Materials
·
2015
·Vol. 8
·期 8
·5363-5375
·
IF 2.651
Liangjie Pan,Benxue Jiang,Jintai Fan,Qiuhong Yang,Chunlin Zhou,Pande Zhang,Xiaojian Mao,Long Zhang
The synthesis of pure and well dispersed lutetium aluminum garnet (LuAG) powder is crucial and important for the preparation of LuAG transparent ceramics. In this paper, high purity and well dispersed LuAG powders have been synthesized via co-precipitation method with lutetium nitrate and aluminum nitrate as raw materials. Ammonium hydrogen carbonate (AHC) was used as the precipitant. The influence of aging time, pH value, and dripping speed on the prepared LuAG powders were investigated. It showed that long aging duration (>15 h) with high terminal pH value (>7.80) resulted in segregation of rhombus Lu precipitate and Al precipitate. By decreasing the initial pH value or accelerating the dripping speed, rhombus Lu precipitate was eliminated and pure LuAG nano powders were synthesized. High quality LuAG transparent ceramics with transmission >75% at 1064 nm were fabricated using these well dispersed nano LuAG powders.Keywords:co-precipitation method;single phase;pH values;LuAG powder;transparent ceramics
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Chaoyang Ma,Fei Tang,Jiangfeng Zhu,Zicheng Wen,Yang Yu,Ke Wang,Miaomiao Du,Jiantao Zhang,Jiaqi Long,Xuanyi Yuan,Wang Guo,Yongge Cao
Composite structures of YAG/1 at% Nd-doped LuAG/YAG, YAG/1 at% Nd-doped LuAG and YAG/5 at% Yb-doped LuAG transparent ceramics were successfully fabricated by non-aqueous tape-casting method and vacuum sintering technology. Cation (Y 3+ , Lu 3+ , Nd 3+ , Yb 3+ ) diffusion behavior across the contact boundaries between ytterbium (Yb) or neodymium (Nd) doped lutetium aluminum garnet (LuAG) and un-doped yttrium aluminum garnet (YAG) was studied by the electron probe X-ray micro-analysis (EPMA). The diffusion concentration profile curves were well modeled by Harrison type B kinetics. Curves of concentration vs depth were well fitted by Fick’s second low and the log of the average concentration varies as 6/5 power of penetration depth in the diffusion range was demonstrated. Meanwhile, the bulk diffusion coefficient and grain boundary diffusion coefficient were calculated. For YAG/Nd:LuAG transparent ceramic, under an 808 nm diode laser pumping, the 1064 nm continuous wave (C.W.) laser output beam with good quality was achieved.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 8
·期 3
·746-757
·
IF 5.958
Bing Yan,Yi Wei,Wei Wang,Meiqian Fu,Guogang Li
Currently, the development of excellent red phosphor materials has attracted much attention in daily lighting, backlit displays, optical thermometry sensors and plant growth fields. However, spectral peak position modulation and bandwidth are still crucial challenges. Herein, we design Eu3+→Mn4+ energy transfer in the Lu3Al5O12 (LuAG) garnet host. On the one hand, photoluminescence tuning from narrow orangish-red emission (593 nm) to narrow deep-red light (668 nm) is successfully obtained, and the energy transfer efficiency reaches 47%. On the other hand, LuAG:Eu3+ exhibits anti-thermal-quenching properties; that is, the peak intensity reaches 166% at 200 °C of the initial intensity at 25 °C. By designing Eu3+→Mn4+ energy transfer, Mn4+ thermal quenching performance is dramatically improved. The photoluminescence peak intensities at 668 nm for LuAG:0.01Mn4+ and LuAG:0.05Eu3+,0.01Mn4+ retain 3.26% and 26% at 200 °C of the original intensity at 25 °C. The corresponding energy transfer mechanism to improve thermal quenching is revealed. According to the fluorescence intensity ratio technique, the maximum values of Sa and Sr for LuAG:0.05Eu3+,0.01Mn4+ are 0.07 K−1 and 0.7% K−1 at 303 K. The temperature sensitivity calculation indicates that LuAG:Eu3+,Mn4+ phosphors can act as promising candidates in optical thermometry sensors. This work provides an insight to achieve narrow red emission modulation and thermal quenching improvement.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yue Qi,Renguang Ye,Youjie Hua,Lishuo Huang,Can Jin,Tianzhi Jiang,Jingtao Zhao,Muzhi Cai,Bingpeng Li,Gongxun Bai,Shilong Zhao,Junjie Zhang,Shiqing Xu
High-brightness and high-power laser lighting technology driven by blue laser diodes requires the development of thermally stable fluorescent conversion materials. Phosphor-in-glass-ceramics offers promising solutions for laser lighting applications due to their ease of synthesis and excellent thermal stability. In this study, Na 2 O-CaO-SiO 2 (NCS) glass matrix and LuAG phosphor were combined and processed using spark plasma sintering (SPS) at 600 °C to fabricate phosphor-in-glass (PIG). By controlling the crystallization process, LuAG phosphor-in-glass-ceramics (PIGC) incorporating Na 4 Ca 4 Si 6 O 18 microcrystals with a high crystallization degree of 89.5% and excellent luminescent properties was successfully prepared. Compared to LuAG-PIG, the luminous flux of LuAG-PIGC has risen by 43% under laser irradiation. LuAG-PIGC achieves the LF of 910.3 lm and the LE of 316.8 lm/W. Under an excitation of 3.35 W, he PIGC sample exhibited a surface temperature of 169.3 °C, which was 92 °C lower than that of the PIG sample without the use of an external heatsink. These results indicate that LuAG-PIGC possesses excellent thermal stability and has significant potential as novel fluorescent conversion materials for laser lighting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Nan Jiang,Yu Zhao,Zhiwei Zhu,Wenxue Li,Haiyun Qu,Haohong Chen,Lin Ge,Tengfei Xie,Qiang Liu,Yubai Pan,Jiang Li
Planar waveguide LuAG/10 at.%Yb:LuAG/LuAG laser ceramics were fabricated by the tape casting method combined with the vacuum pre-sintering and hot isostatic pressing (HIP) post-treatment. The morphologies of the raw materials, tapes and green bodies were observed. The microstructure, optical transmittance and the Yb 3+ ions distribution of the LuAG/10 at.%Yb:LuAG/LuAG ceramics with different pre-sintering temperatures after HIP post-treatment were mainly studied. The experimental results showed that the average grain size and in-line transmittance of the HIPed ceramics increased with the increase of pre-sintering temperature. For the LuAG/10 at.%Yb:LuAG/LuAG ceramics pre-sintered at 1825 °C for 20 h and then HIPed at 1700 °C for 3 h under 200 MPa Ar atmosphere, the in-line transmittance of the sample with the thickness of 2 mm was about 74% at 1100 nm and the maximum diffusion distance of Yb 3+ was about 166 μm. The bulk and grain boundary diffusion coefficients of Yb 3+ ions for the samples pre-sintered at 1775 °C–1825 °C after HIP post-treatment were calculated by Fick's second law by using the LA-ICP-MS. What's more, CW laser at 1030 nm was demonstrated and the maximum output power of 0.4 W with a slop efficiency of 9.4% was achieved.
研究领域:
材料科学
·
光学
·
激光物理
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jie Fu,Ying Zhang,Zhibiao Ma,Linghan Bai,Ruyu Fan,Wenlong Xu,Mathieu Allix,Cécile Genevois,Emmanuel Veron,Yafeng Yang,Hui Wang,Jianqiang Li
Transparent Lu 3 Al 5 O 12 (LuAG) ceramics have become very promising phosphor matrix materials due to their high doping concentration and luminous efficiency, thermal conductivity and thermal stability. However, LuAG transparent ceramics prepared by traditional powder sintering method are facing several problems, such as time-consuming and energy-consuming, complex preparation process, high quality of raw material powders and large crystalline grain size. Here we report facile elaboration of transparent LuAG-Al 2 O 3 two-phase nanocrystalline ceramics through pressureless crystallization (1000 °C, 2 h) of 72 mol.% Al 2 O 3 -28 mol.% Lu 2 O 3 (ALu28) bulk glasses combined with the crystallization kinetics analysis. The results of the crystallization kinetics analysis show that the ALu28 bulk glasses have a low activation energy (<750 kJ mol −1 ) and a crystallization mechanism of three-dimensional crystal growth mode accompanied by volume nucleation. The resulting LuAG-Al 2 O 3 ceramics with nanosized grains and dense three-dimensional network nanostructures present good transmittance (80.6 %@780 nm) and excellent mechanical properties (hardness is 24 GPa).
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Qi Zhang,Ruilin Zheng,Haiyang Wu,Guoyu Zhao,Jianyong Ding,Kehan Yu,Wei Wei
Thermally robust and efficient composite ceramic phosphors (CCPs) combined both the merits of matrix and phosphor have received growing interests. However, high matrix content (e.g., Al 2 O 3 >40 wt%) brings diluted activated ion concentration and dropped photoluminescence (PL) quantum yield (QY). Here, a novel layered array Al 2 O 3 -LuAG: Ce CCP, where Al 2 O 3 and LuAG: Ce thin layers (10–250 µm) are alternately arranged, was presented. Owing to the special structure, thermal phonons and photons are respectively routed into Al 2 O 3 layers and LuAG: Ce layers, which weakens the influence of Al 2 O 3 and heat accumulation on PL properties. Consequently, it exhibits high PLQY (84.1%) and good thermal conductivity (17.1 W·m −1 ·K −1 ). When it is irradiated under high-power density (27.2 W·mm −2 ) blue laser , the luminous efficiency and lumen-density are promoted to 220 lm·W −1 and 5994 lm·mm −2 , respectively. This work provides a promising new microstructure in developing novel phosphor converters for high-brightness laser phosphor display.
研究领域:
材料科学
·
光电子学
·
陶瓷工程
·
光子学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Liangjie Pan,Benxue Jiang,Jintai Fan,Pande Zhang,Xiaojian Mao,Long Zhang
Aluminum Garnet (LuAG) precursors were co-precipitated by using ethanol–water as the precipitant solvent. The effect of different volume ratios of ethanol to water ( R ) on the preparation of pure-phase LuAG powders has been mainly studied. The evolution of phase, composition and micro-structure of the as-synthesized LuAG powders were characterized by TG/DTA, FTIR , XRD , BET, and SEM. The BET-equivalent diameter of LuAG nano particles increased with R . The ethanol–water solvent does not change the main composition of the LuAG precursors, but has great influence on the morphology of the final LuAG nano particles . Uniformly dispersed LuAG powders calcined at 1200 °C for 3 h with a particle size of approximately 120 nm were obtained by using ethanol–water solvent with proper R = 1. The mechanism of ethanol in the preparation process was discussed.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 7
·3260-3268
·
IF 3.784
Qi Zhang,Ruilin Zheng,Jianyong Ding,Peng Cui,Zhongyue Wang,Peng Lv,Wei Wei
Thermally robust and highly efficient green-emitting luminescent ceramics are gradually attracting great attention as promising phosphors using in high-brightness laser phosphor display to reduce serious speckle noise as well as high cost. However, lumen density is still seriously restricting their potential applications especially under high-power density laser due to insufficient absorption of blue laser and significant thermal quenching. Here, we report an Al 2 O 3 -LuAG: Ce composite ceramic phosphor (CCP) for high-brightness laser phosphor display. Owing to good optical properties and high thermal conductivity of Al 2 O 3 , the Al 2 O 3 -LuAG: Ce CCP shows high photoluminescence quantum yield (79.6%), low thermal quenching (only 3.2% loss in luminescence at 200°C), and high thermal conductivity (18.9 W·m −1 ·K −1 ). Moreover, the Al 2 O 3 , as scattering centers, enhances the Rayleigh–Mie scattering of the blue laser, and hence the absorption of the Al 2 O 3 -LuAG: Ce CCP exhibits a remarkable improvement (~2.3 times) at 450 nm. Finally, with optimized thickness (0.3 mm) of Al 2 O 3 -LuAG: Ce CCP, an excellent luminous efficiency (216 lm·W −1 ) and outstanding lumen density (6129 lm·mm −2 ) of the green-emitting light source was obtained by driving under a high-power density (28.33 W·mm −2 ) blue laser. All of those validate the suitability of the Al 2 O 3 -LuAG: Ce CCP for high-brightness display.
研究领域:
材料科学
·
光学工程
·
光子学
·
显示技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Minghui Zhou,Jun Sun,Bei Zhang,Youjie Hua,Feifei Huang,Hongping Ma,Renguang Ye,Shiqing Xu
Phosphor-in-ceramic (PiC) has garnered considerable attention in high-power white laser lighting owing to its advantages, such as high efficiency and good thermal stability. In this study, a transparent hydroxyapatite (HA) ceramic was successfully prepared via spark-plasma sintering (SPS) under relatively mild conditions. A series of ultra-high efficiency green-emitting PiCs were obtained by pure HA ceramics with 1–12% Lu 3 Al 5 O 12 : Ce (LuAG) phosphors. Owing to the rapid sintering of SPS and the stability of HA ceramics, HA ceramic matrix has high transparency, and does not damage the crystal structure of the LuAG phosphor. When excited by a blue laser, the HA-LuAG PiC exhibited an excellent luminous efficacy of 300.48 lm·W −1 . The fluorescence saturation threshold of the laser power was approximately 7.90 W. These results demonstrate that HA-LuAG PiCs have great potential for applications as efficient green-emitting phosphor conversion materials for high-power laser lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Pande Zhang,Benxue Jiang,Jintai Fan,Xiaojian Mao,Long Zhang
Cr and Nd co-doped laser ceramics, as the potential gain materials in inertial confinement fusion (ICF), have been widely investigated. And the study on valence states of chromium ions is important. The effects of sintering additives and annealing atmosphere on the valence state of chromium were studied in detail, and the results shown that the Cr valence states were demonstrated to be Cr 2+ and Cr 3+ ions in HIP-sintered Cr(0.2 at.%), Nd(0.8 at.%): LuAG laser ceramics. And the intensity of the near-infrared absorption band caused by Cr 2+ ions was attenuated with the decreasing SiO 2 concentration and increasing MgO amount. The near-infrared absorption could be eliminated by annealing in air. And the transformation of valence states of Cr ions in the Cr,Nd:LuAG ceramics were also confirmed by electron paramagnetic resonance and X-ray photoelectron spectroscopy.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Ruofeng Wang,Ying Shi,Jianjun Xie,Fang Lei,Lingcong Fan,Ding Zhou
The thulium and holmium co-doped lutetium aluminum garnet (Tm,Ho:LuAG) ceramics were fabricated by vacuum sintering at 1760 °C for 10 h. The raw powders free of sintering aids were synthesized by co-precipitation method. The phase composition, crystalline behaviors, and morphology of the powders calcined at different temperatures were studied by scanning and transmission electron microscopy . Well-dispersed Tm,Ho:LuAG powders with the primary particle size of 80 nm were obtained by calcinations at 1200 °C for 2 h in the muffle furnace. The influence of agglomeration state of starting powder on densification and microstructure of Tm,Ho:LuAG ceramic was explored. The in-line transmittance of Tm,Ho:LuAG ceramic with the thickness of 1 mm reached 83.0% and the corresponding optical attenuation coefficient was about 0.013 mm −1 at 2500 nm. The average grain size of the Tm,Ho:LuAG ceramic was about 1.7 μm. It is promising that the Tm,Ho:LuAG optical ceramic would be a suitable candidate to realize lasers output at 2.1 μm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）