JOURNAL OF RAMAN SPECTROSCOPY
·
2023
·Vol. 54
·期 6
·651-661
·
IF 2.5
Pengfei Shuai,Qingfeng Guo,Libing Liao,Zhaoliang Yan,Ke Su,Yujia Wang,Lefu Mei
In this work, a method for controllable regulation of crystal form was proposed for the first time and the effects of different crystal forms on the up-conversion luminescence properties of Ho 3+ , Yb 3+ co-doped K 3 Sc 0.5 Lu 0.5 F 6 (KSLF) phosphors was explored. KSLF:Ho 3+ , Yb 3+ phosphors were synthesized by the high temperature solid-state reaction method, and X-ray diffraction (XRD) results illustrate that the compounds can obtain monoclinic phase and cubic phase at different synthesis temperatures. In addition, according to the power-dependent up-conversion luminescence (UCL) intensity, the UCL mechanism and the electronic transition process are discussed. Simultaneously, the temperature sensing behavior of the best samples with different crystal forms at different temperatures was studied by fluorescence intensity ratio technique. All the results show that KSLF:Ho 3+ , Yb 3+ phosphors show great application potential in the field of temperature sensing, and the preparation of KSLF:Ho 3+ , Yb 3+ in different crystal forms can provide a reference value for crystal design and growth.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Chuancheng Zhang,Shoujun Ding,Wenzhi Su,Miaomiao Wang,Haitang Hu,Yong Zou,Wenpeng Liu,Qingli Zhang
Inhomogeneous broadening in disordered crystals has been widely recognized as a successful approach to enhance the spectral bandwidth of rare earth ions in optical spectra, and the Yb3+-doped mixed laser crystals are known as ultrafast pulse materials and have emerged as a hotspot recently. In this study, mixed sodium gadolinium/lanthanum double molybdate disordered laser crystals NaGd(1–x)La(x)(MoO4)2 with x = 0.3, 0.5, and 0.9 were grown by the Czochralski (Cz) method. The structure of as-grown crystals was investigated by XRD, SEM, FT-IR, and Raman experiments. The spectroscopic properties, including absorption, emission, and fluorescence decay characteristics, were investigated thoroughly. The NaGd0.5La0.5(MoO4)2 (NGLM) composite crystal exhibited an exceptionally broad absorption which reaches 70 nm (fwhm) at 980 nm, exceeding those of NaGd(MoO4)2 (NGM) and NaLa(MoO4)2 (NLM). Additionally, the electronic structures (band structure and density of states) of NGM, NGLM, and NLM were determined from the first-principles method combined with the PBE function. The calculations of defect formation energies under O-poor and O-rich conditions demonstrate that the +2 defects are easily generated in the undoped NGM crystal prepared under reducing atmospheres, and the calculation of absorption properties reveals that the black color of NGM without annealing is mainly attributed to intraband transitions between defect induction states and VBM or CBM. Moreover, the lifetimes of excited energy level 2F5/2 of Yb3+ were examined under different experimental environments to obtain the intrinsic radiative lifetime, and the emission cross section was calculated as 2.25 × 10–20 cm2 at 1016 nm. The features of the Yb3+:NaGd(1–x)La(x)(MoO4)2 crystal indicate the potential applications for ultrafast and broad tunable laser through slight regulation of the composite engineering strategy.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu Fu,Huwei Li,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Near-infrared (NIR) light-emitting diodes (LEDs) are potential devices that could become the core components in biological imaging, security monitoring, etc., which are currently constrained by suboptimal luminous efficiency due to the absence of excellent luminescent materials. Here, we report a double perovskite Cs2NaInCl6 that is suitable for Cr3+ doping and exhibits broad NIR emission. Through direct absorption and energy transfer (ET) from the self-trapped excitons (STEs) induced in the Cs2NaInCl6 matrix, Cr3+ can be excited to 4T1(P), 4T1(F), and 4T2(F) levels. Then, the broad emission with a full width at half-maximum (FWHM) of ∼150 nm, spanning 800 to 1300 nm, and a high photoluminescence quantum yield (PLQY) of up to 70% can be realized, resulting from the 4T2→4A2 transition of Cr3+. Subsequently, the introduction of Yb3+ endows Cs2NaInCl6:Cr3+,Yb3+ with a higher PLQY of 76% at the optimal doping ratio than Cs2NaInCl6:Cr3+. Ultimately, a miniaturized NIR LED device packaged based on Cs2NaInCl6:15%Cr3+,15%Yb3+ has been fabricated, which demonstrates superior performance for night vision, traceless perspective detection, and biological imaging. This work not only screens out a suitable Cs2NaInCl6 matrix for Cr3+ doping with high PLQY but also promotes its luminescence performance through Yb3+ doping for NIR LED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ling Wang,Koucheng Chen,Hui Tong,Ke Wang,Lu Tao,Yinxi Zhang,Xingfu Zhou
In this study, a Yb 3+ , Er 3+ co-doped TiO 2 inverted pyramid nanorod (NR) array and a compact TiO 2 film are simultaneously fabricated as the mesoporous support layer and electron-blocking layer, respectively, by a one-pot hydrothermal method . The scanning electron microscopy results show that the incorporation of Er 3+ and Yb 3+ causes changes not only in the growth rate of the NRs, but also in the TiO 2 NR morphology. The Er 3+ , Yb 3+ co-doped TiO 2 NRs exhibit an inverted pyramidal morphology, which is beneficial for perovskite permeation and light utilization. Notably, the Er 3+ , Yb 3+ co-doping causes changes in the band gap of TiO 2 and leads to 25% increase in the current density. The electrochemical impedance spectroscopy results show that the device based on the doped TiO 2 NRs has a higher recombination resistance and a lower transfer resistance than those of the undoped device, and thereby, the doped device exhibits a lower electron recombination rate. In addition, the upconversion Er and Yb co-doped device exhibits 25% higher current density and 17% higher photon-to-electron conversion efficiency, as revealed by the J-V test results. Moreover, the optimized efficiency of the TiO 2 NR array-based perovskite solar cell is determined to be 10.02%. Furthermore, the Er and Yb co-doped device exhibits a near-infrared response, an efficiency of 0.1% is achieved under infrared light (800–1100 nm) irradiation. This upconversion material can widen the photovoltaic responses of solar cells into the near-infrared region and improve the utilization of sunlight.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 38
·e05477
·
IF 12.1
Sheng Zhang,Xiuxia Yang,Jianqiang Xiao,Junxiao Wu,Xingliang Luo,Siyuan Luo,Huaiqiang Ba,Yuan Xue,Jie Yu,Xuhui Xu
Mechanoluminescence (ML) refers to the unique phenomenon that converts mechanical energy into optical energy. However, at present, there are many kinds of ML generation mechanism models, such as piezoelectric type, triboelectric type, trap-related type, etc., which seriously affect the understanding of the intrinsic mechanism models. Herein, a rare-earth-doped fluoride glass ceramic (Ba 2 LaF 7 :Yb 3+ glass-ceramic, BYG) is developed capable of dual-mode near-infrared ML (NIR ML) via triboelectric and frictional heat pathways. The triboelectric-induced ML arises from interfacial charge transfer between the glass and organic polymer matrices, directly exciting Yb 3+ emission centers. In contrast, frictional heat-induced ML involves the carriers released from oxygen vacancies generated by X-ray irradiation. Such dual-mode NIR ML demonstrates a robust linear correlation with applied stress, enabling the development of a visualized bright-field sensing platform for real-time monitoring of triboelectric potentials and frictional temperatures. Furthermore, this work not only advances the mechanistic understanding of ML but also provides a versatile strategy for indirect optical sensing in ambient environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Optoelectronics
·
2023
·Vol. 16
·期 1
·1-11
·
IF 5.4
Zhang Chuancheng,Ding Shoujun,Wang Miaomiao,Ren Hao,Tang Xubing,Zou Yong,Dou Renqin,Liu Wenpeng
Optical thermometry based on the upconversion (UC) luminescence intensity ratio (LIR) has attracted considerable attention because of its feasibility for achievement of accurate non-contact temperature measurement. Compared with traditional UC phosphors, optical thermometry based on UC single crystals can achieve faster response and higher sensitivity due to the stability and high thermal conductivity of the single crystals. In this study, a high-quality 5 at% Yb 3+ and 1 at% Ho 3+ co-doped Gd 0.74 Y 0.2 TaO 4 single crystal was grown by the Czochralski (Cz) method, and the structure of the as-grown crystal was characterized. Importantly, the UC luminescent properties and optical thermometry behaviors of this crystal were revealed. Under 980 nm wavelength excitation, green and red UC luminescence lines at 550 and 650 nm and corresponding to the 5 F 4 / 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions of Ho 3+ , respectively, were observed. The green and red UC emissions involved a two-photon mechanism, as evidenced by the analysis of power-dependent UC emission spectra. The temperature-dependent UC emission spectra were measured in the temperature range of 330–660 K to assess the optical temperature sensing behavior. At 660 K, the maximum relative sensing sensitivity ( S r ) was determined to be 0.0037 K −1 . These results highlight the significant potential of Yb,Ho:GYTO single crystal for optical temperature sensors. Graphical abstract
研究领域:
光学材料
·
固体物理
·
发光光谱学
·
温度传感技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 18
·1251
·
IF 2.8
Zheng Jinjie,Shen Honglie,Li Yufang,Li Hechao,Yue Zhen
Novel efficient visible and near-infrared emitting phosphors NaY(MoO 4 ) 2 (NYM):Ln 3+ (Ln = Ce and Yb) were proposed in this work. The crystal structure, lattice vibration characteristics, morphology, and luminescent properties of NaY(MoO 4 ) 2 phosphors were described. Sensitization of Ln 3+ from the host with various doping concentrations was investigated. The yellow-green emission was achieved in Ce 3+ single-doped NYM phosphors at UV ultraviolet excitation sensitized by the MoO 4 2− group. Under UV excitation, characteristic emissions of Ce 3+ at 400–700 nm and Yb 3+ at 1000 nm of NYM:Ce,Yb were observed, enabling the spectral down-conversion applications. With the increasing concentration of Yb 3+ , the emission intensity as well as the lifetime of Ce 3+ decreased, confirming the energy transfer from Ce 3+ ions to Yb 3+ ions. And the energy transfer coefficient was 27% for NYM:0.01Ce,0.10Yb phosphor. These results indicate that the as-prepared phosphors have potential applications in optical and photonic devices.
研究领域:
材料科学
·
光学材料
·
发光学
·
无机化学
·
光子学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yuexin Zhu,Peng Ran,Chunshen Li,Chao Wang,Jinlong Zhu,Jiawen Xiao,Yang (Michael) Yang,Peng Zhang
High-performance X-ray scintillation detectors are crucial for X-ray imaging applications, relying on scintillators with high light-yield (LY). In contrast to conventional scintillators with large bandgaps ( E g ), halide perovskite materials with low E g exhibit high LY, emerging as next-generation scintillation materials. Additionally, doping with rare-earth ions extends the emission wavelength to the near-infrared (NIR) region, effectively suppressing light self-absorption of perovskite materials. Here, we fabricated a Ytterbium-ion (Yb 3+ ) doped CsPbCl 3 : 2%Yb 3+ single crystal (SC) with a large-size of Φ30 × 40 mm via the Bridgman method, which exhibits a low E g of 2.88 eV and efficient NIR luminescence centered at 985 nm, achieves a high steady state LY of 83 703 photons MeV −1 , and a large effective “Stokes shift” of 563 nm. Furthermore, we prepare a series of flexible scintillation films by embedding CsPbCl 3 : 2%Yb 3+ powder in polydimethylsiloxane (PDMS). Owing to the efficient NIR luminescence, these films enable clear X-ray imaging even under bright white-LED interference, demonstrating a low X-ray detection limit of 17.8 nGy air s −1 and a high spatial resolution of 10 lp mm −1 . This work provides a high-LY NIR scintillator for X-ray flexible imaging, paving the way for low dose-rate X-ray imaging for portable and fast radiography.
研究领域:
生物医学工程
·
医学影像学
·
材料科学
·
辐射探测
·
纳米医学
·
转化医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Xinyue Li,Xiaoke Wang,Yongwang Cao,Lizhi Xu,Long Han,Yi Ma,Wei Lv,Zhipeng Li
The Lu 2 O 2 S exhibits exceptional properties in terms of its high density, chemical stability, and optical inertia as a luminescent matrix material , however, the preparation process poses significant challenges. Herein, solid phase synthesis was improved to prepare Lu 2 O 2 S: Er 3+ /Yb 3+ phosphors with high crystallinity and homogenous particle size without agglomeration. The phosphor continuously emits bright green light under the excitation of a near-infrared 980 nm laser, which is not affected by the laser power, doping concentration and temperature. The optical thermal sensing performance of the phosphor using LIR (Luminescence intensity ratio) method was carried out, the Sr (relative sensitivity of temperature) is rather high with reaching a maximal value of 0.99 % K −1 at 363 K, indicating Lu 2 O 2 S:Er 3+ /Yb 3+ up-conversion phosphor has good temperature sensing behavior. Furthermore, through spectral overlap and luminescence decay lifetime, the energy transfer mechanism was inferred to be a quadrupole-quadrupole interaction. This work suggests that Lu 2 O 2 S:Er 3+ /Yb 3+ phosphor could be a candidate for non-contact nanothermometers, anti-counterfeit and biological imaging.
研究领域:
材料科学
·
光学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Results in Chemistry
·
2025
·
IF 4.2
Juan Wang,Renguang Ye,Youjie Hua,Xuejiao Wang,Tianzhi Jiang,Caixia Song,Luping Lyu,Junhao Wu,Hongping Ma,Chenxia Li,Degang Deng,Shiqing Xu
A series of Y 2 O 2 S: 0.25 % Ho 3+ /x%Yb 3+ (where x = 4, 6, 8, and 10) phosphors were synthesized by using a chemical co-precipitation method, and their temperature sensing properties were systematically investigated. The upconversion luminescence (UCL) spectra of the samples were recorded under 980 nm laser excitation. The Y 2 O 2 S: Ho 3+ /Yb 3+ system exhibits three distinct UC emission bands in the green, red, and near-infrared regions, corresponding to the transitions of 5 F 4 / 5 S 2 → 5 I 8 , 5 F 5 → 5 I 8 , and 5 F 4 / 5 S 2 → 5 I 7 of Ho 3+ , respectively. According to the emission spectra, the sample with a Yb 3+ doping concentration of 6 % exhibited the strongest luminescence intensity, with a quantum yield reaching 4.01 %. To further explore its temperature sensing properties, the fluorescence intensity ratios (FIR) of both thermally coupled energy levels (TCLs) and non-thermally coupled energy levels (NTCLs) of Ho 3+ were systematically analyzed. Notably, temperature sensing materials based on NTCLs exhibit significantly enhanced sensitivity while maintaining a broad temperature measurement range. Specifically, the absolute sensitivity (S A ) increased from 0.011 % to 0.498 %, representing an approximately 45-fold improvement. These findings indicate that Y 2 O 2 S: Ho 3+ /Yb 3+ UCL materials possess excellent potential for applications in optical temperature sensing.
研究领域:
材料科学
·
光学
·
固体物理
·
发光学
·
温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）