JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Reziwanguli Yantake,Aierken Sidike,Taximaiti Yusufu
This study presents the photoluminescence characteristic analysis of a series of red phosphors of KAlSiO 4 :1.5 mol%Sm 3+ , x mol%Eu 3+ ( x = 2, 3, 4, 5, 6, 7) prepared via high-temperature solid-phase reaction. The results show that the X-ray diffraction (XRD) refinement results are reliable. The unit cell parameters and volume gradually decrease as the Eu 3+ concentration increases, resulting in a grain size reduction of 10.22%. When x = 6, the emission peaks of Sm 3+ at 564, 601, and 651 nm disappear completely, and the corresponding full width at half maximum becomes 0. At 610 nm, the emission peak intensity of Eu 3+ is increased by a factor of 4.8. The resonant non-radiative energy transfer effect is greater than the co-excitation effect. A maximum energy transfer efficiency of 97.8% is achieved. The integral area at 610 nm is as high as 85%. The color purity of the phosphor is as high as 92.97%, and the internal quantum yield gradually changes from 32% to 51%. Ultimately, these results confirm that the silicate phosphor is suitable for the red component in the three primary color phosphors of white light-emitting diodes.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-9
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IF 2.8
Xiong Lu,Hu Haisheng,Liu Meitang,Zhang Chongji
Upconversion materials have significant application prospects in many fields due to the advantages of being excited by infrared light. However, the development of upconversion materials is constrained by low upconversion efficiency and low luminescence intensity. The aim of this work is to improve the luminescence efficiency and intensity of fluorine-based upconversion luminescent materials through ternary alkali metal doping. A series of ternary alkali metal-doped Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ novel upconversion luminescent materials were synthesized by a one-step facile hydrothermal method, and their mechanisms were explored. The results show that the doping of Li, Na, and K ions changes the crystal structure of Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ , thereby affecting the spatial structural relationship between the rare-earth ions, which changes the energy transfer efficiency to them. The luminescence intensity of the prepared Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ was 30 times higher than that of the undoped samples when doped with Li, Na, and K ions in a molar ratio of 10:6:9. This study provides a simple and effective method for the preparation of upconversion materials with excellent luminescent properties.
研究领域:
材料科学
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光学
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 44
·11620-11630
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IF 5.256
Dan Liu,Yin-Ning Zhou,Jilian Zhao,Yaling Xu,Jingfei Shen,Minggang Wu
The main challenge in the development of luminescent lanthanide complexes lies in the design of organic ligands. Herein, a carboxyl-terminated aromatic hyperbranched polyester (CHBPE) ligand was designed and synthesized, which has abundant branched end groups for chelating lanthanide ions, strong light-harvesting ability in the UV region, and more importantly, good energy match with the Tb3+ ion. The structure of CHBPE was characterized by MALDI-TOF MS, elemental analysis, FTIR, 1H NMR, 13C NMR, and UV-Vis absorption measurements. Subsequently, a Tb3+ complex (CHBPE-Tb3+-Phen) based on CHBPE was obtained, in which Phen was used as a co-ligand to protect Tb3+ ions and reduce non-radiative transition of Tb3+ ions. The as-prepared complex was analyzed by MALDI-TOF MS, elemental analysis, 13C NMR, FTIR and UV-Vis methods. The results demonstrated that both CHBPE and Phen coordinated to Tb3+ ions and a stable chelate structure was formed. The synergistic effect of CHBPE and Phen made the complex exhibit remarkably strong green luminescence corresponding to the Tb3+ ion upon UV excitation. The efficiency of energy transfer (Φsen) from the CHBPE to Tb3+ ion was 55.2%, revealing that CHBPE is well suitable for the sensitization of Tb3+ ions. The absolute quantum efficiency (Φoverall) and luminescence lifetime (τobs) of the complex were 27.5% and 0.28 ms, respectively. The possible energy transfer pathways in the complex system were proposed. The complex is expected to have potential application in the near ultraviolet light emitting diode (NUV-LED).
研究领域:
材料科学
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光化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·12915-12921
·
IF 6.4
Haolin Yang,Anshuo Zhang,Hai Guo,Denghao Li,Shiqing Xu,Lei Lei
Upconversion (UC) nanoparticles (NPs) have gained significant attention in many fields, such as super resolution nanoscopy and background-free bioimaging. UC efficiency is one of the most important parameters in these practical applications. However, enhancing the UC efficiency of core-only NPs synthesized in a single step, without the need for additional post-processing, has remained a great challenge. In this study, we propose an effective strategy for significantly enhancing the UC intensity by constructing local energy clusters within the lanthanide-doped fluoride NPs. By introducing local energy clusters within the NaGdF4 crystal lattice, the optimal Er3+, Ho3+ and Tm3+ doping concentrations were increased to 8 mol%, 8 mol%, and 2 mol%, respectively. The UC intensity of the 20Yb/8Er/20Ca:NaGdF4 NPs is approximately 54.3 times higher than that of typical 20Yb/2Er:NaGdF4 NPs, which is attributed to the increased energy transfer efficiency from Yb3+ to Er3+ and the reduced energy loss caused by surface vibrations. Moreover, with the formation of energy clusters within the crystal lattice, the temperature-dependent UC intensity behavior shifted from a negative thermal quenching effect to a positive thermal quenching effect, which results in enhanced temperature sensing performance. The violet UC from Tm3+ activators was significantly enhanced through the energy clusters, which facilitates the noticeable inter-particle energy migration UC of Tb3+ ions. Overall, our study presents a novel approach to significantly enhance the optimal doping concentrations of lanthanide activators and the UC intensities of NPs. These findings open up exciting opportunities for the development of high-performance UCNPs with improved applications in various fields.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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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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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiamiao Yin,Qianwen Zhou,Yanzhong Li,Donghao Hu,Ming Xu,Mei Shi,Weigang Yan,Qingbing Wang,Xiufeng Hou,Fuyou Li
Photochemical reaction-based afterglow materials offer a promising solution to the tissue autofluorescence issues associated with real-time excitation in traditional fluorescence probes. Conventional photochemical afterglow systems typically consist of three components: a photosensitizer, an energy cache unit (ECU), and an emitter. However, their physical separation leads to inefficient energy transfer. We present a strategy for constructing an “all-in-one” afterglow nanoplatform (AGNP) based on perovskite quantum dots (PQDs) to enhance the energy transfer efficiency by minimizing physical separation. Modified with 1-pyrenecarboxylic acid (PCA), CsPbBr3 PQDs can serve as a photosensitizer, emitter, and ECU–phenylacetic acid (ECU–COOH) host simultaneously. The afterglow intensity of the AGNP shows a remarkable 30-fold enhancement compared with the separated ECU afterglow system, attributed to the decreased energy transfer distance. The AGNP also exhibits great versatility, enabling tunable afterglow emission across the visible region. The AGNP is further adopted for in vivo afterglow imaging with a signal-to-noise ratio of 41. This work provides an idea for constructing “all-in-one” afterglow systems and demonstrates their potential for background-free bioimaging.
研究领域:
材料科学
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生物医学工程
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光学成像
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1216-1229
·
IF 4.186
Guangtao Lu,Yichao Wang,Siqi Piao,Jinsu Zhang,Xizhen Zhang,Xufeng Zhou,Yongze Cao,Xiangping Li,Baojiu Chen
The excellent narrow-band emitters, especially the green ones, are regarded as a pivotal research direction for light-emitting diodes (LED) backlights in liquid-crystal displays (LCDs). A nearly single-peak green emission centered at 513 nm with a full width at half maximum of 28 nm is reached in KAl 11 O 17 :0.1Eu 2+ , 0.15Mn 2+ phosphor via nearly 100% energy transfer (ET) efficiency, and the extended X-ray absorption fine structure analysis elucidates its mechanism, which is that Eu 2+ and Mn 2+ are constrained to form Eu 2+ –Mn 2+ pairs with a small distance 3.7 Å caused by the local environment relaxation inducement. Meanwhile, by creating an unhindered energy flow between Eu 2+ , Mn 2+ and K + /O 2− defect levels through ET and multilevel electron trapped and recombination process, the KAO:Eu 2+ , Mn 2+ phosphors perform superb photoluminescence property with a high color purity of 83%, an excellent thermal stability (94%@200°C), and unexceptionable internal and external quantum efficiencies of 91.7% and 66.4%, which all are superior to characteristics of commercial β-SiAlON:Eu 2+ phosphor. Moreover, the white LED fabricated using KAO:Eu 2+ , Mn 2+ to provide green component shows a wide color gamut of 105% National Television System Committee. These results indicate a potential for an application of our material in LCD–LED backlights, and the design of such local relaxation-induced structure provides a significative reference to develop the new narrow-band emitters.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guoxiang Song,Chaogang Lou,Bowen Shen,Zi Wang,Ruiqi Zhu
We achieved a quantum cutting process in Pr 3+ -Yb 3+ co-doped CaF 2 that converts one visible photon into two near-infrared photons matching the silicon band gap. In this study, the quantum cutting process between Pr 3+ and Yb 3+ was experimentally verified through comparative analysis of the normalized absorption spectrum of Pr 3+ and the near-infrared excitation spectrum of Yb 3+ . Fluorescence lifetime measurements at the optimal doping concentration revealed an energy transfer efficiency of 60.99% from Pr 3+ to Yb 3+ . Temperature-dependent luminescence spectroscopy further estimated the luminescence efficiencies as 64.49% (Pr 3+ ) and 71.41% (Yb 3+ ). Based on these results, the theoretical quantum efficiency of the Pr 3+ →Yb 3+ system was obtained to be about 112.26%, confirming the occurrence of efficient photon down-conversion. Considering the limited energy gain from sunlight due to the narrow-band absorption of Pr 3+ by f-f forbidden transition, Eu 2+ ions were employed to perform broadband sensitization on the quantum cutting process of Pr 3+ -Yb 3+ . Studies have suggested that the incorporation of Eu 2+ can effectively assimilate the 250-400 nm band and transfer energy to Pr 3+ and Yb 3+ , causing them to emit stronger near-infrared spectra. These developed materials are capable of converting ultraviolet-visible photons into near-infrared photons matching the silicon bandgap, which reduces energy loss caused by spectral mismatch and has promising applications in silicon-based photovoltaics.
研究领域:
材料科学
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光子学
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无机非金属材料
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能源材料
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固体发光
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 26
·47599-47610
·
IF 5.6
Weijie Zhu,Weichao Wang
The rapid expansion of data-intensive technologies such as 5G, AI, and cloud computing is pushing optical communication systems to their limits, necessitating the development of advanced materials to extend bandwidth into the L- and U-bands. Fluoro-sulfo-phosphate (FSP) glasses, owing to their multi-anionic compositions and tunable network structures, offer a promising platform for next-generation broadband fiber amplifiers. In this work, a mixed-cation approach employing K + and Ba 2+ is employed to manipulate the local structural environment and enhance glass-forming ability, lifetime (8.7–9.22 ms for Er-doped, ∼10 ms for Er 3 + /Yb 3+ co-doped), emission cross-section (0.59-0.70 × 10 − 20 cm 2 ), energy transfer efficiency (∼85 %), and thermal quenching resistance. Despite their similar sizes and electronegativities, K + and Ba 2+ exhibit contrasting field strengths and polarizabilities, enabling a controlled balance between network connectivity and local disorder. Thermodynamic modeling and experimental results confirm that the introduction of mixed cations significantly broadens the glass-forming region. The addition of AlF 3 further strengthens the network, allowing for the preparation of stable K/Ba-FSP glasses with improved mechanical, thermal, and chemical properties. Spectroscopic analysis reveals a substantial enhancement in L-band emission efficiency and gain characteristics, with performance improvements ranging from 30 % to 150 % over conventional glass hosts. These findings position K/Ba-FSP glasses as a robust and high-performance candidate material system for broadband rare-earth-doped fiber amplifiers and lasers.
研究领域:
材料科学
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光学工程
·
无机非金属材料
·
光通信
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 5
·1-10
·
IF 2.8
Ye Huihua,Lin Jinfeng,Wang Xusheng
Three types of CaAl 2 O 4 :Li + phosphors singly doped with Eu 3+ , Sm 3+ , and Ho 3+ ions were synthesized using high temperature solid-state reaction method, and the effects of rare-earth ions and doping concentration on the crystal structure, thermal stability and luminescence properties were systematically studied. The XRD patterns show that all Ca 1 − x Al 2 O 4 :0.01Li + , x Re 3+ (Re = Eu, Sm, Ho) phosphors are pure monoclinic CaAl 2 O 4 phase. And these phosphors can be effectively excited by the characteristic excitation wavelength of the corresponding rare earth ions. Notably, when the doping concentration is less than 15 mol%, the corresponding luminous intensity increases monotonically with the increase of Ho 3+ , while the optimal doping amounts for Eu 3+ and Sm 3+ are 9 mol% and 1 mol%, respectively. Additionally, comparative analysis revealed superior energy transfer efficiency from the matrix to the luminescent center in the CaAl 2 O 4 :0.01Li + , Eu 3+ relative to Sm 3+ and Ho 3+ counterparts. More importantly, the Ca 0.91 Al 2 O 4 :0.01Li + , 0.09Eu 3+ phosphors also exhibit excellent thermal and ageing stability. Its luminous intensity exhibited minimal deviation (< 16%) across an extended temperature range (208 ~ 448 K). Furthermore, after 320 h of thermal aging at 100 °C, the sample retained over 98% of its initial fluorescence intensity. This study provides theoretical and experimental basis for the development of CaAl 2 O 4 -based phosphors for solid-state lighting devices.
研究领域:
材料科学
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光电子学
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固态照明
·
无机化学
·
应用物理学
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DOI
高影响因子
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