CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yao Yang,Yanli Shi,Junjing Duan,Kailei Lu,Gang Cheng,Yiding Zhao,Zhangyi Huang,Peitong Li,Nian Wei,Xinghua Zhu,Jianqi Qi,Tiecheng Lu
The exploration of new red phosphors is important for the development of white light-emitting diodes (w-LEDs), as existing red phosphors exhibit low efficiency and low performance. This work aims to enhance the photoluminescence characteristics of a red-emitting Gd 2 Zr 2 O 7 :Eu 3+ phosphor by co-doping with Al 3+ . Eu 3+ single-doped and Eu 3+ and Al 3+ co-doped Gd 2 Zr 2 O 7 nanophosphors that could be efficiently pumped by commercial near-UV LED chips were prepared by a modified liquid–solid–solution phase-transfer method. X-ray diffraction data revealed that the synthesized phosphors were well crystallized with single-phase fluorite structure. Scanning electron microscopy images showed that the particle size ranges from 15 to 25 nm. In addition, the optical performance of the samples was characterized by fluorescence spectroscopy and lifetime spectroscopy. The effect of Al 3+ on the luminescence performance of the Eu 3+ -doped Gd 2 Zr 2 O 7 phosphor was studied in detail. The emission intensity of the Gd 1.93 Zr 1 · 97 O 7 :Eu 3+ 0.07 Al 3+ 0.03 phosphor was found to be 620% stronger than that of the single-doped Eu 3+ phosphor. These results unambiguously show that the Gd 1.93 Zr 2- x O 7 :Eu 3+ 0.07 Al 3+ x phosphors are promising candidates for application in w-LEDs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Pengjun Zhang,Yifei Xu,Shuwei Hao,Chongqiang Zhu,Chunhui Yang
The conventional random co-doping of Tb 3+ and Eu 3+ leads to spatial separation that severely limits energy transfer efficiency between these ions, which is critical for minimizing non-radiative losses in white LEDs. To address the limitation, we designed BaTb 4- x Si 3 O 13 : x Eu 3+ , breaking through the bottleneck by occupying Tb 3+ sites with Eu 3+ . Rietveld refinement and ionic radius analysis confirmed site occupancy selectivity, enabling 71.59 % Tb 3+ →Eu 3+ energy transfer efficiency, which is higher than conventional random doping systems. Under 380 nm excitation, the phosphor yielded red emission with CIE coordinates of (0.6153,0.3838) and 86.64 % color purity, and exhibited exceptional thermal stability with 70 % intensity retention at 473 K. Fabricated wLEDs using a NUV chip with commercial blue phosphor, green phosphor, and the developed phosphor produced warm white light with a correlated color temperature of 4519 K and CIE coordinates of (0.3478, 0.3868), achieving a high color rendering index of 87.4. These results demonstrate BaTb 4 Si 3 O 13 :Eu 3+ as a highly promising red phosphor candidate for solid-state lighting applications.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 1
·151-158
·
IF 1.563
Liu Chenglu,Wang Fang,Jia Peiyun,Lin Jun,Zhou Zhiqiang
Eu3+ and Dy3+-doped YVO4 nanocrystallites were successfully prepared at 400 °C in equal moles of NaNO3 and KNO3 molten salts. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electronic
microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanocrystallites. XRD results demonstrate that NaOH concentration and annealing temperature play important roles in phase purity and crystallinity of the nanocrystallites, the optimum NaOH concentration
and annealing temperature being 6:40 and 400 °C respectively. TEM micrographs show the nanocrystallites are well crystallized with a cubic morphology in an average grain size of about 18 nm. Upon excitation of the vanadate group at 314 nm, YVO4:Eu3+ and YVO4:Dy3+
nanocrystallites exhibit the characteristic emission of Eu3+ and Dy3+, which indicates that there is an energy transfer from the vanadate group to the rare earth ions. Moreover, the structure and luminescent properties of the nanocrystallites were compared with their
bulk counter-parts with same composition in detail.
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PubMed
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2022
·Vol. 77
·期 7
·715-722
·
IF 1.712
Jinghao Zhuang,Wenlin Feng,Bo Zhou,Qili Zhang,Chong Liu,Yao Gong
A series of CaSr(WO 4 ) 2 : Eu 3+ and CaSr(WO 4 ) 2 : Eu 3+ , Li + phosphors with different Eu 3+ or Eu 3+ /Li + molar contents were successfully synthesized by high-temperature solid-state reaction. Through a series of characterization methods, the composition, structure and luminescence characteristics of the sample are obtained. Upon excitation at 393 nm, the strong red light corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ can be observed. The effect of Li + charge compensation on the photoluminescence of the sample is studied. The strongest red emission is obtained through 1% Eu 3+ and 1% Li + doping. All of the results indicate that Li + charge compensation can effectively enhance the red emissions intensity of Eu 3+ -doped CaSr(WO 4 ) 2 phosphors.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Leixuan Li,Yanxin Wang,Wei Xing,Xiaotong Zhang,Hanwen Wang,Huiyi Wu,Jian Wang,Linjun Huang,Jianguo Tang
Recently, the application of rare earth elements in LEDs has attracted widespread attention. This article conducts in-depth research on rare earth fluorescent nanofiber membrane materials. Firstly, Eu 3+ , 2-thenoyltrifluomacetonate (tta), and 1,10-phenanthroline (Phen) undergo a complexation reaction to form the Eu(tta) 3 Phen complexes. The highly efficient fluorescent hybrid material SiO 2 @Eu(tta) 3 Phen prepared by using a straightforward doping method to mix the Eu(tta) 3 phen complexes with synthetic silica nanoparticles. Fluorescent nanofiber membranes that emit uniform red light was prepared by loading SiO 2 @Eu(tta) 3 Phen onto PVA nanofiber membrane (PNM) and SiO 2 nanofiber film (SNF) by filtration. After calculation, the loading amount of FSNF and FPNM were 55.6 % and 38.4 %, respectively. It was found that SiO 2 fluorescent nanofiber film (FSNF) had better fluorescence performance than PVA fluorescent nanofiber membrane (FPNM) under excitation at 384 nm wavelength. FSNF and FPNM were applied to LED components, both of which exhibited excellent fluorescence. The chromaticity coordinate (x, y) of FSNF is (0.6545, 0.3418), the correlated color temperature (CCT) is 1000K. The chromaticity coordinate ( x , y ) of FPNM is (0.6496, 0.3396), with a correlated color temperature (CCT) of 1000K. However, FSNF has a significant improvement in the persistence of ultraviolet irradiation compared to FPNM. These findings demonstrate that the developed FSNF have tremendous potential in white LEDs.
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Advanced Optical Materials
·
2024
·
IF 8
Noor Zamin Khan,Sayed Ali Khan,Nisar Muhammad,Weilong Chen,Jahangeer Ahmed,Muhammad Amin Padhiar,Mei Chen,Marcin Runowski,Saad M. Alshehri,Baohua Zhang,Shu-Sheng Pan,Ren-Kui Zheng
Sr 3 CaNb 2 O 9 :Dy 3+ /Eu 3+ phosphors with a complex perovskite structure are prepared using a high-temperature solid- state reaction technique. These phosphors are doped either singly or in combination with Dy 3+ /Eu 3+ ions, resulting in efficient energy transfer from Dy 3+ to Eu 3+ and thus tunable-color emission. Under 353 nm excitation, the Sr 3 CaNb 2 O 9 :Dy 3+ phosphor emits blue (492 nm), yellow (583 nm), and red (682 nm) light, with the optimal doping concentration of Dy 3+ of 0.04%. When excited by 394 nm ( 7 F 0 → 5 L 6 ), the Sr 3 CaNb 2 O 9 :Eu 3+ phosphor exhibits two most intense emissions centered at 593 nm ( 5 D 0 → 7 F 1 ) and 614 nm ( 5 D 0 → 7 F 2 ). The decrease in luminescence intensity with increasing doping concentration of Dy 3+ and Eu 3+ is due to the cross-relaxation associated with electric dipole–dipole interaction. Photoluminescence emission measurements under excitations of 353 and 365 nm indicate that the Sr 3 CaNb 2 O 9 :0.04Dy 3+ /0.05Eu 3+ phosphor shows excellent thermal stability, even at a temperature of 150 °C, where the luminescence intensity preserves 79% of its initial value at room temperature. The electroluminescence performance of the Sr 3 CaNb 2 O 9 :0.04Dy 3+ /0.05Eu 3+ phosphor is tested with 365 nm LED chips for potential use in white LEDs. The results confirm that Sr 3 CaNb 2 O 9 :0.04Dy 3+ /0.05Eu 3+ phosphor has great potential for use in high-power white LED applications as a single matrix.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kangliang Peng,Huiqing Xu,Xueqing Yang,Lin Chen,Lifang Chen
The exploitation of phosphors with tunable color emissions is of great significance in the field of display and lighting. Herein, a series of Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors have been successfully synthesized via a high-temperature solid-state reaction method. The luminescence properties of the synthesized NaMgPO 4 phosphors were systematically investigated. The incorporation of Dy 3+ enables the tuning of emission peaks in NaMgPO 4 :Eu 3+ phosphors through an efficient energy transfer (ET) process from Eu 3+ to Dy 3+ , thereby facilitating white light emission in a single-composition phosphor. Eu 3+ and Eu 2+ co-activated NaMgPO 4 phosphors were achieved by controlling the reduction of Eu 3+ to Eu 2+ under a reducing atmosphere generated by activated carbon. Photoluminescence (PL) spectra revealed simultaneous blue emission from Eu 2+ and red emission from Eu 3+ . By varying the amount of activated carbon, tunable emission colors can be realized in the Eu 3+ /Eu 2+ codoped NaMgPO 4 phosphors. Consequently, through the strategic design of rare-earth ion codoping, the Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors exhibit promising practical applications in phosphor-converted white light-emitting diodes (LEDs).
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 2
·e20200
·
IF 3.5
Fei Wang,Huihui Chen,Shiwei Zhang,Huiqing Jin
The development of red phosphors with good thermal stability, high quantum yield and high color purity is still a big challenge. In this work, a series of novel red phosphors Sr 3 La 2 W 2 O 12 : x Eu 3+ (0≤ x ≤0.18, ∆ x = 0.03) were successfully prepared by high-temperature solid-phase method. The phosphors reveal a hexagonal phase with the space group of R-3 m. The phosphor Sr 3 La 2 W 2 O 12 :Eu 3+ produced narrowband red emission from 5 D 0 → 7 F 2 of Eu 3+ (616 nm) under excitation at 395 nm, 465 nm, and 533 nm. Importantly, phosphor Sr 3 La 2 W 2 O 12 :0.09Eu 3+ exhibits astonishing quantum efficiency (IQE = 89.60%, EQE = 41.52%), and it demonstrate robust thermal performance with the emission intensity retaining 92.73% at 558 K of that at 298 K. Finally, the prepared red phosphor Sr 3 La 2 W 2 O 12 :0.09Eu 3+ and yellow phosphor YAG:Ce 3+ were combined with a blue LED chip (460 nm) to form a WLED device, which presented warm white light with color coordinates of (0.3523, 0.3732), color rendering index of 83.7, and color temperature of 4826 K.
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RARE METALS
·
2012
·Vol. 31
·期 6
·599-603
·
IF 0.593
Li Yanhong,Lu Haiyan,Zhang Yongming,Ma Jing,Song Guoyi
Nanocrystalline Gd 3 Ga 5 O 12 :Eu 3+ with cubic phase was prepared by a urea homogeneous precipitation method. X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric and differential thermal analysis (TG-DTA) and photoluminescence spectra were used to characterize the samples. The effects of the initial solution pH value and urea content on the structure of the sample were studied. The XRD results show that pure phase Gd 3 Ga 5 O 12 can be obtained at pH =6 and pH =8 of the initial solution. The average crystallite size can be calculated as in the range of 24∼33 nm. The average crystallite size decreases with increasing molar ratio of urea to metal ion. The results of excitation spectra and emission spectra show that the emission peaks are ascribed to 5 D 0 → 7 F J transitions of Eu 3+ , and the magnetic dipole transition originated from 5 D 0 → 7 F 1 of Eu 3+ is the strongest; the broad excitation bands belong to change transfer band of Eu-O and the host absorption of Gd 3 Ga 5 O 12 . An efficient energy transfer occurs from Gd 3+ to Eu 3+ .
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JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Yiru Wang,Xiaohua Liu,Pengfei Niu,Lindan Jing,Weiren Zhao
Novel Eu 3+ activated Gd 2 Mo 4 O 15 phosphors were synthesized at the comparatively low temperature of 700 °C via solid-state reaction. X-ray powder diffraction results demonstrate that the phosphors crystallize in the triclinic crystal structure, the space group P I ¯ . The photoluminescence spectra and ultraviolet-visible (UV–vis) reflectance and transmittance spectra indicate that Eu 3+ doped Gd 2 Mo 4 O 15 phosphors show a broad and strong absorption band covering ultraviolet (UV) and near ultraviolet (NUV) regions and the crystals emit red light with peak maximum at about 618 nm under excitation of UV, NUV or blue light. The optimal doping concentration of Eu 3+ ions in Gd 2 Mo 4 O 15 phosphors is around 50 mol% and the main concentration quenching mechanism is determined to be the exchange interaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yunan Lin,Peiyuan Zhuang,Xiaoting Gao,Wudeng Wang,Guorui Li,Zheng Wei,Yanjie Zhang,Jingjie Yu
With the rapid advancement of information technology, anti-counterfeiting requirements across diverse scenarios have become increasingly stringent, thereby spurring significant interest in multifunctional luminescent materials integrating photochromic and luminescence-tunable properties. However, traditional anti-counterfeiting technologies mainly depend on single color emitting phosphors, hardly meeting the requirements of high-level encryption and anti-counterfeiting. Herein, CsPbBr 3 /LiGa 5 O 8 : Eu 3+ perovskite quantum dots (PQDs) phosphors with red-green bicolor emission have been successfully developed via the solution impregnation method. The CsPbBr 3 PQDs uniformly supported on the surface of LiGa 5 O 8 : Eu 3+ phosphors can effectively endure high-temperature calcination and maintain the average particle size of ∼5.0 nm even after calcination at 400°C, avoiding the serious problem of aggregation and luminescence quenching of PQDs at high temperatures. CsPbBr 3 /LiGa 5 O 8 : Eu 3+ PQDs phosphors exhibit a red emission peak at 620 nm under excitation at 254 nm and a green emission peak at 530 nm under excitation at 365 nm, attributed to the transitions of Eu 3+ ions and CsPbBr 3 PQDs, respectively. Notably, the green emission intensity of CsPbBr 3 /LiGa 5 O 8 : Eu 3+ PQDs phosphors calcined at 400°C increases by 36 times compared to the uncalcined sample, attributed to the fact that the bromine vacancies in CsPbBr 3 quantum dots are passivated by the oxygen of LiGa 5 O 8 lattice. The fluorescence lifetime rises by ∼900 %, from 19.05 ns of uncalcined sample to 171.43 ns of CsPbBr 3 /LiGa 5 O 8 : Eu 3+ PQDs phosphors calcined at 400℃, owing to suppressed electron-hole recombination via PQDs loading. X-ray photoelectron spectroscopy (XPS) results further verify that 400°C calcination plays a significant role in boosting the green emission of samples. Based on the unique red-green dual-color emission characteristics of the CsPbBr 3 /LiGa 5 O 8 : Eu 3+ PQDs phosphors, an anti-counterfeiting strategy encompassing invisible labels and information encryption via binary and Morse codes is proposed. Therefore, CsPbBr 3 /LiGa 5 O 8 : Eu 3+ PQDs phosphors hold potential applications in invisible pattern display, tunable photochromism, information encryption and other related fields.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Tingting Zhang,Yang Wang,Bin Cao,Yixi Lu,Hongmei Chen,Mo Zhou,Yonghao Wang,Chaoyong Deng,Weichao Huang
A series of Mn 4+ /Eu 3+ co-doped double-perovskite Sr 3 LiSbO 6 phosphors was successfully synthesized by the high-temperature solid-state method. The Sr 3 LiSbO 6 : Mn 4+ phosphor exhibits a broad far-red emission band centered at 693 nm, which is assigned to the 2 E g → 4 A 2g transition of Mn 4+ ions. The doping of Eu 3+ ions realizes the regulation of emission spectra, and the phosphors with red/far-red double-peak emission (611 and 693 nm) are obtained. The spectrum is suitable for plant lighting because of its good overlap with the absorption band of phytochrome P R and P FR . Notably, the presence of Eu 3+ enhances the emission intensity of Mn 4+ by 1.56 times due to the synergistic effect of charge compensation and local lattice tuning. These results indicate that Sr 3 LiSbO 6 : Mn 4+ /Eu 3+ phosphors are promising materials for applications in plant cultivation.
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