Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2837-2849
·
IF 5.934
Peipei Dang,Dongjie Liu,Guogang Li,Sisi Liang,Hongzhou Lian,Mengmeng Shang,Jun Lin
Recently, controllable photoluminescence tuning by devising a solid solution framework, adjusting the valence mixing of Eu2+/Eu3+ and designing efficient energy transfer between activator ions has been extensively investigated and reported due to its significant advantages in the improvement and regulation of the luminescence performances of white light-emitting diodes (W-LEDs). In this study, we designed a series of novel Eu2+-doped (1 − x)Ca3(PO4)2–xCa9Y(PO4)7 (x = 0–1.0) isostructural solid solution phosphors with a β-Ca3(PO4)2-type structure, and powder samples were prepared via the traditional high-temperature solid-state reaction process. The crystal field variation around the Eu2+ ions causes superposition of linear luminescence and induces optical property tuning with a change in the solid solution ratio, x, values. Besides the high-energy emission peak at 418 nm in Ca3(PO4)2:0.03Eu2+, another low-energy emission peak at 486 nm was observed with the formation of the solid solution. Moreover, the corresponding high-energy emission peaks shifted from 418 to 430 nm, and the luminescence intensity of the low-energy emission at 486 nm increased with an increase in x, which was attributed to the combined effect of crystal field splitting of the local lattice and superposition of linear luminescence. In addition, tunable emission across the whole white light region could be realized by constructing a solid solution and adjusting the overall Eu concentration in (1 − x)Ca3(PO4)2–xCa9Y(PO4)7:Eu (x = 0.5, 0.7, 0.9, and 1.0), and the corresponding luminescence mechanisms have been proposed and discussed in detail. In the pursuit of precise color tuning, we also tested the Eu2+ → Mn2+ energy transfer in different compositions (x = 0.2, 0.5, 0.7, and 0.9) of the solid solution phosphors, and successive emission tuning from the blue and cyan range and then the red range was successfully achieved. Finally, the temperature-dependent photoluminescence and decay time were revealed systematically, and the corresponding mechanisms for the thermal quenching behavior have been discussed. This study provides a new perspective for color tuning originating from the simultaneous isostructural solid solution, valence mixing of Eu2+/Eu3+ and efficient energy transfer.
研究领域:
材料科学
·
光学材料
·
无机化学
·
固体物理
·
发光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Jian Li,Zhi-yong Mao,Da-jian Wang,Ying-chun Zhu,Lin Gan,Fang-fang Xu
Tunable white light of Eu 2+ doped SiAlON crystal/glass composite phosphor with blue-yellow dual-emissions was demonstrated by variation of excitation wavelength in this work. The excitation properties of blue emission originated from the transition of Eu 2+ ions in the Si–Al–B–O–N glass matrix and that of yellow emission originated from the transition of Eu 2+ ions in the SiAlON lattice were investigated, respectively. By varying the excitation wavelength in the range of 330–380 nm, white emission was tuned from cool white to warm white for this SiAlON crystal/glass composite phosphor owing to the various excitation properties of these two emission bands. Presented results indicate that this tunable SiAlON crystal/glass composite white-light phosphor might be applied in white LED, combining with UV chips with different emitting wavelengths in the range of 330–380 nm.
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
DALTON TRANSACTIONS
·
2023
·Vol. 53
·期 3
·996-1003
·
IF 4
Qiang Zhang,Xin Ding,Bin Liu,Yuhua Wang
The development of novel phosphors with excellent luminescence properties for white light-emitting diodes (WLEDs) is always a formidable task. Compared with the traditional laborious and aimless “trial and error” experiments, a mineral-inspired prototype strategy can provide an efficient and accurate method. Herein, for the first time, a novel yellow-emitting phosphor NaBaY2(PO4)3:Eu2+ was discovered using the mineral-inspired prototype strategy and cation substitution method. The phosphor was prepared via the high-temperature solid-state reaction method, and its crystal structure, luminescence properties and potential application for WLEDs were systematically investigated. The NaBaY2(PO4)3 phase was derived from the K2Mg2(SO4)3-type mineral structure and a photoluminescence study revealed that the phosphor can emit bright yellow light with a maximum at 545 nm upon excitation at 351 nm. A WLED lamp was fabricated by the use of a blend of commercial blue-emitting BaMgAl10O17:Eu2+, yellow-emitting NaBaY2(PO4)3:Eu2+ and red-emitting (Ca, Sr)AlSiN3:Eu2+ phosphors with a 380 nm LED chip. The CIE, CCT, Ra and efficiency of the as-fabricated LEDs were measured to be equal to (0.366, 0.365), 4327 K, 91.2 and 40.8 lm W−1, respectively. These results suggest that NaBaY2(PO4)3:Eu2+ could be a promising candidate for n-UV WLEDs.
研究领域:
材料科学
·
无机化学
·
光电子学
·
半导体照明
·
发光材料
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Weihao Ye,Xiaotang Liu,Qiying Huang,Zhiping Zhou,Guangqi Hu
Europium doped Calcium fluoride (CaF 2 :Eu 2+ ) nanoparticles have been synthesized by co-precipitation method using different surfactants, in which anhydrous ethanol was used as solvent and the nanoparticles was sintered in air. The self-reduction was observed in the as-prepared CaF 2 :Eu 2+ nanoparticles and can be explained by charge compensation model based on the substitution. Scanning electron microscope (SEM) and X-ray power diffraction (XRD) showed that the nanoparticles were about 50 nm⿿1 μm and in a single phase. A broad emission centered at 425 nm due to Eu 2+ 4f 7 ⿿4f 6 5d 1 transition has been observed with excitation bands between 337 and 385 nm by the fluorescence spectrometer. The corresponding excitation spectra showed a wide excitation range in the violet region due to 4f 7 ( 8 S 7/2 ) ⿿ 4f 6 5d 1 (t 2g ) The luminescent properties of the phosphor was thoroughly examined. Furthermore, the effect of using different surfactants on the sizes of CaF 2 :Eu 2+ nanoparticles, related mechanisms was also investigated.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 15
·2735-2742
·
IF 0
Chun-Yun Wang,Rong-Jun Xie,Fangzhi Li,Xin Xu
A phase pure SrSi2O2N2:Eu2+ green phosphor was synthesized by a solid state reaction through careful control of the Sr : Si ratio in the starting powder consisting of SrCO3, Si3N4 and Eu2O3. The thermal degradation of the phosphor was investigated by baking it at high temperatures for 2 h. The surface states of the samples before and after baking were analyzed by SEM, HRTEM, XPS, TGA/DTA, and high temperature in situ X-ray diffraction. The results showed that the thermal degradation became intense when the temperature was higher than 500 °C, and the degradation was caused by the formation of SrSiO3 on the particle surface and the oxidation of Eu2+ to Eu3+. It is suggested that the thermal stability can be enhanced by achieving high crystallinity as well as high phase purity of the phosphor.
研究领域:
材料科学
·
固态化学
·
光学材料
·
荧光粉技术
·
照明工程
✓ 已验证
DOI
OPTICAL MATERIALS
·
2014
·Vol. 36
·期 11
·1855-1858
·
IF 2.075
Jin Wang,Haoran Zhang,Bingfu Lei,Hanwu Dong,Haiming Zhang,Yingliang Liu,Nuolin Lai,Yun Fang,Zhijie Chen
The red persistent and photo-stimulated luminescent (PSL) nitride phosphor, SrCaSi 5 N 8 : Eu 2+ , Tm 3+ solid solution, had been synthesized through conventional high temperature solid-state reaction. The SrCaSi 5 N 8 : Eu 2+ , Tm 3+ phosphor shows strong photoluminescence (PL) and weak PSL ( λ em = 647 nm), both originating from the 4f 6 5d–4f 7 transition of Eu 2+ . Thermoluminescence (TL) glow curves measured at various stimulating conditions (UV excitation, in dark, laser stimulation after UV irradiation) show the same peak positions at 345 K and 360 K but great differences in the intensities. The afterglow decay curve presents excellent long-lasting red phosphorescence with a decay time of 30 min (⩾0.32 mcd/m 2 ) after turning off the activating light. Moreover, the laser stimulated luminescence spectra, which feature sharp rising and falling edges (monitored at 647 nm) as the infrared laser diode (980 nm) excitation was turned on and off periodically, exhibit interesting rapidly responsive, erasable and rewritable abilities.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学性质
✓ 已验证
DOI
高影响因子
Radiation Effects and Defects in Solids
·
2023
·
IF 1
Chao Xu,Shenao Yu,Linxing Shi,Yuanyuan Zhang,Qile Li
The red persistent luminescence phosphors SrS: Eux2+, Pry3+ (x = 0∼0.001, y = 0∼0.003) were synthesized by the solid-state reaction method in a weak reducing atmosphere of active carbon. The synthetic parameters, photoluminescence characteristics, and dynamic properties of thermoluminescence of the phosphors were studied systematically. According to the results of photoluminescence spectra of SrS: Eux2+, Pry3+, the energy level scheme of the phosphors was confirmed quantitatively. Based on the studies of the scanning electron microscope (SEM), UV-Visible absorbance spectra, afterglow decay curves, thermoluminescence(TL) spectra, and X-ray photoelectron spectroscopy (XPS) spectra, we found that the SrS: Eu0.00012+, Pr0.0033+ (SSEP) phosphor presented the best persistent luminescence property, which mainly resulted from its outstanding absorbance characteristic, deeper depth of VS⋅ (VS⋅⋅) defects, and fewer defect concentration belonging to the higher-order kinetics. Those comprehensive results deduced that a complex defect VS⋅ (VS⋅⋅)-V′′Sr should present in the Eu2+ doping phosphors, and the Pr3+ doping will produce PrSr⋅ defects, which can suppress the formation of VS⋅ (VS⋅⋅) defects and increase their energy depth.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学性质
✓ 已验证
DOI
高影响因子
Small
·
2026
·
IF 11.8
Chen Bai,Jiarui Duan,Deyin Wang,Yuhua Wang
Optical pressure sensing plays a crucial role in high-pressure research and materials science, yet luminescent manometers that combine high sensitivity with a visually detectable color change remain rare. In this work, a novel Eu 2+ -activated KGa 5 S 8 green-emitting phosphor has been successfully synthesized, demonstrating remarkable piezochromic properties. When the applied pressure is varied from 1 atm (∼0.1 GPa) to 10.44 GPa, a significant spectral redshift is observed in the sample. This results in a visually striking color transition, shifting from a green emission peaking at 541 nm to a red emission peaking at 697 nm. This transition yields an exceptionally high-pressure linear sensitivity of d λ/ d P = 14.49 nm/GPa, marking it as the highest value reported to date among pressure-sensing materials with emission in the visible range. The multicolor emission variation is attributed to pressure-induced electronic structure modulation, enabling sensitive pressure detection. This study provides a new piezochromic phosphor with record sensitivity and an obvious visual color change, offering a promising candidate for high-pressure sensing applications.
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Chaoyang Jia,Dangli Gao,Zhigang Wang,Xiangyu Zhang,Sining Yun,Jin Zhong Zhang,Xiaojun Wang
Persistent luminescence (PersL) phosphors, identified as ideal candidates, hold immense promise for information storage and encryption. However, practical storage and encryption technology using these phosphors remains uncommon due to their weak luminescence intensity and the inconvenience of light sources used in encryption and decryption processes. Here, we have developed Sr 2 MgSiGeO 7 :Eu 2+ ,Mn 2+ ,Dy 3+ phosphor with a super-long PersL beyond 100 h, the higher charge storage capacity and PersL efficiency (17 %) than commercial SrAl 2 O 4 :Eu,Dy phosphors by introduction of co-dopant Mn 2+ . This phosphor exhibits rapid and efficient charging capability when exposed to various light sources such as sunlight, light-emitting diode, mobile phone and computer screen. To explain the high charge storage capacity and super-long PersL, we propose a novel trap mechanism based on hole-electron defect pair trap structures. Notably, this phosphor as an anti-counterfeiting material demonstrates high-order encryption by the adding specific information writing process via temperature management. This study provides a new paradigm for future design of PersL phosphors and luminescent anti-counterfeiting.
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
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Xiaoya Bu,Yan-gai Liu,Baochen Wang,Ruiyu Mi,Ziyao Wang,Zhaohui Huang
The Eu 2+ activated Ca 8 ZnGd(PO 4 ) 7 :Eu 2+ green light emitting phosphors and Eu 2+ /Mn 2+ co-doped tunable light emitting phosphors Ca 8 ZnGd(PO 4 ) 7 :Eu 2+ ,Mn 2+ were successfully synthesized via the solid-state reaction method. The X-ray powder diffraction measurements and Rietveld refinement were used to assess the phase composite and crystal structure. The photoluminescence properties, diffuse reflection spectrum, chromaticity coordinates and fluorescence decay curves of the samples were investigated. It has been confirmed that the resonant type Eu 2+ →Mn 2+ energy transfer occurs via a dipole-quadrupole interaction. With various Eu 2+ /Mn 2+ molar ratios, the spectrum-tunable phosphors are obtained from green (0.183, 0.335) to white (0.297, 0.298).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Heng-Wei Wei,Xiao-Ming Wang,Huan Jiao,Xi-Ping Jing
Powder samples of Ba 3 Si 6 O 12 N 2 and Ba 3 Si 6 O 9 N 4 were synthesized by solid state reaction method at 1300–1400 °C in H 2 /N 2 (6:94) reductive atmosphere. The structural correlations between the two phases were analyzed based on X-ray diffraction data and neutron diffraction data. The results indicate that Ba 3 Si 6 O 12 N 2 can be converted into Ba 3 Si 6 O 9 N 4 when three O 2− are replaced by two N 3− , meanwhile, one trigeminal N(SiO 3 ) 3 group of two in the unit cell is transformed into (SiO 2 N) 3 ring. The luminescent properties of Eu 2+ doped Ba 3 Si 6 O 9 N 4 were investigated. Ba 3 Si 6 O 9 N 4 :Eu 2+ gives wide excitation and emission spectra since the dopant occupy three different Ba sites. The phosphor shows green luminescence color with three emission peaks at 370 nm, 405 nm and 520 nm excited in the range of 210 nm–470 nm. Both luminescence spectra and decay curves indicate that in the Eu 2+ doped Ba 3 Si 6 O 9 N 4 , the energy transfer occurs from the luminescence centers for the shorter wavelength emissions (Eu1 at 370 nm and Eu2 at 405 nm) to the center for the longer wavelength emissions (Eu3 at 520 nm). The Eu 2+ doped sample has potential application in white LEDs.
研究领域:
材料科学
·
无机化学
·
发光与光电子学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 34
·23708-23715
·
IF 3.9
Lei Liu,Xianying Shao,Zhenyuan Zhang,Jiayu Liu,Yuebo Hu,Chaofeng Zhu
Eu-doped aluminosilicate oxyfluoride glass prepared via a melt-quenching method was investigated using X-ray diffraction, absorption spectroscopy, X-ray fluorescence spectrometry, photoluminescence spectroscopy and fluorescence decay curves. We found that the reduction of Eu3+ to Eu2+ ions occurred in the glass prepared in air. The emission spectra showed that the intensity of 4f65d → 4f7 transition of Eu2+ ions varied with increasing incident beam wavelength. Meanwhile, the fluorescence lifetimes of Eu3+: 5D0 → 7F2 monitored at 617 nm in the glass change with the variation of excitation wavelength. The energy transfer between Eu2+ and Eu3+ and the emission mechanisms of Eu2+ ions in the glass were also discussed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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