JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 4
·2903-2913
·
IF 3.784
Ke Su,Qingfeng Guo,Pengfei Shuai,Ning Liu,Lefu Mei,Libing Liao
Pyroxene-type phosphors were widely developed due to the advantages of high chemical stability, luminous efficiency, and low production cost. In this contribution, a series of Eu 2+ /Tb 3+ co-doped Ca 0.75 Sr 0.2 Mg 1.05 Si 2 O 6 (CSMS) phosphors with pyroxene structure were successfully synthesized by the solid-state method. Under the 340 nm excitation, the emission peaks of the phosphor show a redshift with the increase of Eu 2+ concentration. The emitting color of Eu 2+ /Tb 3+ co-doped samples shows a redshift attributed to the energy transfer from Eu 2+ to Tb 3+ . Simultaneously, acquired thermometer exposes superbly temperature-sensitive properties ( S a and S r having maximum values 4.7% K −1 and 0.6% K −1 , respectively) over the cryogenic temperature range (77–280 K). Furthermore, it has good stability and precision at cryogenic temperatures, indicating that CSMS:0.03Eu 2+ /0.03Tb 3+ phosphor is a very promising fluorescent material suitable for cryogenic temperature sensing.
研究领域:
材料科学
·
发光材料
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光学测温
·
无机化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Tianrui Zhou,Yuexin Song,Da Xu,Jingjing Chen,Zhiyong Mao,Dajian Wang
In this work, veritable carbothermal synthesis of SrAlSi 4 N 7 :Eu 2+ red-emitting phosphors using entire oxides raw materials and the elimination of residual carbon survived in materials via non-thermal plasma oxidation route are demonstrated. The crystal structure and photoluminescent properties of carbothermal-synthesized SrAlSi 4 N 7 :Eu 2+ phosphors and the residual carbon elimination effect of non-thermal plasma oxidation are investigated in detail. Experiment results show that the residual carbon survived in carbothermal-synthesized SrAlSi 4 N 7 :Eu 2+ phosphors could be eliminated effectively by non-thermal plasma oxidation, leading to the significant enhancement of luminescent properties. The presented work affords an economic carbothermal reduction method to synthesize nitride phosphors using low cost entire oxides raw materials and recommends a promising approach to eliminate the residual carbon in carbothermal-synthesized materials.
研究领域:
材料科学
·
荧光粉化学
·
固态照明
·
等离子体处理
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2015
·Vol. 5
·期 4
·1494-1502
·
IF 1.484
Wangqing Shen,Yiwen Zhu,Zhengling Wang
Sr4Si3O8Cl4co-doped with Eu2+, Bi3+were prepared by the high temperature reaction. The structure and luminescent properties of Sr4Si3O8Cl4:Eu2+, Bi3+were investigated. With the introduction of Bi3+, luminescent properties of these phosphors have been optimized. Compared with Sr3.90Si3O8Cl4:0.10Eu2+, the blue-green phosphor Sr3.50Si3O8Cl4:0.10Eu2+, 0.40Bi3+shows stronger blue-green emission with broader excitation in near-UV range. Bright blue-green light from the LED means this phosphor can be observed by the naked eye. Hence, it may have an application in near UV LED chips.Keywords:luminescent properties;phosphors;light-emitting diodes;Sr4Si3O8Cl4
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·2235-2243
·
IF 3.094
Xiuxia Yang,Lei Zhao,Wei Zeng,Zhichao Liu,Xiaotong Fan,Shuyu Tian,Hao Zhang,Xuhui Xu,Jianbei Qiu,Xue Yu
Fluorescent anti-counterfeiting technologies have become indispensable by virtue of their high concealment properties. In this work, the observation of the characteristic emission originated from Eu 2+ and Eu 3+ ions in CaYAl 3 O 7 realizes a dual-mode anti-counterfeiting strategy. The host matrix provides an environment, where blue and red emission could be manipulated with the introduction of Nd 3+ ions for the reduced occupation of Eu 3+ in the sites of Y 3+ ions. Moreover, the photoluminescence spectra of these samples exhibit time and temperature-dependent dynamic changes thanks to the capture and release of carriers in the reconstructed traps induced by Nd 3+ ions. Herein, a multi-stimuli responsive dynamic and static anti-counterfeiting could be achieved in this work.
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DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Daiyuan Liu,Ru Zhao,Chao Wang,Zhichao Liu,Jian Zhang,Yuan Wang,Xue Yu,Jianbei Qiu,Xuhui Xu,Yichun Liu
High-quality phosphors with color tunability are urgently needed for the full-spectrum white light-emitting diodes (WLEDs) with healthy and comfortable lighting like the solar spectrum. Here, a Sr 2 Ga 2 SiO 7 : Eu 2+ phosphor with tunable luminescence color is reported, achieving a luminescence tuning from maize-yellow to yellow by changing the Eu 2+ ion concentration. Importantly, the quantum efficiency of BaSrGa 2 SiO 7 : 1.0 % Eu 2+ is as high as 85.7 % compared with 49.1 % of Sr 2 Ga 2 SiO 7 : 5.0%Eu 2+ , and the emission intensity of BaSrGa 2 SiO 7 : 1.0 % Eu 2+ retains 92 % of the room temperature (RT) emission intensity at 473 K by Ba 2+ substitution. Furthermore, the increase of Ba 2+ ion concentration also makes the phosphor achieve tunability from yellow to green. The as-prepared full-spectrum WLEDs exhibits a continuity spectrum like solar spectrum with an extremely high color rendering index of 93.5 and low correlated color temperature of 4562 K. This work provides new insights into the exploration of new phosphors for high-performance full-spectrum WLEDs devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Chengyan Gao,Guojun Zhou,Yawen Deng,Qiufeng Shi,Lei Wang,Haijie Guo,Jianwei Qiao
Eu 2+ -activated phosphors are prominent candidates for next-generation solid-state lighting, but their performance is often limited by incomplete Eu 3+ reduction and poor thermal stability. Herein, we present a universal strategy combining a two-step synthesis with charge compensation to simultaneously stabilize Eu 2+ centers and suppress parasitic Eu 3+ . Initially, M 2 SiO 4 :Eu 2+ ( Pnma ) precursors were synthesized to promote effective Eu 2+ incorporation. Subsequent P 5+ co-doping induces charge-compensated substitution (Si 4+ →P 5+ ). This structural evolution yields the target phosphor phases: the yellow-emitting Li 2 SrSi 0.96 P 0.04 O 4 :Eu 2+ ( P 3 1 21) and the green-emitting Li 2 BaSi 0.96 P 0.04 O 4 :Eu 2+ ( P 6 3 cm ) with excitation/emission maxima at 394/580 and 365/520 nm, respectively. Importantly, the heterovalent substitution facilitates the Eu 3+ →Eu 2+ reduction and optimizes the defect distribution. Consequently, the photoluminescence quantum yield (PLQY) is significantly enhanced from 26% to 78% for Li 2 SrSi 0.96 P 0.04 O 4 :Eu 2+ and from 32% to 83% for Li 2 BaSi 0.96 P 0.04 O 4 :Eu 2+ , along with improved thermal stability (93.3%@450 K). Fabricated near-UV pumped white light-emitting diodes (LEDs) incorporating these phosphors demonstrate superior color rendering ( Ra = 91.1) and stable electroluminescence across varying currents. The robust Eu 2+ stabilization and charge compensation paradigm paves the way for rational design of high-performance phosphors for advanced lighting.
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
J. Narmai,Yu Zhang,Fengxiang Wang,Xuelian Zhou,Kai Li,Ze Wang,Sur Lig,Hala Muji,Qixu Tian,Qier Sa,Kefu Chao
The advancement of backlighting displays is dependent on the development of efficient narrow-band red phosphors. However, challenges such as low thermal stability and insufficient quantum efficiency restrict their widespread use in high-power LEDs. This study reports the synthesis of various solid solutions of Sr 1-x Ca x LiAl 3 N 4 :Eu 2+ (0 ≤ x ≤ 0.8) (SCLAN:Eu 2+ ) through the partial substitution of strontium with calcium using a low gas pressure sintering method (0.3 MPa). The intentional introduction of cation disorder by substituting Sr with Ca significantly enhances quantum efficiency and suppresses thermal quenching. Comprehensive analysis of SCLAN:Eu 2+ phosphors includes their structural characteristics and luminescence properties, as well as the synthesis and thermal quenching of white-light-emitting diodes (w-LEDs). The substitution of Sr with Ca results in a red shift of the emission peak from 654 nm to 687 nm, with the Ca 2+ substituted sample achieving an internal quantum efficiency (IQE) of 83.2%, surpassing that of SrLiAl 3 N 4 :0.02Eu 2+ (SLAN:0.02Eu 2+ ). Temperature-dependent photoluminescence (PL) spectra demonstrate the remarkable thermal stability of the phosphor, maintaining 109.91% of its original intensity at 425 K, which is critical for the applications of high-power LEDs. Furthermore, the development of a warm w-LEDs device yields a correlated color temperature (CCT) of 4044 K and a luminous efficacy of 99.2 lm/w, with a color rendering index (CRI) of 83.5, utilizing commercial YAG:Ce 3+ yellow phosphor in conjunction with SCLAN:Eu 2+ . The performance characteristics of SCLAN:Eu 2+ phosphors indicate significant potential as red color converters for high-power LEDs and backlighting displays.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Yuan Li,Yao Qian,Haodong Zheng,Ruijing Fu,Yan Chen,Jing Wang
An ultra-broadband green-emitting phosphor K 2 ZnSi 3 O 8 :Eu 2+ with FWHM of 111.8 nm was developed via multi-site occupation of Eu 2+ . • Mg 2+ substitution for Zn 2+ induces local lattice stiffening and defect passivation, boosting PL intensity by 120% . • The optimized phosphor exhibits enhanced thermal stability with increased activation energy (0.261 eV vs. 0.251 eV) and complete intensity recovery after thermal cycling. • A warm WLED fabricated with KZn 0.99 Mg 0.01 SiO 8 :0.01Eu 2+ and commercial red phosphor achieves high color rendering index (Ra = 94.2) and low CCT (3552 K). • This cationic substitution strategy offers an effective route to simultaneously enhance luminescence efficiency, thermal stability, and moisture resistance in rare-earth-doped phosphors. Efficient broadband green-emitting phosphors are essential for human-centric healthy lighting. Herein, an ultra-broadband green-emitting phosphor, K 2 ZnSi 3 O 8 :Eu 2+ , was synthesized by high temperature solid-state reaction method for high-quality white light-emitting diodes (WLEDs). Under ultraviolet excitation, the phosphor exhibits a broad emission band spanning from 400 to 750 nm, peaking at 505 nm with a full width at half maximum (FWHM) of 111.8 nm, which originates from the multi-site occupation of Eu 2+ ions. Moreover, structural engineering via Mg 2+ substitution for Zn 2+ effectively enhances the material's performance. K 2 Zn 0.99 Mg 0.01 Si 3 O 8 :Eu 2+ , shows a 120% increase in emission intensity and improved thermal stability. Finally, a warm WLED fabricated this phosphor with a commercial red phosphor exhibits excellent color rendering index (Ra = 94.2) and a warm correlated color temperature (CCT) of 3552 K, demonstrating its promising application in high-quality healthy solid-state lighting.
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.4
Wang Zhihui,Wang Xiaohua,Jia Yumeng,Wang Jing,Shi Zhongxiang,Yan Qingyun
A narrow-band green-emitting phosphor KAl 11 O 17 (KAO): Eu 2+ , Mn 2+ , was synthesized via a high-temperature solid-state reaction to evaluate its potential for use in high-quality backlight displays. Structural refinement reveals that Eu 2+ and Mn 2+ ions preferentially occupy distinct crystallographic sites: Eu 2+ resides at K + sites in the conductive layer, whereas Mn 2+ substitutes for tetrahedral Al 3+ sites within the spinel block. This spatial separation facilitates efficient energy transfer (ET) from Eu 2+ to Mn 2+ . Spectroscopic analysis of the optimally doped composition, KAO: 0.07Eu 2+ , 0.04Mn 2+ , indicates that the ET proceeds predominantly via a dipole - quadrupole ( d - q ) mechanism. The resulting phosphor exhibits bright green emission centered at 510 nm with an exceptionally narrow full width at half maximum (FWHM) of 8.13 nm, a high color purity of 98%, and an internal quantum efficiency (IQE) of 65.41%. Moreover, the material demonstrates excellent thermal stability, retaining 93.11% of its initial luminescence intensity at 423 K, corresponding to a thermal activation energy of 0.2917 eV. To demonstrate its practical utility, a white LED device was fabricated by combining the optimized green phosphor (KAO: 0.07Eu 2+ , 0.04Mn 2+ ) with a blue phosphor (BaMgAl 10 O 17 (BAM): Eu 2+ ), a red phosphor (Ca 9 KMn(PO 4 ) 7 : Eu 2+ ), and a 365 nm near-ultraviolet chip. The resulting device achieves a wide color-gamut covering 107.8% of the NTSC standard. Collectively, these results demonstrate that precise control of site occupancy and energy transfer enables the design of green phosphors that simultaneously exhibit narrow-band emission, high color purity, and robust thermal stability-properties that are essential for wide color-gamut WLED backlight displays.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanzhi Zhang,Rongmao Li,Xingyang Peng,Xiang Guo,Chaoyong Deng,Ruirui Cui
In this study, a novel orange-red Sr 2 ScGaO 5 : x Eu 2+ phosphor was designed and produced adopting a high-temperature solid-phase technique, and its properties were optimized using a cation substitution strategy of Sr/Ca substitution and Yb 3+ co-doping. Experiments revealed that Eu 2+ doping causes the material to emit orange-red light at 606 nm, with a quantum efficiency of 67.51 %. Replacing Sr 2+ with Ca 2+ further red-shifted the emission peak to 646 nm, broadening the red-light region. Through co-doping with Eu 2+ and Yb 3+ , the thermal stability of the phosphor is significantly improved, with the light emission intensity retention rate at 423 K increasing from 59.84 % to 88.31 %, providing a new approach to enhancing the thermal stability of Eu 2+ -doped phosphors. The WLED devices prepared using Sr 2 ScGaO 5 :0.04Eu 2+ , 1.4Ca 2+ achieved a CRI of 88.1, with a CCT of 3715 K. The WLED device produced using Sr 2 ScGaO 5 :0.04Eu 2+ , 0.03Yb 3+ exhibited a CRI of 90.4 and a CCT of 4076 K. Both performances significantly outperform commercial WLED, effectively addressing the deficiency of insufficient red light in commercial WLED. This phosphor has also been successfully applied in fingerprint recognition, highlighting its potential for multi-domain applications.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态化学
·
发光二极管（LED）
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Chuang Wang,Ying Li,Yurong Shi,Jing Jiang,Shuangyu Xin,Ge Zhu
Oxynitride Ba 3 Si 6 O 12 N 2 :Eu 2+ phosphor can usually exhibit high color purity emission spectrum and outstanding thermal stability because of its rigid structure which can be widely used in WLEDs. With the aim of further optimizing the emission intensity, color purity and thermal stability, Al 3+ -doped Ba 3 Si 6 O 12 N 2 :Eu 2+ green phosphors were successfully prepared by a high-temperature sintering method in the current work. The crystal structure was clearly investigated by the XRD patterns and Rietveld refinement . The expanding volume and elemental analysis proved that Si 4+ ions can be efficiently substituted by Al 3+ ions in the Ba 3 Si 6 O 12 N 2 :Eu 2+ phosphor. With increasing doping of Al 3+ ions, the full width at half maximum decreased from 66.88 to 65.12 nm with an optimal color purity of 65.95%, and the reason was clearly elucidated by the Gaussian fitting spectrum and decay times. Moreover, the emission intensity of Ba 3 Si 6 O 12 N 2 :0.1Eu 2+ , 0.03Al 3+ was 120% of the intensity of the Al-free sample, and the internal quantum efficiency could reach 70%. The thermal stability was also remarkably enhanced as Al 3+ substituted Si 4+ in Ba 3 Si 6 O 12 N 2 :0.1Eu 2+ , and Ba 3 Si 6 O 12 N 2 :0.1Eu 2+ , 0.03Al 3+ exhibited only 8% emission loss at 200 °C compared with that at ambient temperature. The outstanding thermal stability was clearly explained by the thermoluminescence spectra and configurational coordinate diagram. The results indicate that the introduction of Al 3+ ions can be a versatile method to improve the optical properties of silicon oxynitride.
研究领域:
材料科学
·
光学材料
·
固态化学
·
发光材料
·
LED用荧光粉
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 42
·期 1
·1756-1761
·
IF 2.605
Guanghao Li,Jingjing Chen,Zhiyong Mao,Weiwei Song,Tao Sun,Dajian Wang
A red-emitting Eu 2+ activated CaAlSiN 3 phosphor was successfully prepared via an atmospheric pressure solid-state reaction method with the aid of variable fluxes, namely SrF 2 , NH 4 F, BaF 2 , NaF, AlF 3 , CaF 2 and NH 4 Cl. The experimental results showed that the addition of SrF 2 flux effectively reduced the formation temperature of CaAlSiN 3 : Eu 2+ about 100 °C, improved the morphology of CaAlSiN 3 : Eu 2+ and suppressed the appearance of AlN impurity phase, suggesting that SrF 2 flux modifies the formation mechanism of CaAlSiN 3 : Eu 2+ . The phosphor of the CaAlSiN 3 :Eu 2+ produced with 4 wt% SrF 2 flux had an enhanced emission intensity, which was a result of the high crystallinity , the absence of AlN secondary phases, and the clean surfaces of the particles in the final product.
研究领域:
材料科学
·
光电子学
·
无机化学
·
荧光材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）