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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DOI
高影响因子
CRYSTENGCOMM
·
2026
·
IF 2.6
Jiaqi Zhang,Zhiyu Qin,Langping Dong,Baiqi Shao,Jingshan Hou,Yongzheng Fang
A novel green-emitting phosphor, Ca2HfSi4O12:Ce3+, Tb3+ (CHSO:Ce3+, Tb3+), was successfully fabricated via a conventional solid-state reaction under high-temperature conditions. The phosphor shows two broad excitation bands (200-400 nm), which can be attributed to the characteristic 4f → 5d electronic transitions of Ce3+ ions. As an efficient sensitizer, Ce3+ transfers absorbed ultraviolet energy to Tb3+ ions, resulting in a strong green luminescence peaking at 543 nm when excited at 330 nm. The optimized composition, CHSO:0.02Ce3+, 0.035Tb3+, exhibits a high internal quantum efficiency (IQE) of 88.65% and an external quantum efficiency (EQE) of 54.0% under 330 nm excitation, together with excellent luminous thermal stability, maintaining 90% of its emission intensity at 393 K. White light-emitting diodes (WLEDs) were assembled using CHSO:Ce3+,Tb3+ in conjunction with a 310 nm UV chip and commercial blue BaMgAl10O17:Eu2+ and red (Ca, Sr)AlSiN3:Eu2+ phosphors, yielding a high color rendering index (Ra = 90.2) and a correlated color temperature of 5157 K. These findings highlight CHSO:Ce3+, Tb3+ as an efficient and thermally stable green phosphor with significant potential for UV-pumped WLED applications.
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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
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yongsheng Yang,Siyuan Tang,Da Chen,Changxing Wang,Bingli Gu,Xiameng Li,Feng Xie,Gang Wang,Qinglei Guo
In this study, red-emission graphene quantum dots (R-GQDs), with tunable emission wavelength , are synthesized and explored for applications in trace water sensing, white light emitting diodes (WLEDs) and information encryption . Systematic experiments and characterizations demonstrate that the as-fabricated R-GQDs possess homogeneous size, good crystallinity and high doping concentration of nitrogen and oxygen. Moreover, tunable multicolor light emissions of R-GQDs are demonstrated by simply adjusting the polarity of surrounding solvents. As a result, solid-state fluorescence films are successfully fabricated to construct a high-quality WLED, with the CIE (Commission International d′Eclairage) coordinates (0.352, 0.380) and color temperature of 5121 K. Besides, the water quenchable fluorescence of R-GQDs enables the fabrication of a trace water sensing platform, with the low detection limit of 0.034%. Finally, the potential of our prepared R-GQDs for the application in color visual information encryption is developed. This study may pave the way for the development of GQDs, especially in optically sensing, optoelectronics and anti-counterfeiting technology.
研究领域:
纳米材料学
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光学传感
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光电子学
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分析化学
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防伪技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Hong Li,Junfeng Zheng,Binghan Liu,Mengying Suo,Mochou Fu,Yaowei Pang,Xiangting Zhang,Yanpeng Dai
The pursuit of full-spectrum white light-emitting diodes (WLEDs) with high color rendering is often hampered by the “cyan gap”, a spectral deficiency that compromises light quality. Herein, we narrow this gap by developing a novel yellow-green-emitting Y 2- x CaScAl 3 SiO 12 :0.06Ce 3+ (YCSASO:0.06Ce 3+ ) garnet phosphor. A series of YCSASO: x Ce 3+ ( x = 0.01-0.16) garnet phosphors is synthesized and systematically studied. Structural analysis confirms that all phosphors crystallize in a pure cubic garnet structure, with Ce 3+ ions occupying the dodecahedral sites of Y 3+ and leading to a slight lattice expansion. Upon 450 nm excitation, the YCSASO: x Ce 3+ phosphors exhibit a wide asymmetric band characteristic of the Ce 3+ emission (5d 1 →4f). The tunability of the emission color across the green-to-yellow region is achieved through variation of Ce 3+ concentration, because of enhanced crystal field splitting and resonant energy transfer. YCSASO:0.06Ce 3+ as the optimal composition effectively narrows the cyan gap, exhibiting a broad emission band centered at 549 nm with a full width at half maximum (FWHM) of 124 nm, an internal quantum efficiency (IQE) of 56.3%, and an external quantum efficiency (EQE) of 28.4%. First-principles calculations indicate that incorporating Ce 3+ 5d states narrows the host bandgap, facilitating efficient electron transitions. This phosphor achieves stable thermal performance by maintaining 59% of its initial intensity at 423 K and remarkable color stability with a chromaticity shift as low as Δ E = 5.1 × 10 −3 . A prototype WLED based on this yellow-green phosphor, a 455 nm blue LED chip, and a red-emitting CaAlSiN 3 :Eu 2+ phosphor maintains excellent stability for at least 12 h and generates high-quality warm white light, achieving a color rendering index (Ra = 92.2), a correlated color temperature (CCT = 3490 K), and a luminous efficacy of 52.6 lm/W. This work validates the strategic use of the yellow-green YCSASO:0.06Ce 3+ phosphor to narrow the cyan gap, paving the way for advanced full-spectrum lighting.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Kang Wang,Chenjun Pan,Zhanghai Tian,Can Yuan,Yu Li,Huangyao Chen,Ruirui Cui,Xiang Guo
A novel class of orange-red emitting Lu 2 SrAl 4 SiO 12 : x Sm 3+ phosphors was synthesized via a high-temperature solid-state reaction. Rietveld refinement confirmed that Sm3+ dopants successfully substitute Lu 3+ sites within the cubic garnet matrix. Under 405 nm near-ultraviolet excitation, the phosphors exhibit intense orange-red emissions, with the dominant peak at 618 nm originating from the 4 G 5/2 → 6 H 7/2 transition. Investigations reveal that the maximum luminescence output is achieved at a doping level of x = 0.03. Beyond this point, the concentration quenching process is dominated by dipole-dipole interactions, with the critical energy transfer distance calculated to be 18.88 Å. The optimized phosphor ( x = 0.03) exhibits an internal quantum efficiency of 16.7% and a fluorescence lifetime of 2.16 ms. It demonstrates robust thermal stability, retaining 68% of its initial intensity at 423 K. The activation energy governing this thermal quenching process is determined to be 0.187 eV. All single-doped samples exhibit ultra-high color purity exceeding 98.4%. By blending the Lu 2 SrAl 4 SiO 12 :0.03Sm 3+ phosphor with commercial blue/green phosphors on a 405 nm n-UV chip, a high-performance white light-emitting diodes device were fabricated, achieving a warm correlated color temperature of 4318 K and a high color rendering index of 84.53. Furthermore, its successful application as security inks across diverse substrates confirms Lu 2 SrAl 4 SiO 12 :0.03Sm 3+ as a highly promising dual-functional material for advanced solid-state lighting and optical anti-counterfeiting.
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yougui Yang,Yan Chen,Junhao Li,Ling He,Meng Wu,Qi Wang,Yong Yang,Zhangwen Long,Yuan Gao,Dacheng Zhou,Jianbei Qiu
All-inorganic perovskite quantum dots (QDs) in glass materials , specifically CsPbX 3 (X = Cl, Br, I), are being considered as the next-generation fluorescent materials due to their impressive luminous performance and stability. However, the crystallization process of quantum dots within the glass presents uncontrollable challenge, leading to uneven crystallinity and subsequent reductions in light efficiency, thereby affecting practical applications. In glass ceramics doped with rare-earth oxides , the introduction of rare-earth ions as nucleating agents can promote the self-precipitation of nanocrystalline crystals within the glass. Building upon this principle, we have doped rare-earth ions into borosilicate glass for the first time to induce the self-crystallization of CsPbBr 3 QDs. This approach effectively enhances the equilibrium distribution of quantum dots within the glass, resulting in a significant improvement in luminosity. Furthermore, the luminescence spectrum range of quantum dot-shaped luminescent glass materials can be finely tuned through rare-earth ion doping. This finding holds both theoretical and practical significance for their application in the field of lighting.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Meiting Li,Bingxin Yuan,Xiangyang Zheng,Bo Chen,Chi Zhang,Xuejiao Wang,Ji-Guang Li
A series of LaNbO 4 :RE 3+ (RE = Tb and Eu) phosphors were successfully synthesized via a calcination-assisted hydrothermal reaction, where the vital roles of solution pH, calcination temperature and NbO 4 3− /La 3+ molar ratio in phase/morphology evolution of LaNbO 4 nanocrystals were elaborated. It was unambiguously demonstrated that monoclinic LaNbO 4 can be crystallized at solution pH = 8–13 after calcination at 900 °C. With pH = 10 precursor for example, higher calcination temperature led to phase transformation from orthorhombic to monoclinic structure. LaNbO 4 nanoparticles exhibit self-activated broad-band excitations ( 1 A 1 → 1 T 1,2 ) and emissions ( 3 T 2,1 → 1 A 1 ) within the NbO 4 3− ligand. Intriguingly, Tb 3+ /Eu 3+ incorporations allow for phase tailoring and full-visible-spectrum color-tunable luminescence, where the latter benefits from the effective NbO 4 3− → Tb 3+ → Eu 3+ energy transfer. LaNbO 4 :0.01 Tb 3+ ,0.01Eu 3+ phosphor exhibits stronger white-light emission, which gradually drifts to yellowish green at high heating temperature. This phosphor is an attractive candidate for optical thermometers and warm pc-WLED owning to excellent thermal stability, a low correlated color temperature of ∼5694 K and a high color rendering index of ∼90.
研究领域:
材料科学
·
光学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu He,Zongqing Jin,Guanjun Xiao,Bo Zou,Qingqin Ge,Nannan Shi,Liwei Jiang,Cheng Sun,Tao Xiong,Yinan Zhang
To circumvent the toxicity problem of lead, looking out for lead-free perovskites with a broadband emission and associated LEDs that cover the full region of white light is the key to research in sustainable chemistry and material community. In order to improve the luminescence properties of inorganic lead-free perovskites, chemical doping engineering is utilized. We have found that yttrium plays an important role as a dopant in broadening the emission of inorganic perovskites. This work reports on white light emission in a yttrium-doped tin perovskite and the white LED synthesized with this eco-friendly phosphor. The hue of the light can be adjusted via the change in the excitation wavelength. DFT is performed to calculate the band gaps, and a good agreement with the experimental results is illustrated. The dramatic fluorescence enhancement (by a factor of about 4.5) is also revealed on the phosphor. Based on this sustainable material, a WLED is fabricated, and a full-color white light emission is realized with a CIE of (0.32, 0.33). This work not only provides us with an inorganic phosphor for white LEDs but also demonstrates the potential of the chemical doping strategy in sustainable chemistry and materials science.
研究领域:
材料科学
·
化学工程
·
光学工程
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 10
·2060-2071
·
IF 5.958
Lei Qiu,Hang Yang,Zhigao Dai,Fengxu Sun,Jiarui Hao,Mengyu Guan,Peipei Dang,Chunjie Yan,Jun Lin,Guogang Li
Poor stability of CsPbX3 (X = Cl, Br or I) perovskite quantum dots (QDs) has greatly hindered their practical photoelectric applications, and how to improve it still remains a critical challenge. Herein, we encapsulated CsPbBr3 QDs into dual-shell hollow silica (SiO2) spheres via a simple successive ionic layer adsorption and reaction (SILAR) method. The hierarchical dual-shell structures permit CsPbBr3 QDs to be anchored on the interior of the SiO2 spheres while keeping the outside surface undisturbed, which can protect the CsPbBr3 QDs from direct exposure to the atmosphere. Due to the comprehensive protection of dual-shell hollow SiO2 spheres, the CsPbBr3/SiO2 nanospheres exhibit markedly enhanced stability against light and heat, with a residual PL intensity of 89% after continuous exposure for 72 h to UV light and 65% after 100 °C heat treatment, respectively. In addition, an optimal PLQY of 89% is obtained with suppressed nonradiative recombination. Finally, the fabricated white light-emitting diode (LED) device by employing CsPbBr3/SiO2 green phosphors could achieve a wide color gamut covering up to 136% of the NTSC standard. This work provides a novel SiO2-based encapsulation approach to solve the intrinsic instability issues of CsPbBr3 QDs, which has a profound impact on their practical applications.
研究领域:
材料科学
·
纳米技术
·
光电技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fan Guo,Rui Yuan,Yun-Ling Yang,Jing-Tai Zhao,Hui Lin,Zhi-Jun Zhang
Phosphor-in-glass (PiG) is one of the most important spectral converters to overcome thermal effect in high-power white light-emitting diodes (LEDs). The Al 2 O 3 –SiO 2 –B 2 O 3 –ZnO–Na 2 O–Li 2 O glass was designed and sintered with Y 3 Al 5 O 12 :Ce 3+ (YAG: Ce) phosphors at the low temperature of 650 °C to obtain YAG: Ce-PiG. The optimized YAG: Ce-PiG shows the white light of the luminous efficiency (LE), correlated color temperature (CCT) and chromaticity coordinate (CIE) of 177.5 lm/W, 6410 K and (0.31,0.34), respectively. The white LEDs (WLED) were fabricated by coupling the YAG: Ce-PiG with a blue light emitting chip, and the correlation between the luminescence properties , the thickness of PiG and the ratio of phosphors was investigated. More importantly, the WLEDs of a maximum luminous efficiency can reach up to 199.5 lm/W with the thickness of 0.35 mm. In addition, a structure with vacuum packaging technique based on the WLEDs lighting combined with sapphire as substrate was fabricated, which can effectively reduce the heat accumulation during the working process of WLEDs. Compared with normal non-vacuum packaging, the working temperature of WLEDs was reduced by about 35%, from 359.2 to 232.2 °C, with the novel vacuum packaging technique under 30W high-power chip and the luminous performance can still be maintained at 94.7%. In a word, the prepared YAG: Ce-PiG exhibits a great potential for application in high-power solid-state WLEDs.
研究领域:
光学
·
材料科学
·
电子工程
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Huimin Li,Ran Pang,Guanyu Liu,Wenzhi Sun,Da Li,Lihong Jiang,Su Zhang,Chengyu Li,Jing Feng,Hongjie Zhang
In this article we synthesized a series of phosphors K2MgGeO4:Bi3+ with high brightness for white light-emitting diodes (WLEDs) conversion and investigated their crystal structures and luminescence properties using powder X-ray diffraction, diffuse reflectance spectra, X-ray photoelectron spectroscopy, photoluminescence spectra, and absolute quantum efficiency. K2MgGeO4:Bi3+ phosphor exhibits intense absorption in near-UV area and presents a broad asymmetric emission band with the main peak located at 614 nm, which was ascribed to the 3P1 → 1S0 transition of Bi3+. The absolute quantum efficiency of the K2MgGeO4:0.01Bi3+ phosphor was measured to be 66.6%. Also, this orange emission with color chromaticity coordinates of (0.4989, 0.4400) has an excellent resistance to thermal quenching: its integrated intensity at 393 K still maintained ∼85% of the one at room temperature. The WLEDs devices with Ra = 93.8 were fabricated by employing K2MgGeO4:0.01Bi3+ as an orange phosphor, which contains abundant red light component in its emission spectrum. The excellent luminescent performance of K2MgGeO4:0.01Bi3+ suggests that it is a promising orange-emitting phosphor for near-ultraviolet WLEDs.
研究领域:
材料科学
·
光学材料
·
固态照明
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荧光粉化学
·
发光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）