JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Xiaopeng Hu,Anlin Zhang,Rong Tang,Xiaoyue Jin,Junzhi Che,Xuan Ouyang,Chang Zhou,Lianwu Xie,Bin Deng,Ruijin Yu
A series of reddish-orange emitting Ca 2 InNbO 6 :Sm 3+ (CINO:Sm 3+ ) phosphors for white light-emitting diodes (w-LEDs) were synthesized using a high-temperature solid-state technique. The synthesized CINO:Sm 3+ phosphors are pure phases with monoclinic structures. The optimal Sm 3+ doping concentration is 0.02 mol, and concentration quenching is due to the dipole-dipole interaction. Upon 407 nm excitation, the as-prepared CINO:Sm 3+ phosphors exhibited strong reddish-orange emission around 602 nm, attributed to the 4 G 5/2 → 6 H 7/2 transition of Sm 3+ . Surprisingly, the CINO:Sm 3+ phosphors revealed an abnormal thermal quenching (ATQ) phenomenon, and when the temperature of the phosphors was raised to 380 K, their emission intensity increased by more than 15%. The CINO:0.02Sm 3+ phosphor had a high color purity (98.9%) and reddish-orange chromaticity coordinates (0.608, 0.388). Meanwhile, the manufactured w-LED demonstrated a good color rendering index ( R a = 93), decent CCT (5752 K), and Commission International de l′Eclairage (CIE) chromaticity coordinates (0.327, 0.335). The experimental results demonstrated the superiority of the CINO:Sm 3+ phosphors in w-LEDs.
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
JOURNAL OF RARE EARTHS
·
2023
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IF 4.9
Xiaopeng Hu,Anlin Zhang,Yufeng Du,Li Zhou,Changlin Li,Jingjing Lian,Zhequan Zou,Xuan Ouyang,Bin Deng,Lianwu Xie,Ruijin Yu
A novel layered perovskite tantalate phosphor Sr 3 LaTa 3 O 12 :Sm 3+ (SLTO:Sm 3+ ) with orange-red emission was obtained for the first time via the solid-phase synthetic method. The phase purity, surface morphology , element distribution and luminescent properties of the SLTO: x Sm 3+ ( x = 0.01 mol%–0.30 mol%) phosphors were investigated. Under 408 nm excitation, the optimum doped SLTO:0.10Sm 3+ phosphor emits orange-red light at 598 nm with the highest emission peak ( 4 G 5/2 → 6 H 7/2 ). The critical energy transfer distance is 1.687 nm. The prepared SLTO:0.10Sm 3+ phosphor has excellent thermal stability with temperature quenching temperature ( T 0.5 > 500 K) and high activation energy ( E a = 0.25 eV). Through calculation, the chromaticity coordinates of all samples are concentrated in the orange-red area, and the color purity reaches 99%. The fabricated white light-emitting diode (w-LED) has a good correlated color temperature (5132 K), a high R a (89), and the CIE chromaticity coordinates (0.340, 0.327). Consequently, the superiority of orange-red-emitting tantalate SLTO:Sm 3+ phosphors for w-LEDs is demonstrated.
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
·
2023
·Vol. 11
·期 28
·9486-9494
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IF 6.4
Yixin Cai,Yang Yang,Haorui Dong,Tongtong Xuan,Xueyuan Tang,Rong-Jun Xie
Pure red mixed halide CsPbBr3−xIx perovskite nanocrystals (NCs) exhibit a high photoluminescence quantum yield (PLQY) and narrow full width at half maximum (FWHM), but there are phase stability issues that hinder their application in displays. In this work, we propose pure red CsPbBr0.96I2.04/SiO2 core/shell NCs by using (3-aminopropyl)triethoxysilane as the surface ligand and silicon source via a hot-injection and in situ hydrolytic process. The CsPbBr0.96I2.04/SiO2 NCs not only show excellent optical properties with a near-unity PLQY but also exhibit high stability against moisture, blue light, and heat. Pure red CsPbBr0.96I2.04/SiO2 NC inks were prepared by dispersing CsPbBr0.96I2.04/SiO2 NCs into a mixed solvent of toluene and dodecane and used to inkjet print NC color conversion films (NC-CCFs) with excellent luminescence uniformity and high stability. Finally, white-emitting Mini-LEDs were fabricated by combining pure red CsPbBr0.96I2.04/SiO2 NC-CCFs with green CsPbBr3/SiO2 NC-CCFs and blue Mini-LED chips, showing a high external quantum efficiency (EQE) of 24.8% and an ultrawide color gamut of 132.58% NTSC and 99.2% Rec. 2020 standards. This demonstrates the potential of pure red CsPbBr0.96I2.04/SiO2 NCs for Mini-LED backlights.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Songchao Bai,Hao Liang,Chao Li,Cunduo Tang,Gang Yang,Xiumei Xu,Xingqiang Yang,Gencai Pan,Yongsheng Zhu
Lead-free perovskites are a new type of luminescent material with non-toxic, stability and excellent photoelectric properties, which have great application in the field of photoelectric detection, solar cells, bio-imaging, etc. Here, we reported a new kind of uniform spherical rare-earth based double perovskite Cs 2 NaYCl 6 nanocrystals (NCs) as versatile hosts to accommodate ionic dopants for improving photoelectric properties especially the luminescent properties. In contrast to the low quantum yield of only 5.62%, the luminescent intensity of Cs 2 NaYCl 6 NCs can be impressively enhanced via doping Sb 3+ and Mn 2+ ions in the rare earth-based double perovskite lattices. For the Sb 3+ -doping, the photoluminescence quantum yield (PLQY) increases from 5.62% to 22.48%. On this basis, the luminescence colors can be tuned from blue to white and red via Mn 2+ ions doping and the maximum PLQY can be further improved to 38.66%. Finally, the Sb 3+ , Sb 3+ /Mn 2+ ions doped Cs 2 NaYCl 6 NCs based blue, red and white LEDs were explored, which indicates that these are potential materials in multicolor LEDs applications.
研究领域:
材料科学
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光电技术
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纳米技术
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光子学
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DOI
高影响因子
MICROELECTRONICS RELIABILITY
·
2023
·
IF 1.6
Meiling Xie,Minghao Fang,Zhaohui Huang,Yan'gai Liu,Xiaowen Wu,Xin Min
Na 3 Gd(PO 4 ) 2 phosphors doped with rare-earth metal ions Ce 3+ and Tb 3+ were fabricated by the solid-state reaction method. Under the excitation of 340 nm light, the Ce 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors exhibit a broad emission band ranging from 370 nm to 480 nm, which emitted blue light centered at 405 nm. When excited at 373 nm, the Tb 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors presented a green light emission, including a strong peak located at 547 nm. In addition, both of the Na 3 Gd(PO 4 ) 2 : Ce 3+ and Na 3 Gd(PO 4 ) 2 : Tb 3+ phosphors showed excellent thermal stability at different temperatures, be specific in the Na 3 Gd(PO 4 ) 2 : Ce 3+ emission intensities at 150 °C could maintain about 84 % and the Na 3 Gd(PO 4 ) 2 : Tb 3+ could maintain about 92.9 % of those at room temperature. A prototype of the white light-emitting diodes lamp exhibiting bright white light was fabricated by using a 365 nm near-ultraviolet-emitting LED chip, combined with Na 3 Gd(PO 4 ) 2 : Ce 3+ blue phosphors, Na 3 Gd(PO 4 ) 2 : Tb 3+ green phosphors, and Na 3 Gd(PO 4 ) 2 : Eu 3+ red phosphors , which produced a high color rendering index of 89.4, and a relatively low correlated color temperature of 5496 K. Moreover, the CIE point was calculated to be at (0.3332, 0.3438), locating in the white light region. These results indicate that the as-prepared phosphors can be considered as potential candidates for ultraviolet/near-ultraviolet light-excited white light-emitting diodes applications.
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
JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Nan Ma,Zongjie Zhang,Wei Li,Xiaoyong Huang
Bright cyan-emitting phosphor is indispensable to fill the cyan gap for the fabrication of full-visible-spectrum warm-white light-emitting diodes (LEDs) with high color rendering index (CRI). In this study, we demonstrate a novel efficient cyan-emitting Ce 3+ -activated CaLu 2 HfScAl 3 O 12 (CLHSA) garnet phosphor for application in blue-light-excited full-spectrum warm-white LEDs. CLHSA:Ce 3+ phosphors show broadband excitation spectra in the 300–470 nm spectral range with a maximum peak at 408 nm, indicating they can be efficiently pumped by the blue LED chips. The optimal doping concentration of Ce 3+ ions is found to be 1 mol%. Upon 408 nm excitation, the optimal CLHSA:1%Ce 3+ phosphor gives rise to a bright broadband cyan emission (peak position: 498 nm; bandwidth: 97.5 nm) with CIE chromaticity coordinates of (0.2196, 0.4265) and high photoluminescence quantum yield of 64.5%. Finally, we have fabricated a blue-light-excited high-CRI warm-white LED device by employing the CLHSA:1%Ce 3+ cyan phosphor, commercial YAG:Ce 3+ yellow phosphor and commercial CaAlSiN 3 :Eu 2+ red phosphor as well as a 450 nm LED chip, which demonstrates a bright warm-white light emission with a high CRI (Ra = 92.6), a low correlated color temperature (3660 K), and good CIE chromaticity coordinates of (0.3993, 0.3939) as well as a high luminous efficacy of 45 lmW −1 . Therefore, this newly discovered efficient cyan-emitting CLHSA:1%Ce 3+ phosphor is promising for application in blue-chip-pumped full-visible-spectrum warm-white LEDs with high CRI values.
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
ACS Nano
·
2024
·
IF 15.8
Wei Ling,Xue Shang,Chaonan Yu,Chenxi Li,Kedi Xu,Linqing Feng,Yina Wei,Tao Tang,Xian Huang
Continuously monitoring neurotransmitter dynamics can offer profound insights into neural mechanisms and the etiology of neurological diseases. Here, we present a miniaturized implantable fluorescence probe integrated with metal–organic frameworks (MOFs) for deep brain dopamine sensing. The probe is assembled from physically thinned light-emitting diodes (LEDs) and phototransistors, along with functional surface coatings, resulting in a total thickness of 120 μm. A fluorescent MOF that specifically binds dopamine is introduced, enabling a highly sensitive dopamine measurement with a detection limit of 79.9 nM. A compact wireless circuit weighing only 0.85 g is also developed and interfaced with the probe, which was later applied to continuously monitor real-time dopamine levels during deep brain stimulation in rats, providing critical information on neurotransmitter dynamics. Cytotoxicity tests and immunofluorescence analysis further suggest a favorable biocompatibility of the probe for implantable applications. This work presents fundamental principles and techniques for integrating fluorescent MOFs and flexible electronics for brain-computer interfaces and may provide more customized platforms for applications in neuroscience, disease tracing, and smart diagnostics.
研究领域:
神经科学
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生物医学工程
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材料科学
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电子学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 21
·34134-34144
·
IF 5.6
Fei Wang,Shiwei Zhang,Huiqing Jin
Mn 4+ has been widely used in the field of optical temperature measurement and plant growth illumination because of its special luminous properties. In this study, a series of novel red-emitting phosphors Ca 3 La 2- x W 2 O 12 : x Eu 3+ ,0.008Mn 4+ (CLWO: x Eu 3+ ,Mn 4+ ) (0≤ x ≤ 0.12, Δ x= 0.02) were successfully synthesized via a high-temperature solid-state method. Systematic investigations were conducted on the crystal structure, morphological characteristics, elemental distribution, luminescent properties, thermal stability, and electroluminescence spectra of CLWO:Eu 3+ ,Mn 4+ phosphor. The results demonstrate that CLWO:0.02Eu 3+ ,0.008Mn 4+ phosphor exhibits excellent optical temperature sensing performance (S a = 0.55 K -1 @433 K, S r = 3.21 %K −1 @423 K). Moreover, the electroluminescence spectrum of the LED device fabricated using CLWO:0.06Eu 3+ ,0.008Mn 4+ phosphor shows a high degree of spectral overlap with the absorption spectra of chlorophyll (B) and phytochromes (P r , P fr ), which are essential for plant growth. These findings strongly indicate that CLWO:Eu 3+ ,Mn 4+ phosphor holds significant potential for applications in both optical thermometry and plant growth lighting.
研究领域:
材料科学
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光学传感
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固态照明
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园艺照明
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发光材料
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
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IF 3.6
Junping Shi,Lielin Wang,Qibiao Wang,Chao Deng,Xiuqi Pu,Shidi Yao,Liang Jiang,Qiuyi Wang
Present study reveals the effects of varying concentrations of Pr 2 O 3 on the Spectral characteristics of 35PbO-60-xB 2 O 3 -5ZnO-xPr 2 O 3 (x = 0.5–3mol%) glasses, which were prepared using the melt-quench technique. The XRD and Raman results confirm that the glasses possessed the amorphous nature with borate complexes as the main structure units. From the absorption spectrum , the glass has a strong absorbance in the visible and infrared regions. The theoretical and experimental oscillator strengths ( f exp and f c a l ), phenomenological parameters (Ω 2 , Ω 4 , Ω 6 ) of Pr 3+ were calculated using the Judd-Ofelt theory. Strong emissions in the reddish orange region at 600 nm was observed due to the transitions of Pr 3+ ions from 1 D 2 → 3 H 4 at 444 nm excitation. The optimal concentration of Pr 2 O 3 in the glass is 1 mol%, exhibiting the highest photoluminescence intensity and the second longest decay time (microsecond order). The decay time reduction with increasing Pr 2 O 3 content, indicates the presence of resonant energy transfer between Pr 3+ ions. Therefore, the Pr 3+ -dope lead zinc borate glasses could be used for red LED.
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高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-8
·
IF 4.38
Chang Chao,Han Zhaoyang,He Xiaoyu,Wang Zongyu,Ji Yulong
As the electronic technology becomes increasingly integrated and miniaturized, thermal management has become a major challenge for electronic device applications. A heat pipe is a highly efficient two-phase heat transfer device. Due to its simple structure, high thermal conductivity and good temperature uniformity, it has been used in many different industrial fields. A novel aluminum flat heat pipe, with micro-grooves, has in the present work been designed and fabricated by using a 3D printing technology. Aluminum powder was used as a raw material, which was selectively melted and solidified to form the shape of the heat pipe. The sintered aluminum powder increased the roughness of the inner surface of the heat pipe, and the designed micro-grooves further enhanced the capillary forces induced by the wick structure. The wettability, for the working fluid (acetone), was excellent and the capillary forces were sufficient for the working fluid to flow back in the pipe. The effects of working fluid filling ratio, on the heat transfer performance of the heat pipe, was also investigated. It was shown that a filling ratio of 10% gave the best heat transfer performance with the lowest thermal resistance. The 3D-printed flat heat pipe was, therefore, also tested for the thermal management of a LED. The temperature of the LED could be kept within 40 °C and its service life became prolonged.
研究领域:
电子工程
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材料科学
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热能工程
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
MengDie Qin,Qin Fang,Kejun Tan
Biomass-derived white-light-emitting carbon dots (W-CDs) show significant promise for eco-friendly optoelectronic applications. Herein, W-CDs were synthesized via a one-step solvothermal method using renewable Lygodium japonicum as the carbon source and o -phenylenediamine as the nitrogen dopant, a sustainable and low-cost approach aligning with green chemistry principles. Under 380 nm ultraviolet excitation, the aqueous W-CDs solution emitted bright white light, with Commission International de l'Eclairage (CIE) coordinates of (0.29, 0.34) and a relative quantum yield of 3.09%. Notably, four distinct fluorescent components were successfully isolated by thin-layer chromatography (TLC) from this single biomass system: indigo blue (I-CDs, λ em = 410 nm), blue (B-CDs, λ em = 460 nm), green (G-CDs, λ em = 515 nm), and red (R-CDs, λ em = 670 nm). Comprehensive characterization (XPS, FT-IR, TEM, etc.) confirmed that the multicolor photoluminescence primarily originates from carbon core states, where increased sp 2 -conjugated domains and graphitic nitrogen content induce emission redshift. The separated multicolor CDs exhibit excellent photostability and tunable emission, while W-CDs enabled the fabrication of white light-emitting diodes (W-LEDs) with a correlated color temperature (CCT) of 7338 K. This study offers novel insights into the multifunctional utilization of biomass-derived carbon dots, highlighting their promising applications in solid-state lighting and information security.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Haiqi Wang,Jiejun Ren,Wanyi He,Lina Chen,Zhanhui Zhang
Developing high−performance, high stability, and environmentally friendly luminescent materials is crucial for advancing solid−state lighting technology. To replace toxic lead-based perovskites, this study focuses on lead−free manganese halide perovskite derivatives. Herein, we successfully synthesized bright green-emitting Cs 3 MnBr 5 (tetrahedral structure) and bright red-emitting CsMnBr 3 (octahedral structure) phosphors using a facile and eco-friendly aqueous solution method. To overcome their intrinsic concentration quenching effect and enhance overall performance, Mg 2 + ions were innovatively introduced as dopants. After Mg 2+ doping, the Cs–Mn–Br perovskite materials exhibited significant improvements in both luminescence performance and stability. Their photoluminescence (PL) intensity increased to approximately 130 % of their initial intensity, and the photoluminescence quantum yield (PLQY) of Cs 3 MnBr 5 improved from 52 % to 62 %. For CsMnBr 3 , the PLQY increased from 11.4 % to 17.5 %, the PL intensity was improved by 27 %. Under ambient conditions, the doped Cs 3 MnBr 5 maintained strong luminescence intensity even after 48 h, demonstrating far superior stability compared to the undoped sample. Systematic research has shown that moderate Mg 2+ doping (7.5 % in Cs 3 MnBr 5 and 8 % in CsMnBr 3 ) can reduce the Mn 2+ concentration quenching effect and significantly optimized the optical properties of the material. Application in light-emitting diodes (LED) further demonstrates the potential of Cs–Mn–Br perovskite materials in the field of luminescence. This work not only achieves a synergistic improvement in manganese halide perovskites through a simple ion doping strategy, but also lays a solid foundation for its practical application in environmentally friendly optoelectronic devices.
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高影响因子
危险品化学品经营许可证（带存储）