CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongxiang Shao,Xianju Zhou,Faling Ling,Li Li,Yongjie Wang,Jingfang Li,Ruiheng Pan,Hongmei Yang,Guangxin Xie
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have become important as new NIR light sources in NIR spectroscopy and NIR imaging techniques . However, currently developed broadband NIR phosphors commonly suffer from weak emission and poor thermal stability. In this work, a series of Gd 3 Lu 2 Ga 3 O 12 : Cr 3+ phosphors were synthesized via high-temperature solid-state reaction. Under 460 nm excitation, the phosphors exhibit an intense emission spanning from 650 to 1150 nm with a full width at half maximum (FWHM) of 122 nm. After introducing Yb 3+ as a co-dopant, the emission of the phosphor has been broadened greatly. Interestingly, the studied phosphors demonstrate super high thermal stability in a wide temperature range of 35–560 K, with the integrated emission intensity fluctuating within 10 %. At 435 K, the emission intensity of Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ remains 99.5 % and Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ , 0.01 Yb 3+ keeps 102.7 % of the initial intensity at room temperature. These NIR phosphors have been encapsulated with a common commercial 460 nm blue LED chip to fabricate a pc-LED device. The NIR output power of the device reaches 23.93 mW@100 mA, with a photoelectric conversion efficiency of 9.81 % at 20 mA current. The applications of the prepared NIR light source in night vision, and bioimaging have been demonstrated. The results show that these Cr 3+ /Yb 3+ doped garnet phosphors can be effectively used in NIR light sources .
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2025
·
IF 3.4
Ping Wang,Bin Duan,Yuanyuan Fan,Min Luo,Liming Tang,Changchun Ding,Tong Liu,Wei Jin,Junshan Hu
A novel upconversion phosphor, Ca 3 (VO 4 ) 2 co-doped with Yb 3+ and Er 3+ , was successfully synthesized via a high-temperature solid-state method. Under 980 nm near-infrared excitation, this material exhibits remarkable upconversion luminescence, with intense green emissions at 527 nm and 550 nm, and a weaker red emission at 657 nm. The optimal doping concentrations were determined to be 0.03 for Yb 3+ and 0.005 for Er 3+ , enabling maximum luminescent efficiency. Spectroscopic investigations including upconversion photoluminescence, excitation, and emission spectra confirmed that the upconversion follows a distinct energy transfer mechanism: Yb 3+ ( 2 F 5/2 ) + Er 3+ ( 4 I 11/2 ) → Yb 3+ ( 2 F 7/2 ) + Er 3+ ( 4 F 7/2 ). In addition to its excellent luminescent properties, the Ca 3 (VO 4 ) 2 : 0.03Yb 3+ /0.005Er 3+ phosphor exhibits reliable optical thermal sensitivity over a wide temperature range (298–673 K), with a peak relative sensitivity of 1.11 % K −1 at 298 K. These outstanding optical characteristics make Ca 3 (VO 4 ) 2 : 0.03Yb 3+ /0.005Er 3+ a promising candidate for display and lighting technologies.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Bo Liu,You Li,Sai Xu,Jianglong Chang,Yuefeng Gao,Hongquan Yu,Yichao Wang,Baojiu Chen
Lead-free double perovskite (DP) materials have garnered growing interest because of their outstanding optoelectronic attributes. Nevertheless, realizing efficient, multimodal photoluminescence (PL) with adjustable emission spectra within single-host DP materials still poses a formidable hurdle. Herein, Er-based lead-free DPs (Cs2NaErCl6) were developed, which achieves downshift (DS) emissions from visible to near-infrared (NIR) and multicolor upconversion (UC) emissions, resulting from the abundant energy levels of Er3+ ions. Alloying with Yb3+ introduces new Yb3+-Er3+ cross-relaxation (CR) pathways, leading to a 308.5-fold increase in DS red emission and achieving a maximum color purity of 98.63%. Additionally, Yb3+ alloying enhances UC luminescence by 10.8-fold due to its strong absorption cross section around 980 nm. The colors of the UC emission can be adjusted by altering the doping concentration of Yb3+ and laser power density. Spectral analysis and theoretical calculations reveal the high compatibility of Yb3+ ions with Cs2NaErCl6, and the critical role of CR and energy-transfer processes in achieving efficient, tunable, and multimodal PL. Furthermore, the developed DP materials have been utilized in anticounterfeiting, information encoding, and narrow-band NIR photodetectors, expanding the versatile uses of rare-earth (RE)-based DP materials in the optoelectronics field.
研究领域:
材料科学
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光学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3722-3725
·
IF 1.339
Song Weiye,Guo Xingyuan,He Guanghui,Qin Weiping
β-NaLuF4:20%Yb,0.5%Tm,x%Gd (x = 10,20, 30) nanocrystals were synthesized by high temperature thermal decomposition method. X-ray diffraction (XRD) show the as-prepared samples are characteristic of a pure β-NaLuF4. Transmission
electron microscope (TEM) investigations indicate the nanocrystals have particle size of ∼85 nm with good monodispersity and well-defined crystallographic facets. Particularly, under 980 nm excitation, upconversion (UC) emissions in the UV range of 270–320 nm were observed in these
nanocrystals, which further prove that β-NaLuF4 is an excellent host for building UV compact solid-state lasers or fiber lasers.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 20
·7017-7025
·
IF 4.39
Yonghui Xu,Liang Zhang,Langping Dong,Shuwen Yin,Xiudi Wu,Hongpeng You
Novel single-doped and codoped SrGd2Al2O7-based (SGA) phosphors with tunable emission were synthesized via the solid-state reaction approach. The optimal SGA:0.0008Mn4+ phosphor presents an emission band peaking at 709 nm and shows great red luminescence properties. With the incorporation of Nd3+/Yb3+ into SGA:0.0008Mn4+, an efficient energy transfer Mn4+ → Nd3+/Yb3+ was observed. When Nd3+ and Yb3+ were codoped into SGA:0.0008Mn4+, an energy transfer mechanism from Mn4+ to Nd3+ to Yb3+ was found on the basis of the energy transfer mediation of Nd3+ connecting the Mn4+ and Yb3+ luminescent centers. It results in a strong near-infrared emission in the spectral region of high response of c-Si solar cells, which suggests a potential approach to improve the energy conversion efficiency of c-Si solar cells. The findings offer a novel route to design new down-conversion luminescent materials for the c-Si solar cells.
研究领域:
材料科学
·
无机化学
·
光电子学
·
新能源材料
·
固体物理
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Tie Cong,Yadan Ding,Xueqing Yu,Yue Mu,Xia Hong,Yichun Liu
A series of Cd 2+ doped hexagonal-phase NaYF 4 : Yb 3+ , Er 3+ upconversion nanoparticles (UCNPs) were synthesized via solvothermal method, and the effect of Cd 2+ on the upconversion luminescence (UCL) properties was investigated in detail. It was found that the introduction of Cd 2+ could enhance the UCL intensities of NaYF 4 : Yb 3+ , Er 3+ UCNPs significantly. The maximum enhancement occurred when the doping concentration of Cd 2+ was 7 mol%. Compared with the UCNPs without Cd 2+ doping, the total integral emission intensity was enhanced by ∼38 times. It was related to the unit cell expansion and the generated F − vacancies, which could decrease the crystal symmetry around the Er 3+ ions. The results shall facilitate the improvement of UCL properties and the potential applications of UCNPs in lighting, solar cells, optics encoding and so on.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaohong Li,Xiaozhen Zhang,Renhua Chen,Huafeng Liu,Leying Wang,Si Cheng,Yongzhi Yu
The internal modification with rare earth ion doping proved to be a very effective strategy for improving the luminescent properties of NaYF 4 -based upconversion materials. However, greatly enhancing the luminescence efficiency of NaYF 4 :Yb 3+ /Er 3+ remains a major challenge. Herein, the effects of Sn 4+ doping on the structure and luminescent performance of such material were explored. The hydrothermal molten-salt method was applied to synthesize the Sn 4+ -doped NaYF 4 :Yb 3+ /Er 3+ upconversion materials, and their crystal structures, morphologies, surface chemical composition and element states, and luminescence performance were characterized. It was found that Sn 4+ doping can significantly enhance the luminescence intensity and tailor the chromaticity of NaYF 4 :Yb 3+ /Er 3+ . In particular, the green (G) and red (R) luminescence intensity levels of the 30 mol% Sn 4+ doped material were increased by factors of 26.97 and 38.91, respectively. The R/G ratio was incremented from 0.34 for the undoped material to 0.83 for the 40 mol% Sn 4+ doped counterpart. The Sn 4+ doping led to the change of lattice distortion and crystal growth pattern of NaYF 4 :Yb 3+ /Er 3+ . The mechanism for Sn 4+ doping to affect the luminescence properties of the prepared upconversion material was also explored. The changes in luminescence intensity levels and R/G ratios could be attributed to the highly asymmetric distorted lattice and crystal field resulting from Sn 4+ doping.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
EPL
·
2011
·Vol. 96
·期 1
·18001
·
IF 2.753
A. H. Li,Q. Lü
The knowledge of the power density for which luminescence intensity reversal begins with power increase is of valuable importance for practical applications. Under 980 nm CW diode laser excitation, the maximum upconversion luminescence intensities were obtained at 4800, 5700, and 7100 W/cm2 for 2H9/2→4I15/2, 2H11/2&4S3/2→4I15/2, and 4F9/2→4I15/2 transition luminescences, respectively, in compact powder composed by cubic-phase NaYF4:
Yb3+,Er3+ nanoparticles with a most probable diameter of ∼46 nm. It was revealed experimentally that the reversal power density decreases as luminescent level rises. Excitation increase combined with radiative quantum efficiency decrease as power increase can reproduce this "n"-shape power dependence relationship.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yang Yu,Zuoling Fu,Zhiying Wang,Hanyu Xu,Mengmeng Dai,Rong Wang
In this paper, two types of phosphors, Cs 3 GdGe 3 O 9 :Er 3+ and Cs 3 GdGe 3 O 9 :Yb 3+ /Er 3+ , were synthesized using the high-temperature solid-state method, and a new role for Yb 3+ was successfully achieved. The presence of low phonon energy in the matrix and the low energy level mismatch between the 2 F 5/2 and the 4 I 11/2 enables the construction of a phonon-assisted channel between Yb 3+ and Er 3+ through doping with Yb 3+ ions. This channel overcomes thermal quenching and achieves thermal enhancement at high temperatures. Additionally, Yb 3+ increases the chance of non-radiative transition within the matrix, effectively converting the 980 nm laser into heat energy. This leads to a significant change in the surface temperature of the sample, greatly improving the photothermal conversion efficiency. Moreover, Yb 3+ greatly enhances the emission intensity of green light, resulting in a maximum relative sensitivity of 1.11 % K −1 for temperature measurements in the Er 3+ single-doped system and 1.28 % K −1 in the Yb 3+ /Er 3+ co-doped system, based on the Er 3+ thermally coupled energy level. These results demonstrate that this paper provides a new idea for materials to overcome thermal quenching and improve the efficiency of photothermal conversion and temperature sensing performance.
研究领域:
材料科学
·
光学
·
温度测量
·
光子学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Hao-tian ZHU,Hai-rui GUO,Qi-jing ZHENG,Chun-yan GUAN,Li-ping ZHU,Hai-bin LI,Jin-yu YANG
Ho 3+ and Yb 3+ co-doped La 7 P 3 O 18 up-conversion phosphors were prepared by a high-temperature solid-state process. XRD results reveal that the samples are mixtures of monoclinic structure La 7 P 3 O 18 crystals with P 21/ n space group and minor LaPO 4 crystals. UV—Vis DRS results indicate that La 7 P 3 O 18 crystal is an indirect semiconductor with an optical band gap of 4.10 eV. After 980 nm laser excitation, the Ho 3+ and Yb 3+ co-doped La 7 P 3 O 18 phosphors show the characteristic blue (486 nm), green (550 nm), and red (661 nm) luminescence peaks of Ho 3+ ions. The peak at 661 nm dominates in the up-conversion luminescence spectra of samples. Meanwhile, with the increase of Ho 3+ and Yb 3+ doping content, the up-conversion luminescence intensity increases first and then decreases. By increasing the doping contents of Ho 3+ and Yb 3+ up to 1 at.% and 10 at.%, respectively, concentration quenching may appear by an electric quadrupole– electric quadrupole interaction process. The pumping power dependence of luminescence indicates that the green and red emissions of samples are excited by a two-photon absorption process. The color coordinates of Ho 3+ and Yb 3+ co-doped La 7 P 3 O 18 crystals locate in the orange—red region.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Heming Ji,Jiale Tang,Xunze Tang,Zhe Yang,Haiyan Zhang,Yannan Qian
The rod-like NaNbO 3 :Er 3+ /Yb 3+ nanocrystals codoped with Mg 2+ ions were firstly synthesized by hydrothermal method. The effect of Mg 2+ ions on the phase structure and morphology of NaNbO 3 :Er 3+ /Yb 3+ was investigated by XRD and SEM spectra. Addition of Mg 2+ ions enhanced the intensities of green and red UC emissions by about 3 times and prolonged the lifetime of the 4 S 3/2 → 4 I 15/2 transition of Er 3+ ions. The pump power dependences were measured to understand the upconversion mechanism under 980 nm excitation. The tailored local environment of Er 3+ ions by codoping Mg 2+ ions was responsible for the improved optical characteristics of NaNbO 3 :Er 3+ /Yb 3+ /Mg 2+ nanocrystals.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 19
·14123-14128
·
IF 3.84
Yue Tian,Bining Tian,Cai'e Cui,Ping Huang,Lei Wang,Baojiu Chen
Yb3+/Er3+ codoped spherical Gd2O3 phosphors with different particle sizes were prepared via a urea-assisted homogeneous precipitation process by adjusting the molar ratio of rare earth ions and urea followed by annealing at high temperature. The phases, morphologies, and luminescence properties of the as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and upconversion luminescence (UCL) spectra, respectively. The spherical Gd2O3:Yb3+/Er3+ phosphors showed size-dependent upconversion luminescence properties under the excitation of 980 nm-laser. The temperature sensing behavior of spherical Gd2O3:Yb3+/Er3+ phosphors with different particle sizes was studied based on the change of emission intensities from two thermally coupled 2H11/2 and 4S3/2 levels. It is interesting to observe that the sensing sensitivity of the sample increases with decreasing particle size and a sensitivity of 84 × 10−4 K−1 was obtained for the sample with a particle size of 45 nm. Finally, Judd–Ofelt theory was used for explaining and predicting the effect of particle size on sensing sensitivity.
研究领域:
材料科学
·
无机化学
·
光学材料
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）