structure-property relationship of inorganic materials.
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Affiliation(s)
- Jinru Zhou
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, People's Republic of China
| | - Ting Wen
- Center for High Pressure Science and Technology Advanced Research, Beijing 100193, People's Republic of China
| | - Yonggang Wang
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Rihong Cong
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, People's Republic of China
| | - Tao Yang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, People's Republic of China
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3
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Tian J, Xie J, Zhuang W. Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2179. [PMID: 36984060 PMCID: PMC10052287 DOI: 10.3390/ma16062179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/25/2023] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
The development of novel phosphor materials with excellent performance and modification of their photoluminescence to meet the higher requirements for applications are the essential research subjects for luminescent materials. Multi-site luminescent materials with crystallographic sites for the activator ions that broaden the tunable range of luminescent spectra and even enhance the luminescent performance have attracted significant attention in the pursuit of high-quality luminescence for white light-emitting diodes. Here, we summarize multi-site luminescence characteristics based on the different kinds of host and activator ions, introduce the identifications of multi-site activator ions via optical analysis, provide a structural analysis and theoretical calculation methods, and introduce the regulation strategies and advance applications of multi-site phosphors. The review reveals the relationship between crystal structure and luminescent properties and discusses future opportunities for multi-site phosphors. This will provide guidance for the design and development of luminescent materials or other materials science.
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Affiliation(s)
- Junhang Tian
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory for Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
| | - Jihuan Xie
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory for Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
| | - Weidong Zhuang
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory for Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
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4
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Zhang X, Zhang L, Hou C, Kang J, Li Y, Sun B, Li Y, Chen H. Highly efficient Ce: Lu(Mg,Al) 2(Si,Al) 3O 12 phosphor ceramics for high-power white LEDs/LDs. OPTICS EXPRESS 2022; 30:25078-25092. [PMID: 36237046 DOI: 10.1364/oe.463022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 06/16/2022] [Indexed: 06/16/2023]
Abstract
Lu3Al5O12: Ce3+ (LuAG: Ce3+) phosphor ceramics (PCs) with high quantum efficiency and excellent thermal stability are incredibly promising color converters for high-power white light emitting diodes (LEDs)/ laser diodes (LDs) lighting. However, the greenish emission of LuAG:Ce3+ PCs does not allow to reach white light emission upon pumping by a blue LED/ LD without an additional red luminescent material. In this work, a series of (Ce0.003Lu0.997)3(MgxAl1-2xSix)5O12 (LCMASG) (x = 0-0.15) PCs were fabricated by solid state reaction method. Impressively, the as-prepared PCs exhibited a distinct red-shift (513→538nm) and a 17% increase of the color index (CRI) of high-power white LED(58.4→70.4). Particularly, Ce: Lu(Mg, Al)2(Si, Al)3O12 PC with 15 at.% substitution concentration showed only 8% luminescent intensity loss at 150 °C and high internal quantum efficiency (IQE) of 82%, exhibiting desirable optical thermal stability. By combining with a 460 nm blue chip or a 455 nm laser source, white LED/LD devices based on the LCMASG PCs in a remote excitation mode were constructed. The optimized luminous efficiency of Ce: Lu(Mg, Al)2(Si, Al)3O12 PC with 15 at.% Mg2+/Si4+ doping up to 176.4 lm/W was obtained as the power density of the blue laser increased to 6.52 W/mm2. Also, a 4053K CCT of the warm white light emission was realized. Therefore, this work proves that the LCMASG PCs are promising to serve as color converters for high power LEDs/LDs lighting in the future.
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5
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Elevating photoluminescence properties of Y3MgAl3SiO12:Ce3+ transparent ceramics for high-power white lighting. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.04.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Lin Q, Gao T, Liu Y, Liu R, Chen S, Ma X, Zhao C. Design of luminescence in (Sr,Gd)Li(Al,Mg)3N4:Eu2+ deep red phosphor via crystal field engineering for full-spectrum WLEDs. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Zhang H, Zhong J, Du F, Chen L, Zhang X, Mu Z, Zhao W. Efficient and Thermally Stable Broad-Band Near-Infrared Emission in a KAlP 2O 7:Cr 3+ Phosphor for Nondestructive Examination. ACS APPLIED MATERIALS & INTERFACES 2022; 14:11663-11671. [PMID: 35195983 DOI: 10.1021/acsami.2c00200] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band NIR phosphors remains a significant challenge. In this work, a phosphate, KAlP2O7, with a wide band gap and suitable electronic environment for Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits a broad-band emission covering 650-1100 nm with a peak centered at 790 nm and a full width at half-maximum (fwhm) of 120 nm under 450 nm excitation. The internal quantum efficiency (IQE) was determined to be 78.9%, and the emission intensity at 423 K still maintains 77% of that at room temperature, implying the high efficiency and excellent thermal stability of this material. Finally, a NIR phosphor-converted light-emitting diode (pc-LED) device was fabricated by using the as-prepared material combined with a 450 nm blue LED chip, which presents a high NIR output power of 32.1 mW and excellent photoelectric conversion efficiency of 11.4% under a drive current of 100 mA. Thus, this work not only provides an inexpensive broad-band NIR material with high performance for applications in NIR pc-LEDs but also highlights some strategies to explore this class of materials.
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Affiliation(s)
- Hongshi Zhang
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jiyou Zhong
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Fu Du
- School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
| | - Lei Chen
- Tsinghua University Graduate School at Shenzhen, Shenzhen 518101, China
| | - Xiaoli Zhang
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Zhongfei Mu
- Experimental Teaching Department, Guangdong University of Technology, Guangzhou 510006, China
| | - Weiren Zhao
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
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8
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Meng Q, Zhao G, Zhu Q, Sun X, Li JG. Remarkable structure and luminescence regulation of a Gd 2LuAl 5O 12:Ce garnet phosphor with a Ca 2+/Si 4+ pair for high-quality w-WLED lighting. Dalton Trans 2022; 51:3159-3169. [PMID: 35112677 DOI: 10.1039/d1dt04183e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Doping Gd2LuAl5O12:Ce with a Ca2+/Si4+ pair produced a series of Gd1.97-xLuCaxAl5-xSixO12:0.03Ce (x = 0.0-1.2) garnet new phosphors, and remarkable regulation of the crystal structure and Ce3+ luminescence was achieved. Rietveld refinement and spectral analysis revealed that greater incorporation of Ca2+/Si4+ led to a higher lattice rigidity by cell contraction, a narrower bandgap, a longer average bond length/less distortion of the [CeO8] dodecahedron and decreased centroid shift/crystal field splitting of the Ce3+ 5d energy level. A blue-shifted 4f-5d1 transition, a narrower emission band, improved thermal stability of luminescence and a shorter fluorescence lifetime were observed with increasing Ca2+/Si4+ content. Applying the yellowish-green-emitting Gd0.77LuCa1.2Al3.8Si1.2O12:0.03Ce optimal phosphor (x = 1.2), together with a commercial CaAlSiN3:Eu red phosphor, in 450 nm-excited LED lighting produced a low CCT of ∼3625 K and a high CRI/R9 of ∼95.2/94.8, indicating that the phosphor has application potential in high-performance w-WLED.
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Affiliation(s)
- Qinghong Meng
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Guoying Zhao
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.,Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
| | - Qi Zhu
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Xudong Sun
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China.,Foshan Graduate school of Northeastern University, Foshan, Guangdong 528311, China
| | - Ji-Guang Li
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
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9
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Cao M, Tian J, Zhuang W, Liu R, Liu Y, Chen G, Zhou G, Wang L, Wang J. Multisite Cation Regulation of Broadband Cyan-Emitting (Ba 1-xSr x) 9Lu 2Si 6O 24/Eu 2+ Phosphors for Full-Spectrum wLEDs. Inorg Chem 2022; 61:1805-1815. [PMID: 35021010 DOI: 10.1021/acs.inorgchem.1c03190] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Developing broadband cyan-emitting phosphors is an essential issue to achieve high-quality full-spectrum phosphor-converted white light-emitting diodes. Multisite cation regulation to modify the photoluminescence spectrum is a valid way to achieve broadband emission for phosphors. The Ba9Lu2Si6O24 lattice with various cation sites for activator ions is a preferred host for broadband emitting phosphors. The preferential crystallographic sites of Eu2+ in the Ba9Lu2Si6O24 lattice are identified based on the crystal field theory, crystal structure, and bond indices (such as NAC and SBOs) of the cations. Sr substitution in Ba9Lu2Si6O24/Eu2+ phosphor affects the location of Eu2+ activator ions, which is investigated via the first-principles density functional theory calculations, Rietveld refinement, and luminescence decay curves, and results in the modification of luminescence properties and thermal stability. The Sr-substituted (Ba0.8Sr0.2)9Lu2Si6O24/Eu2+ sample exhibits a broadband emission spectrum peaked at 471 and 518 nm with a large full width half maximum of 139 nm, covering blue-cyan-green regions, which can be an excellent candidate as broadband cyan-emitting phosphors for high-quality full-spectrum wLEDs.
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Affiliation(s)
- Min Cao
- National Engineering Research Center for Rare Earth, General Research Institute for Nonferrous Metals Group Co., Limited, Beijing 100088, China.,GRIREM Advanced Materials Co., Limited, Beijing 100088, China.,General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Junhang Tian
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.,Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
| | - Weidong Zhuang
- General Research Institute for Nonferrous Metals, Beijing 100088, China.,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.,Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
| | - Ronghui Liu
- National Engineering Research Center for Rare Earth, General Research Institute for Nonferrous Metals Group Co., Limited, Beijing 100088, China.,GRIREM Advanced Materials Co., Limited, Beijing 100088, China.,General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Yuanhong Liu
- National Engineering Research Center for Rare Earth, General Research Institute for Nonferrous Metals Group Co., Limited, Beijing 100088, China.,GRIREM Advanced Materials Co., Limited, Beijing 100088, China.,General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Guantong Chen
- National Engineering Research Center for Rare Earth, General Research Institute for Nonferrous Metals Group Co., Limited, Beijing 100088, China.,GRIREM Advanced Materials Co., Limited, Beijing 100088, China.,General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Gege Zhou
- Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Limin Wang
- General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Jianwei Wang
- General Research Institute for Nonferrous Metals, Beijing 100088, China
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10
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Yang H, Li P, Ye Z, Huo X, Wang Y, Wu Q, Wang D, Zhao J, Wang F, Wang Z. Improvement of the thermal stability of bluish-cyan emitting phosphor Y2MgAl4SiO12:Eu2+ using substitution cations (Zn, Ca, Sr) for white LEDs. CrystEngComm 2022. [DOI: 10.1039/d1ce01414e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A series of bluish-cyan color adjustable phosphors Y2MgAl4SiO12:xEu2+(YMAS) and Y2(Mg1−y,My)Al4SiO12:Eu2+ (M = Zn, Ca, Sr) were synthesized by the solid-state method.
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Affiliation(s)
- Huifang Yang
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Panlai Li
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Zejun Ye
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Xiaoxue Huo
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Yu Wang
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Qian Wu
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Dawei Wang
- Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials, Baoding, 071000, China
| | - Jinxin Zhao
- Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials, Baoding, 071000, China
| | - Fenghe Wang
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Zhijun Wang
- Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
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11
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Xu Y, Dong Y, Tao C, Li P, Wang Z. The high thermal stability of white emitting phosphor Mg 2 Y 2 Al 2 Si 2 O 12 :Dy 3+ , Eu 3+ , La 3+ /Lu 3+ for white LEDs. LUMINESCENCE 2021; 37:551-557. [PMID: 34951100 DOI: 10.1002/bio.4181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/28/2021] [Accepted: 12/02/2021] [Indexed: 11/06/2022]
Abstract
A series of Mg2 Y2 Al2 Si2 O12 :Dy3+ , Eu3+ were prepared by the solid-state method, and the phosphor can emit white light by tuning the ratio of Dy3+ /Eu3+ . The effects of La3+ /Lu3+ on the structure and luminescent properties of Mg2 Y2 Al2 Si2 O12 :Dy3+ , Eu3+ were explored. Under the influence of bond length and twist, the luminescent intensity of the materials increased first and then decreased under the excitation of ultraviolet light. The lattice distortion of the trivalent cation La3+ substituted Mg2 Y2 Al2 Si2 O12 :Dy3+ and Eu3+ phosphors are reduced, the symmetry of polyhedron occupied by the luminescent center is improved, and the thermal stability of the luminescent center is improved to a certain extent. The white light emitting diodes (LEDs) were fabricated by combining the 370 nm LED chip and Mg2 Y2 Al2 Si2 O12 :Dy3+ , Eu3+ , La3+ (Mg2 Y2 Al2 Si2 O12 :Dy3+ , Eu3+ , Lu3+ ) phosphor. The results show that Mg2 Y2 Al2 Si2 O12 :Dy3+ , Eu3+ , La3+ /Lu3+ may be potential application in the region of white light emitting diodes.
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Affiliation(s)
- Yanmei Xu
- College of Mathematics and Physics, North China Electric Power University, Baoding, China
| | - Yufei Dong
- College of Mathematics and Physics, North China Electric Power University, Baoding, China
| | - Chunjing Tao
- College of Physics Science & Technology, Hebei University, Baoding, China
| | - Panlai Li
- College of Physics Science & Technology, Hebei University, Baoding, China
| | - Zhijun Wang
- College of Physics Science & Technology, Hebei University, Baoding, China
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12
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Meng Q, Zhao G, Zhu Q, Li X, Sun X, Li JG. Site-selective and cooperative doping of Gd 3Al 5O 12:Ce garnets for structural stabilization and warm WLED lighting of low CCT and high CRI. Dalton Trans 2021; 51:645-654. [PMID: 34908062 DOI: 10.1039/d1dt03599a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Synergistic doping of the metastable Gd3Al5O12:Ce garnet with a Ca2+/Hf4+ pair and Sc3+ to form Gd2.97-xCaxHfxScyAl3O12:0.03Ce (x = 0.5-2.0, y = 0.0-1.5, x + y = 2.0) solid solution was conducted for the structural stabilization and photoluminescence manipulation. The site selection of Ca2+/Hf4+/Sc3+ dopants and the effects of doping on the crystal structure, local coordination, band structure and Ce3+ luminescence were revealed in detail with the results of XRD, Rietveld refinement, TEM, and UV-Vis/photoluminescence spectroscopy. A decrease in Ca2+/Hf4+ and an increase in the Sc3+ content were observed to shrink the lattice, widen the bandgap of the garnet host, red-shift the excitation/emission wavelength, broaden the emission band and shorten the fluorescence lifetime of Ce3+. The spectral changes were rationalized by considering the local coordination and crystal field splitting of the Ce3+ 5d energy level. Application of typical Gd0.97Ca2Hf2Al3O12:0.03Ce (x = 2.0, y = 0) cyan and Gd2.47Ca0.5Hf0.5Sc1.5Al3O12:0.03Ce (x = 0.5, y = 1.5) greenish-yellow phosphors in w-WLED lighting produced low correlated color temperatures of ∼3842 and 3514 K, high color rendering indices of ∼88 and 93 and favorable luminous efficacies of ∼32.9 and 14.7 lm/W under the excitation of 395 nm n-UV and 450 nm blue LED chips, respectively.
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Affiliation(s)
- Qinghong Meng
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Guoying Zhao
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.,Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
| | - Qi Zhu
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Xiaodong Li
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Xudong Sun
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) and School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China.,Foshan Graduate school of Northeastern University, Foshan, Guangdong 528311, China
| | - Ji-Guang Li
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
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13
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Zhu Z, Tao C, Wang Z, Yang Z, Li P. Luminescence and energy transfer of warm white-emitting phosphor Mg 2Y 2Al 2Si 2O 12:Dy 3+,Eu 3+ for white LEDs. RSC Adv 2021; 11:32707-32716. [PMID: 35493552 PMCID: PMC9042242 DOI: 10.1039/d1ra06215h] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 09/18/2021] [Indexed: 02/01/2023] Open
Abstract
A series of Mg2Y2Al2Si2O12:Dy3+,Eu3+ phosphors were synthesized by the solid-state method. The luminescent properties and crystal structures of the Mg2Y2Al2Si2O12:Dy3+,Eu3+ phosphors were analyzed. The XRD results show that the synthesized Mg2Y2Al2Si2O12:Dy3+,Eu3+ phosphors are of pure phase. Mg2Y2Al2Si2O12:Dy3+ can emit blue and yellow light under 367 nm light excitation; when doped with Eu3+, there is an obvious energy transfer from Dy3+ to Eu3+, and warm white light can be realized by adjusting the concentrations of Dy3+ and Eu3+ in Mg2Y2Al2Si2O12. A warm white LED device was fabricated by combining Mg2Y1.88Al2Si2O12:0.05Dy3+,0.07Eu3+ and a UV LED chip (370 nm) under a voltage of 3.2 V and current of 5 mA, the characteristics of the white LED being CIE = (0.4071, 0.3944), CCT = 3500 K and CRI = 91.3. MYAS:xDy3+,yEu3+ can produce warm white light with CIE chromaticity coordinates of (0.4071, 0.3944) and relative color temperature of 3500 K.![]()
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Affiliation(s)
- Zizhong Zhu
- College of Physics Science & Technology, Tangshan Normal University Tangshan 063000 China
| | - Chunjing Tao
- College of Physics Science & Technology, Hebei University Baoding 071002 China
| | - Zhijun Wang
- College of Physics Science & Technology, Hebei University Baoding 071002 China
| | - Zhiping Yang
- College of Physics Science & Technology, Hebei University Baoding 071002 China
| | - Panlai Li
- College of Physics Science & Technology, Hebei University Baoding 071002 China
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14
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Tao C, Li P, Li Q, Zhang N, Wang D, Zhao J, Yang Z, Wang Z. Improvement of thermal stability and photoluminescence in Mg 2Y 2Al 2Si 2O 12:Ce 3+ by the cation substitution of Ca 2+, Sr 2+ and Ba 2+ ions. Dalton Trans 2021; 50:13138-13148. [PMID: 34581353 DOI: 10.1039/d1dt02336e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The luminescence of Ce3+ in Mg2Y2Al2Si2O12 (MgYAlSiO6) can be controlled by substituting with Ca2+, Sr2+, and Ba2+ ions. The materials show blue shifts in their emission spectra that become highly evident with the increase in the ionic radius, and this phenomenon is the result of the combined action of the nephelauxetic effect and crystal field splitting. Due to the introduction of Ca2+, Sr2+, and Ba2+, the distortion of the crystal decreases and the structural rigidity and stability increase, improving the quantum efficiency and temperature stability of Mg2Y1.93Al2Si2O12:0.07Ce3+. Mg2Y1.93Al2Si2O12:0.07Ce3+,Ca2+ is more stable than Mg2Y1.93Al2Si2O12:0.07Ce3+,Sr2+/Ba2+ because the radius of Sr2+/Ba2+ is larger than that of Mg2+. The Mg1.9Y1.93Al2Si2O12:0.07Ce3+,0.1Ca2+ fluorescent powder and blue chip were packaged to obtain warm white light-emitting diodes (LEDs) with luminous efficiency of 60 lm W-1. These results show that the Mg2Y2Al2Si2O12:Ce3+ phosphor has potential application value in white LEDs.
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Affiliation(s)
- Chunjing Tao
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Panlai Li
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Qinshan Li
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Nan Zhang
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Dawei Wang
- Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials, Baoding, 071000, China
| | - Jinxin Zhao
- Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials, Baoding, 071000, China
| | - Zhiping Yang
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
| | - Zhijun Wang
- National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
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15
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Ma Y, Zhang L, Huang J, Wang R, Li T, Zhou T, Shi Z, Li J, Li Y, Huang G, Wang Z, Selim FA, Li M, Wang Y, Chen H. Broadband emission Gd 3Sc 2Al 3O 12:Ce 3+ transparent ceramics with a high color rendering index for high-power white LEDs/LDs. OPTICS EXPRESS 2021; 29:9474-9493. [PMID: 33820375 DOI: 10.1364/oe.417464] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/05/2021] [Indexed: 06/12/2023]
Abstract
The discovery of single structure Ce3+ doped garnet transparent ceramics (TCs) with a broad full width at half maximum (FWHM) is essential to realize a high CRI for high-power white light emitting diodes (LEDs) and laser diodes (LDs). In this work, by utilizing the ion substitution engineering strategy, pure phase Gd3Sc2Al3O12:Ce3+ (GSAG:Ce) TC with a broad FWHM of 132.4 nm and a high CRI value of 80.7 was fabricated through the vacuum sintering technique for the first time. The optimized in-line transmittance of TCs was 58.4% @ 800 nm. Notably, the GSAG:Ce TCs exhibited a remarkable red shift from 546 nm to 582 nm, with a high internal quantum efficiency (IQE) of 46.91%. The degraded thermal stability in Ce:GSAG TCs was observed compared with that of Ce:YAG TC, owing to the narrowed band gap of GSAG. Additionally, remote excitation white LEDs/LDs were constructed by combining GSAG:Ce TCs with blue LED chips or laser sources. A tunable color hue from yellow to shinning white was achieved in white LEDs, whereas the acquired CRI and CCT of the white LDs were 69.5 and 7766 K, respectively. This work provides a new perspective to develop TCs with high CRI for their real applications in high-power white LEDs/LDs.
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16
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Abstract
Improving thermal stability of nitride phosphors has become an important material challenge. Our review describes three thermal phenomena, lists strategies for enhancing thermal stability of nitride phosphors, and discusses prospects in the future.
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Affiliation(s)
- Junhang Tian
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
| | - Weidong Zhuang
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, China
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17
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Gao T, Tian J, Liu Y, Liu R, Zhuang W. Garnet phosphors for white-light-emitting diodes: modification and calculation. Dalton Trans 2021; 50:3769-3781. [DOI: 10.1039/d0dt04368k] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we outline our recent research progress in the modification and the first-principles calculations of garnet phosphors which should be helpful in guiding scientists to discover novel garnet phosphors for emerging applications.
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Affiliation(s)
- Tongyu Gao
- National Engineering Research Center for Rare Earth Materials
- GRINM Group Co., Ltd
- Beijing 100088
- China
- GRIREM Advanced Materials Co., Ltd
| | - Junhang Tian
- Department of Physical Chemistry
- School of Metallurgical and Ecological Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Yuanhong Liu
- National Engineering Research Center for Rare Earth Materials
- GRINM Group Co., Ltd
- Beijing 100088
- China
- GRIREM Advanced Materials Co., Ltd
| | - Ronghui Liu
- National Engineering Research Center for Rare Earth Materials
- GRINM Group Co., Ltd
- Beijing 100088
- China
- GRIREM Advanced Materials Co., Ltd
| | - Weidong Zhuang
- Department of Physical Chemistry
- School of Metallurgical and Ecological Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
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18
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Yantake R, Sidike A, Yusufu T. Effect of Eu3+ doping on luminescence properties of a KAlSiO4:Sm3+ phosphor. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2020.10.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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