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学者姓名：周海芳
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Abstract ：
以乙二胺四乙酸（EDTA）和油酸（OA）为络合剂进行对比，利用溶剂热法制备出结晶度高、发光性能强的小尺寸六方相NaGdF_4:Er~(3+)/Yb~(3+)/Al~(3+)纳米晶。研究发现，OA比EDTA具有更强的络合能力和表面修饰作用，更容易制备出发光性能强的小尺寸纳米晶，当OA体积为17 mL时纳米晶具有最强的发光强度。氟源提供过量的F~-可以减少吸附在纳米晶表面的OH~-以降低能量共振损耗，进而提高了上转换纳米晶的发光性能，为生物医学成像方面提供了很好的应用。
Keyword ：
NaGdF_4纳米晶 NaGdF_4纳米晶 上转换发光 上转换发光 制备条件 制备条件 稀土 稀土
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| GB/T 7714 | 邹家欣 , 周海芳 . NaGdF_4纳米晶的制备条件对发光性能的影响 [J]. | 科技与创新 , 2024 , 5 (02) : 56-59,62 . |
| MLA | 邹家欣 等. "NaGdF_4纳米晶的制备条件对发光性能的影响" . | 科技与创新 5 . 02 (2024) : 56-59,62 . |
| APA | 邹家欣 , 周海芳 . NaGdF_4纳米晶的制备条件对发光性能的影响 . | 科技与创新 , 2024 , 5 (02) , 56-59,62 . |
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Lanthanide-doped upconversion nanoparticles (UCNPs)have potential applications in optical and optoelectronic devices due to their novel optical properties. The surface plasmon is an effective method in improving the upconversion luminescence (UCL) properties, and it is essential to tunee the distance between the metal NPs and UCNPs for improving UCL. In this work, the Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite films were fabricated, and the effect of the TiO2 layer thickness on spectral characteristics in the composite films was investigated. It is shown that the thickness of TiO2 film has a significant effect on the Ag NPs plasma resonance and fluorescence intensity. The maximum upconversion emission enhancement factors of the red and green emission were obtained for the sample with 15-nm-thickness TiO2 under the 980 nm excitation. That is mainly originated from the enhancement of the resonate energy transfer (Yb3+→Er3+) rate under the competition between non-radiative transition and local field effects. © 2022 Informa UK Limited, trading as Taylor & Francis Group.
Keyword ：
Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite films Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite films energy transfer energy transfer plasma resonance plasma resonance Upconversion fluorescence enhancement Upconversion fluorescence enhancement
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| GB/T 7714 | Zheng, P. , Chen, M. , Zhou, H. et al. Influence of TiO2 Space layer on plasmon enhanced Luminescence of Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite Films [J]. | Materials Research Innovations , 2023 , 27 (5) : 289-295 . |
| MLA | Zheng, P. et al. "Influence of TiO2 Space layer on plasmon enhanced Luminescence of Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite Films" . | Materials Research Innovations 27 . 5 (2023) : 289-295 . |
| APA | Zheng, P. , Chen, M. , Zhou, H. , Wang, C. , Lai, Y. , Yu, J. et al. Influence of TiO2 Space layer on plasmon enhanced Luminescence of Ag/TiO2/NaGdF4:Er3+/Yb3+/Al3+ composite Films . | Materials Research Innovations , 2023 , 27 (5) , 289-295 . |
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Surface plasmon resonance and photonic crystals (PCs) effect are effective methods for improving upconversion luminescence (UCL) for upconversion nanoparticles. In this work, PCs/Ag/Al2O3/UC hybrid structure is pre-sented to enhance UCL of NaGdF4:Er3+/Yb3+/Al3+ nanorods through tuning the thickness of the Al2O3 layer. The optical and luminescence properties were studied and compared with those of UC and PCs/Ag/UC hybrid, it is shown that the thickness of Al2O3 layer has a significant effect on fluorescence intensity, outstanding upcon-version luminescence enhancement and the green-to-red intensity ratios have been achieved at 980 nm excita-tion. The maximum enhancement factors of the red and green emission were obtained for the sample with 10 nm Al2O3 layer, respectively. The mechanism of UCL enhancement for PCs/Ag/Al2O3/UC hybrid structure was discussed.
Keyword ：
Ag Ag Dielectric confinement Dielectric confinement Energy transfer Energy transfer Local field enhancement Local field enhancement PCs PCs UC hybrid UC hybrid Upconversion enhancement Upconversion enhancement
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| GB/T 7714 | Zhou, Haifang , Zou, Jiaxin , Weng, Xuehua et al. Upconversion luminescence enhancement of NaGdF4:Er3+/Yb3+/Al3+nanorods through tuning Al2O3 layer in a hybrid photonic-plasmonic-dielectric structure [J]. | OPTICAL MATERIALS , 2023 , 137 . |
| MLA | Zhou, Haifang et al. "Upconversion luminescence enhancement of NaGdF4:Er3+/Yb3+/Al3+nanorods through tuning Al2O3 layer in a hybrid photonic-plasmonic-dielectric structure" . | OPTICAL MATERIALS 137 (2023) . |
| APA | Zhou, Haifang , Zou, Jiaxin , Weng, Xuehua , Lai, Yunfeng , Yu, Jinling . Upconversion luminescence enhancement of NaGdF4:Er3+/Yb3+/Al3+nanorods through tuning Al2O3 layer in a hybrid photonic-plasmonic-dielectric structure . | OPTICAL MATERIALS , 2023 , 137 . |
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Abstract ：
本发明涉及一种双局域场协同增强上转换发光的复合薄膜，包括衬底、光子晶体层、贵金属层、介质层和上转换发光层。所述复合薄膜的制备方法，先用溶剂热法制备NaGdF4 : Yb3+/Er3+/Al3+纳米晶，接着在衬底上制备光子晶体层，然后在光子晶体层上制备贵金属层，再在贵金属层上制备介质层，最后将上转换发光NaGdF4纳米晶旋涂于介质层上制得上转换发光层。该复合薄膜及其制备方法有利于提高上转换发光性能，且制备简单。
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| GB/T 7714 | 周海芳 , 翁雪花 , 赖云锋 et al. 双局域场协同增强上转换发光的复合薄膜及其制备方法 : CN202111634076.6[P]. | 2021-12-29 00:00:00 . |
| MLA | 周海芳 et al. "双局域场协同增强上转换发光的复合薄膜及其制备方法" : CN202111634076.6. | 2021-12-29 00:00:00 . |
| APA | 周海芳 , 翁雪花 , 赖云锋 , 程树英 . 双局域场协同增强上转换发光的复合薄膜及其制备方法 : CN202111634076.6. | 2021-12-29 00:00:00 . |
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采用溶剂热法,以乙二胺四乙酸(EDTA)为络合剂合成粗细均匀、六棱柱形的六方相Al~(3+)掺杂NaGdF_4:Er~(3+)/Yb~(3+)纳米棒,并研究了掺杂Al~(3+)离子的上转换纳米材料性能.结果表明,适量Al~(3+)掺杂对NaGdF_4的晶相没有产生影响,但使主衍射峰的位置发生偏移.在980 nm激光激发下,与未掺杂的纳米晶相比,当Al~(3+)的掺杂浓度为15%时,红绿光发光最大强度分别增强了5.7倍和5倍,且~4F_(9/2)能级的荧光寿命被延长. Al~(3+)掺杂对上转换发光的改善是因Er~(3+)附近局部对称性的降低和粒子表面吸附基团的减少所致.
Keyword ：
Al~(3+)掺杂 Al~(3+)掺杂 NaGdF_4:Er~(3+)/Yb~(3+)纳米晶 NaGdF_4:Er~(3+)/Yb~(3+)纳米晶 上转换发光 上转换发光 溶剂热法 溶剂热法
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| GB/T 7714 | 王春霞 , 周海芳 , 赖云锋 et al. Al~(3+)掺杂增强NaGdF_4:Er~(3+)/Yb~(3+)纳米晶的上转换发光 [J]. | 福州大学学报(自然科学版) , 2022 , 50 (01) : 61-66 . |
| MLA | 王春霞 et al. "Al~(3+)掺杂增强NaGdF_4:Er~(3+)/Yb~(3+)纳米晶的上转换发光" . | 福州大学学报(自然科学版) 50 . 01 (2022) : 61-66 . |
| APA | 王春霞 , 周海芳 , 赖云锋 , 俞金玲 , 程树英 . Al~(3+)掺杂增强NaGdF_4:Er~(3+)/Yb~(3+)纳米晶的上转换发光 . | 福州大学学报(自然科学版) , 2022 , 50 (01) , 61-66 . |
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Perovskite solar cells have drawn significant attention due to their excellent photovoltaic characteristics. Upconversion luminescence material modification is a good strategy to extend the device response to the near-infrared region, which can further increase device efficiency. By adding NaGdF4: Er3+/Yb3+ nanorods into chlorobenzene as an additive in the antisolvent to modify the perovskite layer, we found that upconversion luminescence nanoparticles can effectively improve the perovskite solar cell performance. However, unexpectedly, the photocurrent contributed by the infrared part is lower. The efficiency increase of perovskite solar cells is contributed by defect passivation. Further research shows that nanoparticles can effectively fill the holes and gaps at the grain boundaries, eliminate surface defects of the perovskite, and modify the perovskite film, which reduces carrier recombination and effectively improves the device's performance. Finally, the power conversion efficiency of the champion device can reach 21.1%. This research demonstrates the function of upconversion luminescence nanoparticles in PSCs and provides a simple way to improve the device's efficiency.
Keyword ：
Defect passivation Defect passivation NaGdF4: Er3+/Yb3+ NaGdF4: Er3+/Yb3+ Perovskite solar cell Perovskite solar cell Up-conversion luminescence Up-conversion luminescence
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| GB/T 7714 | Wu, Jionghua , Wei, Shuping , Weng, Xuehua et al. Understanding the efficiency enhancement of perovskite solar cells with NaGdF4: Er3+/Yb3+ nanorods [J]. | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 248 . |
| MLA | Wu, Jionghua et al. "Understanding the efficiency enhancement of perovskite solar cells with NaGdF4: Er3+/Yb3+ nanorods" . | SOLAR ENERGY MATERIALS AND SOLAR CELLS 248 (2022) . |
| APA | Wu, Jionghua , Wei, Shuping , Weng, Xuehua , Wang, Renjie , Zhou, Haifang , Cheng, Shuying . Understanding the efficiency enhancement of perovskite solar cells with NaGdF4: Er3+/Yb3+ nanorods . | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 248 . |
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The buffer layer plays a critical role in high-performance flexible Cu2ZnSn(S,Se)(4) (CZTSSe) solar cell. The conventional CdS buffer layer causes the photoelectric performance loss and the pollution of toxic Cd. Herein, the ultrathin CdS and Zn0.8Sn0.2O (ZTO) buffer layer engineering is proposed to reduce interface recombination and Cd content. An ultrathin CdS layer acts as the interface passivation layer to protect the CZTSSe layer and passivate its surface defects. To solve the problems of decreased carrier collection capacity caused by thinning the CdS layer, the ZTO layer with low resistivity and high carrier concentration is obtained by doping Sn into the ZnO layer. The systematic study indicates that the ultrathin CdS and ZTO buffer layers-based solar cells realize high-quality interface and band matching. Ultimately, 9.3% efficiency of the ultrathin CdS and ZTO-based solar cell with 448 mV open-circuit voltage is obtained, which is higher than that of the standard CdS buffer layer-based device (8.5% with 419 mV). The study provides a new idea for achieving efficient flexible CZTSSe solar cells through heterojunction interface management.
Keyword ：
flexible CZTSSe solar cells flexible CZTSSe solar cells heterojunction interfaces heterojunction interfaces ultrathin CdS ultrathin CdS ZTO ZTO
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| GB/T 7714 | Lin, Beibei , Sun, Quanzhen , Zhang, Caixia et al. 9.3% Efficient Flexible Cu2ZnSn(S,Se)(4) Solar Cells with High-Quality Interfaces via Ultrathin CdS and Zn0.8Sn0.2O Buffer Layers [J]. | ENERGY TECHNOLOGY , 2022 , 10 (10) . |
| MLA | Lin, Beibei et al. "9.3% Efficient Flexible Cu2ZnSn(S,Se)(4) Solar Cells with High-Quality Interfaces via Ultrathin CdS and Zn0.8Sn0.2O Buffer Layers" . | ENERGY TECHNOLOGY 10 . 10 (2022) . |
| APA | Lin, Beibei , Sun, Quanzhen , Zhang, Caixia , Deng, Hui , Xie, Weihao , Tang, Jianlong et al. 9.3% Efficient Flexible Cu2ZnSn(S,Se)(4) Solar Cells with High-Quality Interfaces via Ultrathin CdS and Zn0.8Sn0.2O Buffer Layers . | ENERGY TECHNOLOGY , 2022 , 10 (10) . |
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采用磁控溅射和金属剥离工艺制备结构为P-Si/HfO_2/Ti和P-Si/HfO_2/Al_2O_3/Ti的阻变存储器，两器件均表现出双极性电阻转变特性.插入的Al_2O_3层使得高阻态导电机制从空间电荷限制电流导电向肖特基发射控制导电转变，器件高低阻态阻值比从约61倍提高到约2.15×10~8倍.通过限制set电流的方式实现多值存储，器件的4个阻态都能够非常稳定地在85℃高温下保持10~4 s,有利于多值存储的实际应用.
Keyword ：
双介质层 双介质层 多值存储 多值存储 开关比 开关比 氧化铝 氧化铝 氧化铪 氧化铪 阻变存储器 阻变存储器
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| GB/T 7714 | 陈浩 , 周海芳 , 赖云锋 . Al_2O_3/HfO_2薄膜多值阻变存储特性 [J]. | 福州大学学报(自然科学版) , 2022 , 50 (05) : 621-626 . |
| MLA | 陈浩 et al. "Al_2O_3/HfO_2薄膜多值阻变存储特性" . | 福州大学学报(自然科学版) 50 . 05 (2022) : 621-626 . |
| APA | 陈浩 , 周海芳 , 赖云锋 . Al_2O_3/HfO_2薄膜多值阻变存储特性 . | 福州大学学报(自然科学版) , 2022 , 50 (05) , 621-626 . |
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制备不同厚度的Hf_(0.5)Zr_(0.5)O_2(HZO)薄膜，并使用不同退火温度对其进行热处理.在最优热处理条件下，所制备薄膜的两倍剩余极化强度可达约40μC·cm~(-2),矫顽场强低至约±1.15 MV·cm~(-1),其响应速度明显优于传统铁电材料.结果表明，HZO薄膜正交相与其铁电性有较大关系，过高的退火温度会导致四方相向单斜相转变，从而降低其铁电性.实验所得结果可为高性能HZO铁电器件的研究与制备提供一定参考.
Keyword ：
剩余极化强度 剩余极化强度 正交相 正交相 退火温度 退火温度 铁电薄膜 铁电薄膜 铪锆氧 铪锆氧
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| GB/T 7714 | 何业法 , 徐华义 , 邬海龙 et al. Hf_(0.5)Zr_(0.5)O_2超薄薄膜铁电性及其晶相演变 [J]. | 福州大学学报(自然科学版) , 2022 , 50 (05) : 616-620 . |
| MLA | 何业法 et al. "Hf_(0.5)Zr_(0.5)O_2超薄薄膜铁电性及其晶相演变" . | 福州大学学报(自然科学版) 50 . 05 (2022) : 616-620 . |
| APA | 何业法 , 徐华义 , 邬海龙 , 周海芳 , 赖云锋 . Hf_(0.5)Zr_(0.5)O_2超薄薄膜铁电性及其晶相演变 . | 福州大学学报(自然科学版) , 2022 , 50 (05) , 616-620 . |
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Noble metal surface plasmon resonance or photonic crystals (PCs) effect is a novel and effective method for improving upconversion luminescence (UCL). UCL can be effected by the size, thickness of the noble metal film and the photonic band gap (PBG) of the PCs. So it is important to improve UCL by coupling surface plasmons resonance (SPR) with PCs effect. In this work, the PCs/Ag/UC composite films were fabricated to improve the upconversion emission of NaGdF4:Er3+/Yb3+/Al3+ nanocrystals, and the influence of the Ag layer thickness on spectral properties was investigated. Studies reveal that the Ag layer thickness and morphology have a major impact on the Ag nanoparticles (NPs) plasma resonance and UCL intensity of NaGdF4:Er3+/Yb3+/Al3+ nanocrystals for PCs/Ag/UC composite films. The highest enhancement factors of the red and green emissions were found to be 43 and 42 under 980 nm excitation, respectively. That is attributed to the coupling effect of the Ag NPs local SPR and PCs Bragg reflection, the local electromagnetic field enhancement produced by the excitation wavelength overlapping with the photonic band gap and strong plasmon resonance band overlapping with emission wavelength.
Keyword ：
Local electromagnetic field enhancement Local electromagnetic field enhancement NaGdF4:Er3+/Yb3+/Al3+ nanocrystals NaGdF4:Er3+/Yb3+/Al3+ nanocrystals PCs/Ag/UC composite films PCs/Ag/UC composite films Upconversion enhancement Upconversion enhancement
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| GB/T 7714 | Zhou, Haifang , Weng, Xuehua , Zou, Jiaxin et al. Upconversion luminescence enhancement of the composite films by coupling local surface plasmon effect and photonic crystals effect [J]. | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING , 2022 , 128 (5) . |
| MLA | Zhou, Haifang et al. "Upconversion luminescence enhancement of the composite films by coupling local surface plasmon effect and photonic crystals effect" . | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 128 . 5 (2022) . |
| APA | Zhou, Haifang , Weng, Xuehua , Zou, Jiaxin , Lai, Yunfeng , Yu, Jinling , Cheng, Shuying . Upconversion luminescence enhancement of the composite films by coupling local surface plasmon effect and photonic crystals effect . | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING , 2022 , 128 (5) . |
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