MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Renping Cao,Zhiyi Huang,Bang Lan,Lan Li,Xuehua Yi,Zhiyang Luo,Chenxing Liao,Jing Wang
Ca 3 Zn 3 Te 2 O 12 :Bi 3+ , Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Ca 3 Zn 3 Te 2 O 12 :Eu 3+ /Bi 3+ are prepared successfully in air. The crystal phase, microscopic image, and optical properties of samples are investigated by the X-ray difractometer, scanning electron microscopy, and edinburgh steady-state FLS 980 spectrograph. The green emission of Ca 3 Zn 3 Te 2 O 12 :Bi 3+ phosphor with excitation at 314 nm is observed and its broad emission spectrum in the range of 360 - 790 nm is attributed to the 3 P 1 → 1 S 0 transition of Bi 3+ ion. Under excitation at 395 nm, the red emission of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ is found, the chromaticity coordinates are (0.6392, 0.3605), and its PL spectrum is in the rang of 575 - 750 nm because of the 5 D 0 → 7 F 0 , 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transations of Eu 3+ ion. The doping Bi 3+ ion can affect the luminescence properties of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ phosphor. The adjustable color light from green to yellow of Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ phosphor with excitation at 314 nm is revealed when Eu 3+ concentration is changed from 0 to 12 mol%. When the excitation wavelength is 395 nm, Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ phosphor only emits red light with emission spectrum in the rang of 575 - 750 nm. The energy level diagrams of Eu 3+ and Bi 3+ in Ca 3 Zn 3 Te 2 O 12 :Eu 3+ , Bi 3+ are drawn, which is used to analyze the luminous mechanism of samples.
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 Materiomics
·
2022
·
IF 8.589
Ge Gao,Qiang Li,Pengxiao Hao,Xiao Huang,Hongjie Luo
In this work, a series of Zn x Mg 1.99- x SnO 4 :0.01Mn 2+ ( x = 0, 0.01, 0.02, 0.03, 0.04) green long afterglow phosphors are prepared by high-temperature solid-phase reaction. The photoluminescence and long afterglow performance of host material doped with Zn 2+ are investigated. The results show that the emission peak of Mn 2+ is red-shifted by 5 nm with increasing Zn 2+ concentration. Zn 0.03 Mg 1.96 SnO 4 :0.01Mn 2+ phosphor has the strongest green luminescence intensity with the chromaticity coordinates of (0.085 7, 0.608 3) under 270 nm, and Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ phosphor has superior long afterglow performance with average lifetime of 102.41s. The afterglow decay and thermoluminescence curve of phosphor are used to explain the mechanism of long afterglow luminescence. Meanwhile, the afterglow intensity distribution of each pixel in Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ coating samples is carried out by hyperspectral imaging, and the optimal luminescence intensity and uniformity of the sample are obtained at a phosphor/epoxy mass ratio of 0.002 5. Therefore, Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ can be a potential candidate of novel long afterglow phosphors, and hyperspectral imaging also provides new research approaches for the rational proportioning of luminescent materials.
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
·
2022
·
IF 4.171
Qingling Zeng,Wenxiang He,Ning Zhang,Dongcai Guo
Sr 2 SnO 4 :Eu 3+ phosphors were prepared by a co-precipitation combined with hydrothermal method for the first time, and Li + was introduced to improve its luminescence performance. X-ray diffraction analysis determined that Sr 2 SnO 4 :Eu 3+ , Li + phosphors were successfully synthesized. The effects and mechanisms of Li + doping on the luminescence properties of Sr 2 SnO 4 :Eu 3+ were specifically discussed. At 260 nm excitation, the fluorescence spectra of the products were dominated by the 5 D 0 - 7 F 1 characteristic emission peak of Eu 3+ at 598 nm, with the electric dipole transition 5 D 0 - 7 F 2 being distinctly lower than the magnetic dipole transition 5 D 0 - 7 F 1 , indicating that Eu 3+ selectively replaced the highly symmetrical defective sites of Sn 4+ . The luminous intensity and decay lifetime were significantly enhanced through co-doping Li + , which played an essential role as a charge compensator. The optimum doping concentration of Li + was 7%. Finally, the color purity of Sr 2 SnO 4 :Eu 3+ , Li + reached 99.9%, suggesting that it could be developed as a potential orange-emitting material for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2015
·
IF 2.353
Renping Cao,Tao Liang,Wensheng Li,Chunyan Cao,Yufeng Wen,Qianglin Hu
Sr [1−3( x + y )/2] Al 2 B 2 O 7 : x Eu 3+ , y Bi 3+ ( x = 0–5 mol% and y = 0–5 mol%) phosphors are synthesized by a solid-state reaction method in air, and their crystal structure, fluorescence lifetime, and luminescence properties are investigated. The optimal composition is determined to be (Sr 0.94 Eu 0.03 Bi 0.01 )Al 2 B 2 O 7 . The PLE band peaks within the range 200–550 nm are due to O 2− → Eu 3+ charge transfer band, 7 F 0 → 5 H 3 , 5 D 4 , 5 L 7 , 5 L 6 , 5 D 3 , 5 D 2 , and 5 D 1 transitions, respectively. The strongest PL band peak under excitation 394 nm light is at ∼615 nm owing to 5 D 0 → 7 F 2 transition of Eu 3+ ion. The PL intensity of Eu 3+ , Bi 3+ co-doped SrAl 2 B 2 O 7 phosphor is 1.3 times that of Eu 3+ doped SrAl 2 B 2 O 7 phosphor due to the energy transfer between Eu 3+ and Bi 3+ ions, which is explained by the energy level diagrams of Bi 3+ and Eu 3+ ions. The CIE chromaticity coordinates of Sr 0.955 Al 2 B 2 O 7 :0.03Eu 3+ and Sr 0.94 Al 2 B 2 O 7 :0.03Eu 3+ , 0.01Bi 3+ phosphors under excitation 394 nm light are ( x = 0.6292, y = 0.3702) and ( x = 0.6284, y = 0.3711), respectively. These phosphors will be used as reddish orange emitting phosphor candidate for white LED with ∼394 nm near ultraviolet LED chip.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2019
·
IF 3.319
Mengjiao Xu,Yi Ding,Wanxia Luo,Luxiang Wang,Suxia Li,Yanhong Liu
A new multicolor-emitting Tb 3+ -Eu 3+ codoped KAlP 2 O 7 (KAPO) phosphor was synthesized by solid-state reaction under the air atmosphere. The synthesis, morphology, luminescence properties , energy transfer mechanisms and thermal stability of the synthesized phosphor were systematically investigated. The codoped phosphor exhibited the characteristic emission of Eu 3+ at 612 nm ( 5 D 0 - 7 F 2 ) and Tb 3+ at 544 nm ( 5 D 4 - 7 F 5 ). Under ultraviolet (UV) excitation, KAPO: Tb 3+ , Eu 3+ shows tunable emission from green-yellow to red with increasing of Eu 3+ concentration due to efficient Tb 3+ -Eu 3+ energy transfer. Based on the decay curves, the energy transfer from Tb 3+ to Eu 3+ was classified to be of dipole-dipole interaction resonant type with energy transfer efficiency of ~97%. The excellent luminescent properties and remarkable thermal stabilities suggested that KAPO: Tb 3+ , Eu 3+ is a promising UV-converting material for the fields of lighting and displays.
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 ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 7
·3361-3366
·
IF 1.491
Cao Renping,Han Peng,Luo Wenjie,Fu Ting,Luo
Zhiyang,Liu Pan,Chen Zhiquan,Yu Xiaoguang
Novel CaZrO 3 :Sm 3+ , Bi 3+ phosphor is synthesized by a solid-state reaction method in air and the crystal structures and luminescence properties are investigated. The emission spectrum with excitation 308 nm contains emission of Sm 3+ and Bi 3+ ions at the same time; however, it only has an emission of Sm 3+ ion with excitation 408 nm. Emission intensity of CaZrO 3 :Sm 3+ phosphor can be enhanced about four times owing to energy transfer from the Bi 3+ ion to the Sm 3+ ion and with the fluxing agent role of Bi 3+ ion when Bi 3+ ion is co-doped. The possible luminous mechanism is analyzed by energy level diagrams of Bi 3+ and Sm 3+ ions and the energy transfer process in CaZrO 3 :Sm 3+ , Bi 3+ phosphor. The experimental results indicate that, hopefully, CaZrO 3 :Sm 3+ , Bi 3+ phosphor can be used as a reddish orange phosphor candidate for white light-emitting diodes based on near an ultraviolet (~408 nm) chip.
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
·
2016
·
IF 2.435
Renping Cao,Haidong Xu,Wenjie Luo,Zhiyang Luo,Siling Guo,Fen Xiao,Hui Ao
Novel Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor is synthesized by solid-state reaction method in air. Host Ca 2 MgWO 6 with excitation 300 nm emits blue light. Ca 2 MgWO 6 :Bi 3+ phosphor with excitation 300 and 338 nm emits yellow light. Ca 2 MgWO 6 :Sm 3+ phosphor with excitation 300 nm exhibits tunable emission from blue to red light by increasing Sm 3+ doping concentration from 0 to 8 mol%, however, only emits red light with excitation 407 nm. Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor with excitation 300 and 338 nm emits red light. The optimal Sm 3+ doping concentration is ∼5 mol% in Ca 2 MgWO 6 :Sm 3+ phosphor. After Bi 3+ ion is co-doped, luminescence properties of Ca 2 MgWO 6 :Sm 3+ phosphor can be improved obviously because of Bi 2 O 3 as fluxing agent role and energy transfer from Bi 3+ to Sm 3+ ions. The possible luminous mechanism of Ca 2 MgWO 6 :Sm 3+ , Bi 3+ phosphor is analyzed and explained by simplified energy level diagrams of WO 6 6− group, Bi 3+ and Sm 3+ ions.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 14
·11174-11183
·
IF 2.779
Cui Zheng,Deng Guowei,Xu Pan,Liu Xiaoyang,Yang Min,Wang Qiliang
In this work, doped and co-doped LaNbO 4 :RE 3+ (RE = Eu, Eu/Tb, Tb) single crystals were prepared by a unique hydrothermal method under the condition of supercritical water and a wide temperature range (823–923 K). The crystal structure of LaNbO 4 :Eu 3+ /Tb 3+ were refined by virtue of the Rietveld method, which can determine the occupation position of dopants. The luminescence properties of Eu 3+ /Tb 3+ -doped LaNbO 4 phosphors were carefully measured and analyzed by diffuse reflectance spectra and ultraviolet. The energy transfer was recognized between host and doped Eu 3+ /Tb 3+ ions based on the luminescence spectra and decay lifetimes, which is dominated by electric multipolar interaction. The results show that the strong emission peaks at 491 nm ( 5 D 4 – 7 F 6 ), 550 nm ( 5 D 4 – 7 F 5 ), 590 nm ( 5 D 4 – 7 F 4 ), 623 nm ( 5 D 4 – 7 F 3 ) can be observed at the optimum reaction temperature of 650 °C, corresponding to CIE coordinates (0.3398, 0.3288). By adjusting the concentration of Eu 3+ /Tb 3+ ions, the emission colors of LaNbO 4 :Eu 3+ /Tb 3+ are varied from blue to pink and to white. Consequently, the synthesis strategy reported herein not only holds extensive promise for expanding the preparation techniques of materials with good luminescence properties but also promotes the practical applications of LaNbO 4 single crystal in low color temperature and high index white light-emitting diode (WLED).
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 MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Renping Cao,Yunfei Zheng,Ting Chen,Bang Lan,Lan Li,Qinghu Zhong,Shuijing Nie,Jing Wang
In this work, Ca 3 MgSi 2 O 8 :R ( R = Dy 3+ , Eu 3+ , and Eu 3+ /Dy 3+ ) phosphors are synthesized in air by using the high-emperature solid-state reaction method. The crystal phase, crystal structures, lifetimes, and luminescence properties are investigated. Ca 3 MgSi 2 O 8 :Eu 3+ phosphor with excitation at 394 nm emits red-orange light and its emission spectrum covers the region from 575 nm to 720 nm due to the 5 D 0 → 7 F 0 , 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 MgSi 2 O 8 :Dy 3+ phosphor under excitation at 350 nm exhibits yellow-green emission with four emission bands in the range of 460–500 nm, 550–600 nm, 650–680 nm, and 740–775 nm, which are attribuited to the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ ion, respectively. The energy transfer from Dy 3+ to Eu 3+ ions in Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor can be confirmed by the spectral properties. The tunable emission properties of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor from yellow-green to red-orange can be fulfilled by the change of the excitation wavelength or the concentration proportion between Dy 3+ and Eu 3+ ions. The luminous mechanism and energy transfer of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor are explained by the energy level diagrams of Eu 3+ and Dy 3+ 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 Research Express
·
2021
·Vol. 8
·期 10
·105002
·
IF 1.62
Wenchang Xi,Pan Jian,Xisong Mao,Deyang Ning,Xuewen Xia,Guohua Liu,Dongyang Shi,Yuanpei Lan
In this work, aiming to evaluate and compare the luminescent property of Eu3+ doped La(OH)3 nanorods and its decomposed compounds of LaOOH and La2O3, La(OH)3: Eu3+ nanorods were synthesized and the decomposition behaviors in air and hydrogen were revealed. Then the luminescent property of 0%–8% Eu3+ doped La(OH)3 nanorods and the 300 °C–800 °C calcined La(OH)3: Eu3+- 4% were studied. Results show that LaOOH is intermediate product during the degradation of La(OH)3 in air or H2, which can be formed at a temperature range in 372.3 °C–592.9 °C in air. Intensity of emission spectra of La(OH)3: Eu3+ nanorods increases with the rising of Eu3+ dopant concentration, and the emission property of Eu3+ doped LaOOH and La2O3 is varied and strengthened with that of La(OH)3: Eu3+. Luminescent matrixes of LaOOH and La2O3 show similar emission spectrum and intensity, and the transitions of the D0 → 7F1 and D0 → 7F2 of Eu3+ each bifurcate into two peaks for both europium (III) doped La2O3 and LaOOH. The revealed results suggest that LaOOH is a relative thermal-stable compound and should be an appropriate matrix as similar as La2O3 for luminescent applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
DeCai Huang,YouFu Zhou,WenTao Xu,Kun Wang,Zhuguang Liu,MaoChun Hong
Non-rare-earth-metal Mn 2+ and Eu 2+ co-doped BaSi 3 O 4 N 2 phosphors were synthesized by solid state reaction method. The effect of Mn 2+ concentration upon photoluminescence behavior was investigated systematically. The specimens were efficiently excited from UV to visible region. The green emission of Eu 2+ was greatly enhanced by Mn 2+ due to the co-excitation and energy transfer between Mn 2+ and Eu 2+ . The energy transfer probability from Mn 2+ to Eu 2+ depends strongly on the concentration of Mn 2+ with the maximum at 6 mol%. Furthermore, corresponding quantum efficiency and thermal stability were dramatically improved. Through the assembly of as-prepared green phosphor, YAG:Ce 3+ and Sr 2 Si 5 N 8 :Eu 2+ phosphors with 460 nm InGaN chip, a broad range of white light was obtained bearing with color temperature of 3585–3650 K and color-rendering index of 95–98, exhibiting an attractive candidate for the application in phosphor converted light-emitting diodes (pc-LEDs).
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 73
·期 7
·1761-1766
·
IF 1.246
Zhang Li-hui,Zhou Yan-biao,Li Wei-li,Zhao Xu-yao,Wang Ya-bo
Lu(OH)CO 3 :Ln 3+ /LuBO 3 :Ln 3+ (Ln = Eu, Tb) nanospheres have been synthesized by the soft chemistry route. This synthesis process does not require the addition of any organic solvents and surfactant. The whole process consists of homogeneous precipitation and hydrothermal process. First, uniform spherical Lu(OH)CO 3 :Ln 3+ (Ln = Eu, Tb) nanoparticles with the sizes of 70 nm were obtained by the classic urea-based homogeneous precipitation. Then, with the above Lu(OH)CO 3 :Ln 3+ (Ln = Eu, Tb) nanosphere as the precursor, the composites of Lu(OH)CO 3 :Ln 3+ /LuBO 3 :Ln 3+ (Ln = Eu, Tb) nanospheres formed by the simple hydrothermal process. The phases, morphologies, as well as the luminescence properties of as-prepared samples were characterized by means of X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and photoluminescence. Under a short wavelength excitation, the down-conversion Eu 3+ and Tb 3+ -doped LuBO 3 samples were investigated and explained.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）