CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 55
·13819-13827
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IF 5.236
Pan Liang,Wen-Li Lian,Zhi-Hong Liu
Highly efficient inorganic phosphors are crucial for solid-state lighting. In this paper, a new method of low-temperature self-reduction was used for preparing a highly efficient deep blue-emitting phosphor of Ca[B 8 O 11 (OH) 4 ] : Eu 2+ (CBH : Eu 2+ ). The crystal structure, morphology, chemical state, and photoluminescence (PL) properties of the CBH : Eu 2+ phosphor have been investigated. By using the screened hybrid function (HSE06), the band gap ( E g ) of CBH was calculated to be 7.48 eV, which is a necessary condition for achieving high quantum yield phosphors. The experiment results show that almost all the added raw materials of Eu 3+ can be reduced to Eu 2+ in CBH crystal under a non-reducing atmosphere. The CBH : Eu 2+ phosphor shows a broad excitation spectrum centered at 277 and 327 nm in the range of 220 to 400 nm, and a narrow-band emission spectrum centered at 428 nm in the range of 400 to 500 nm, with a full width at half maximum (fwhm) of 42.35 nm. Under UV radiation, the CBH : 2 %Eu 2+ exhibits high photoluminescence quantum yield (PLQY=95.0 %), high external quantum efficiency (EQE=31.1 %), and ultra-high color purity (97.6 %). The PL intensity of CBH : 2 %Eu 2+ remains 62.6 % of the initial intensity at 150 °C. Finally, the white light-emitting diodes (WLED) fabricated by CBH : 2 %Eu 2+ , excited by a 365 nm chip, presents outstanding performances with a luminous efficacy (LE) of 13.9 lm/W, a color rendering index (CRI) of 89.4, and a correlated color temperature (CCT) of 5825 K. The above results show that CBH : Eu 2+ can be used as a promising blue phosphor for WLED. This new method of low-temperature self-reduction can be applied to design and prepare other new types of highly efficient phosphors. Graphical Through a new method of low-temperature (only 350 °C) self-reduction, a highly efficient deep blue-emitting phosphor Ca[B 8 O 11 (OH) 4 ] : Eu 2+ was prepared, with a high PLQY of 95 % and a color purity of 97.6 %. Then, a WLED fabricated by the as-prepared CBH : 2 %Eu 2+ presents outstanding performance with a luminous efficacy (LE) of 13.9 lm/W, a color rendering index (CRI) of 89.4, and a correlated color temperature (CCT) of 5825 K.
研究领域:
材料科学
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光学材料
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固态照明
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荧光粉化学
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发光学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Yawen Deng,Jianwei Qiao,Dehong Li,Qiufeng Shi,Haijie Guo,Lei Wang,Chengyan Gao,Zhiguo Xia
Highly efficient Eu 2+ -activated phosphors are indispensable for solid-state lighting, yet the parasitic Eu 3+ emission remains a significant efficiency killer. Herein, we report a robust strategy to suppress Eu 3+ formation in Li 2 CaSiO 4 :Eu 2+ via a heterovalent substitution strategy by combining a two-step sintering process with charge compensation. We effectively promote the Eu 3+ →Eu 2+ reduction, boosting the external quantum efficiency (EQE) from 22% to 60%, and the deep defect levels induced by Si 4+ -P 5+ heterovalent substitution impart superior thermal stability to Li 2 CaSi 0.96 P 0.04 O 4 :Eu 2+ (94%@423 K), while retaining a remarkable 98% of its initial intensity after 30 days of water immersion. The as-fabricated phosphor-converted light-emitting diodes achieve a high color rendering index ( R a = 90.6) and a 50% reduction in blue-light hazard, demonstrating great potential for healthy illumination. Notably, this Eu 2+ stabilization strategy also effectively enhances the emission intensity of Li 2 CaGeO 4 :Eu 2+ and Li 2 MSiO 4 :Eu 2+ (M = Sr, Ba), thus establishing a general paradigm for the rational design of high-performance phosphors for next-generation light sources.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Dong Tu,Lingxiao Cui,Haonan Ju,Wenxuan Yao,Yufan Yuan,Hang Yang,Xueqin Liu,Guogang Li
High-Stability USL: SAO:Eu needs no UV radiation, cutting external effects and boosting practical ease and accuracy. • USL modulation: TL and Sm/Dy/Tm doping proved trap depth and carrier density dictate USL intensity. • Non-destructive testing: SAO:Eu USL enables a structural defect detection simpler than conventional ultrasonic testing. Ultrasonic-induced luminescence (USL), as a novel type of mechanically stimulated luminescence phenomenon, has attracted widespread attention in the fields of materials science and engineering in recent years. Currently reported USL materials suffer from poor stability, and most require UV excitation. In this study, we report a highly stable SrAl 2 O 4 :Eu 2+ material that does not require pre-excitation by a UV lamp. This material exhibits excellent stability in cyclic testing. By combining USL measurements at different pre-treatment temperatures with thermoluminescence testing, and by introducing different activating ions, we establish a close relationship between USL and the carrier density in the traps. Furthermore, a novel structural defect detection method was designed based on the USL properties of this material, offering greater simplicity and convenience compared to traditional ultrasonic testing. This study not only delivers a material with high stability for USL but also introduces a novel paradigm for industrial nondestructive testing.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenke Ruan,Shuli Gu,Wei Li,Heru Li,Qianchuan Xiao,Mubiao Xie
The development of efficient, tunable excitation/emission and sustainable luminescence mode single-phase inorganic luminescent materials plays an important role in the progress of information encryption and advanced anti-counterfeiting technology. Herein, a general high temperature solid phase method was employed to synthesize Bi 3+ and Eu 2+ co-doped BaZrSi 3 O 9 (BZSO) phosphors, which show properties of spectral tuning and temperature sensitivity and have potential applications in lighting and anti-counterfeiting. The optimized cyan-emitting phosphor BZSO:0.03Bi 3+ ,0.05Eu 2+ phosphor in w-LED devices to significantly improves the color rendering index (CRI) from 89 to 93, while the correlated color temperature (CCT) is reduced from 5002 K to 4609 K. By substitution of Bi 3+ with varying concentrations of Eu 2+ in BZSO, the luminescent color of the hosts can be tuned from yellow to green. The photoluminescence (PL) spectra of BZSO:0.03Bi 3+ ,0.05Eu 2+ sample varies with the excitation wavelength (270 to 420 nm). The prepared powder was mixed with soluble polyvinyl alcohol (PVA) to prepare advanced anti-counterfeiting ink. The prepared of BZSO:0.03Bi 3+ ,0.05Eu 2+ /PVA composite luminescent film not only has good thermal stability, water resistance, transparency, flexibility, foldability and easy processing performance, but also has the characteristics of adjustable multi-mode luminescence and sustainable luminescence. In short, this changing-color and long-lasting luminescent fluorescent material offers the possibility of sophisticated advanced anti-counterfeiting applications in the future.
研究领域:
材料科学
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光学材料
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固态照明
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防伪技术
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发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jialin Cui,Shikun Su,Ruimao Li,Hui Xu,Wenhua Yang,Lizhen Zhao,Wei Qin,Bing Teng,Chen Hu,Shijia Sun,Wei Wang,Haiyang Zhang,Degao Zhong
This study successfully synthesized a melilite-structured multifunctional phosphor, CaLaAl 3 O 7 : Eu 2+ , Eu 3+ , through solid-state reaction under reducing atmosphere. The phosphor demonstrates dual-band emission with contrasting temperature-dependent luminescence behaviors: the blue emission (Eu 2+ , 443 nm) exhibits a sharp intensity decline with rising temperature, whereas the red emission (Eu 3+ , 616 nm) shows only a slight decrease in intensity under the same conditions. This unique property enables high-sensitivity fluorescence thermometry, achieving a maximum relative thermometric sensitivity (S r ) of 2.59 % K −1 at 303 K. Moreover, by utilizing the significant luminescence color changes induced by temperature variations, we have achieved wide-gamut visualization of surface temperature distributions on objects. Under 365 nm UV excitation, the phosphor demonstrates persistent blue luminescence lasting 180 s due to defect energy levels. By integrating multi-wavelength selective excitation, long afterglow, wide color gamut emission, and high sensitivity temperature response, CaLaAl 3 O 7 : Eu 2+ , Eu 3+ demonstrates promising applications in visual temperature detection and information encryption/anti-counterfeiting.
研究领域:
材料科学
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发光材料
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光学测温
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光子学
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防伪技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Quansheng Wu,Yuanmin Zhang,Jingjing Chen,Chunxiang Chen,Faliang Cao,Weijian Wang,Xubo Zhu,Jiasheng Zeng,Jianyan Ding
Developing novel narrow-band light-emitting phosphors remains a critical area of research, particularly for nitride-based materials, which are regarded as promising host for phosphor. In this study, a narrow-band blue light emission was achieved in Eu 2+ -activated nitroaluminosilicate MgAl 4 SiO 3 N 4 through structural optimization of the AlON-related phase Al 6 O 3 N 4 . Mg 2+ ions were incorporated into the host lattice to partially substitute for Al 3+ ions, while co-doped Si 4+ ions were utilized to maintain charge neutrality. Leveraging the high reactivity of MgO , MgAl 4 SiO 3 N 4 was successfully synthesized under relatively mild conditions, in contrast to the initial phase of Al 6 O 3 N 4 . Furthermore, through structural optimization, Eu 2+ -activated MgAl 4 SiO 3 N 4 exhibits remarkable photoluminescence and cathodoluminescence performance. When excited by near-ultraviolet light, MgAl 4 SiO 3 N 4 :Eu 2+ emits intense narrow-band blue light, characterized by a full width at half maximum (FWHM) of 0.338 eV. The material exhibits an internal quantum efficiency as high as 74 %. The structure-property relationship of Eu 2+ in MgAl 4 SiO 3 N 4 was systematically investigated in this study, elucidating the photoluminescence characteristics of Eu 2+ ions within the MgAl 4 SiO 3 N 4 host. The results may establish an efficient pathway for exploring more promising silicate- or aluminum nitride-based narrow-band light-emitting phosphors.
研究领域:
材料科学
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光学材料
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磷光体化学
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固态照明
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显示技术
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 16
·6132-6138
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IF 4.097
Wanyuan Li,Rong-Jun Xie,Tianliang Zhou,Lihong Liu,Yuejin Zhu
The promising green oxynitride phosphor, Ba3Si6O12N2:Eu2+, was synthesized at 1350 °C for 5 hours under a reducing N2/H2 (5%) atmosphere by using the solid-state reaction method. The phase purity was investigated by varying the nominal compositions, and the pure phase was achieved by carefully controlling the Si/Ba and O/Ba ratios. The phosphor displayed a broad excitation band spanning from the ultraviolet (UV) to the blue spectral region, and showed a single symmetrical emission band peaking at 525 nm with a full width at half maximum (FWHM) of ∼68 nm. The as-prepared green phosphor exhibited a small thermal quenching, which remained 90% of the initial emission intensity when measured at 200 °C. The internal and external quantum efficiencies measured under 450 nm excitation were 68 and 38%, respectively. Color temperature-tunable white LEDs with a high color rendering index of Ra = 88–94 were attained by combining the prepared green phosphor and a red phosphor Sr2Si5N8:Eu2+ with a blue LED chip.
研究领域:
材料科学
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无机化学
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发光材料
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半导体照明
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光电工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 31
·11703-11712
·
IF 4.569
Jun Sun,Minghui Zhou,Bei Zhang,Youjie Hua,Feifei Huang,Hongping Ma,Renguang Ye,Shiqing Xu
A series of Rb1−yKyNa3(Li3SiO4)4:Eu2+(0 ≤ y ≤ 1) phosphors were successfully synthesized through a high-temperature solid-state reaction. The introduction of K+ into the RbNa3(Li3SiO4)4:Eu2+ phosphor to partially or completely replace Rb+ allows the emission spectrum to be modulated from blue (λ = 473 nm, FWHM = 22.5 nm) to a narrow cyan band (λ = 485 nm, FWHM = 21.1 nm). As the K+ ion content increases, the space group of the phosphor evolves from I4/M to I41/A. The complete replacement of Rb+ by K+ results in the KNa3(Li3SiO4)4:Eu2+ cyan phosphor, which shows excellent thermal stability (the comprehensive emission loss is only 8% at 150 °C) and can be used to fill the cyan light gap in white LED devices. By adding the KNa3(Li3SiO4)4:Eu2+ cyan phosphor in packaging with yellow and red phosphors, the color rendering index is increased from 90.2 to 97.1 and the correlated color temperature improved to 3658 K. These results indicate that the cyan phosphor has important application value in full-spectrum white LEDs.
研究领域:
材料科学
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光学工程
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无机非金属材料
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发光材料
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半导体照明
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 18
·7333-7342
·
IF 4.569
Hua Yu,Liuyan Zhou,Renguang Ye,Degang Deng,Shiqing Xu
Polychromatic emission can be achieved by controlling the distribution of the rare earth activator in multi-cation lattices, which can be used in the fields of white light LED and fluorescence temperature sensing. However, it is still a challenge to control their distribution and location of the target site in a given host material because the distribution of the rare earth activator is uncertain. In this paper, we have chosen Li4SrCa(SiO4)2 as the multi-cation site host and induced the distribution of Eu2+ ions between different cation sites through anion substitution, for the first time, to regulate the luminescence characteristics of a series of Li4SrCaSi2O8−yN2y/3:Eu2+ phosphors. In Li4SrCa(SiO4)2:Eu2+ phosphors, the substitution of O2− by N3− triggered a distinct ordered to disordered structure transition of the SiO4 tetrahedron and induced the remote distribution of the Eu2+ activator, which was verified through the analysis of the XRD, EPR, FT-IR and fluorescence spectra. Due to the location of Eu2+ ions in different cation sites (Eu2+Sr and Eu2+Ca), two distinguishable emission peaks with tunable color emissions and different responses to temperature were realized. The white LED that utilized blue-orange-emitting Li4SrCaSi2O4N8/3:Eu2+ and green-emitting BaSi2O2N2:Eu2+ (500 nm) displayed an outstanding color rendering index (Ra) of 85.1. Based on the fluorescence intensity ratio (FIR) technique, an optical temperature measurement mechanism was hypothesized and studied in the temperature range of 293–473 K. The highest Sa of the material was 0.086 K−1, and Sr was 1.76% K−1 based on the FIR detection technology, revealing obviously better than most inorganic optical temperature-measuring materials reported before. Our work indicates that Li4SrCaSi2O8−2yN4y/3:Eu2+ is a promising material for application in White LEDs and optical thermometers.
研究领域:
材料科学
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发光材料
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无机化学
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光电子学
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传感器技术
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2017
·Vol. 32
·期 6
·957-963
·
IF 1.509
Jiao Xu,Yang Zhao,Jingjing Chen,Zhiyong Mao,Yanfang Yang,Dajian Wang
Two synthesis routes, solid-state reaction and precipitation reaction, were employed to prepare BaSiO 3 :Eu 2+ phosphors in this study. Discrepancies in the luminescence green emission at 505 nm for the solid-state reaction method sample and in the yellow emission at 570 nm for the sample prepared by the precipitation reaction method, were observed respectively. A detail investigation about the discrepant luminescence of BaSiO 3 :Eu 2+ phosphors was performed by evaluation of X-ray diffraction (XRD), photoluminescence (PL)/photoluminescence excitation (PLE), decay time and thermal quenching properties. The results showed that the yellow emission was generated from the BaSiO 3 :Eu 2+ phosphor, while the green emission was ascribed to a small amount of Ba 2 SiO 4 :Eu 2+ compound that was present in the solid-state reaction sample. This work clarifies the luminescence properties of Eu 2+ ions in BaSiO 3 and Ba 2 SiO 4 hosts.
研究领域:
材料科学
·
发光材料
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无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 10
·3522-3530
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IF 7.393
Zehua Liu,Pan Hu,Hangjie Jiang,Peng Sun,Yongfu Liu,Zhaohua Luo,Jingtao Xu,Zhengren Huang,Jun Jiang
Laser diode (LD) driven lighting is expected to be the next-generation lighting, and red CaAlSiN3:Eu2+ (CASN) phosphor is still required for high-quality LD white lighting. Utilizing glass with a suitable thermal expansion coefficient and low softening temperature as the inorganic binder, CASN phosphor-in-glass-films (PiFs) are fabricated in this work. High efficiency and thermal stability are achieved by optimizing the reaction of CASN and glass. Introducing Lu3Al5O12:Ce (LuAG) to offset the luminous spectra of CASN PiFs, broad emission spectra and high efficiency are recorded. High color rendering index (CRI, 88.6), luminous efficiency (LE, 153 lm W−1), and luminous flux (LF, 1162 lm) are achieved simultaneously when the PiFs are excited by a 455 nm blue LD. At last, the high color quality LD white lighting produced by PiFs is displayed for the first time. We believe that the results provided by this work are an enormous progress for PiFs and encourage more researchers to provide new strategies to acquire high performance of PiFs in white LD lighting.
研究领域:
光学材料
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固态照明
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光子学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shichang Xu,Yanjie Zhang,Xiuping Wu,Jinlong Wang,Bing Li,Jingjie Yu
The red@green core-shell emitting phosphor with monodisperse luminescence center was successfully constructed by Eu 2+ doped Sr 2 Si 5 N 8 and Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 via a deposition-precipitation (DP) method. Compared to traditional solid state reaction (SSR) method, under excitation at 370 nm, Sr 2 Si 5 N 8 :0.05Eu 2+ phosphor prepared by DP method exhibits red emission at 611 nm and an ~1.4-fold luminescent intensity enhancement. Interestingly, upon near-ultraviolet (NUV) excitation, Eu 2+ doped Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 phosphors prepared by DP method exhibit a dual emission feature with the green emission at 538 nm and red emission peak at 611 nm. The elemental line scanning spectrum of the energy dispersive X-ray analysis indicates a core@shell structure of Sr 2 Si 5 N 8 @SrSi 2 O 2 N 2 . Furthermore, this red@green core-shell emitting phosphor can be encapsulated in ultra-low melting Sn-F-P-O glass to achieve the white light with excellent color quality Ra = 85) and low correlated color temperature (4484 K) when pumped by near ultraviolet LED chips.
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高影响因子
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