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国家自然科学基金(11274038)

作品数:6 被引量:8H指数:1
相关作者:彭洪尚黄世华由芳田朱凡时秋峰更多>>
相关机构:北京交通大学教育部更多>>
发文基金:国家自然科学基金教育部“新世纪优秀人才支持计划”中央高校基本科研业务费专项资金更多>>
相关领域:理学化学工程一般工业技术更多>>

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Energy transfer from Ce^(3+) to Tb^(3+), Dy^(3+)and Eu^(3+) in Na_3Y(BO_3)_2
2015年
Energy transfer is a promising strategy to improve the visible light emitting efficiency of phosphors. A series of Ce3+, Tb3+, Dy3+ and/or EU3+ doped Na3Y(BO3)2 (NYB) were prepared by solid-state reaction and their photoluminescence properties were studied in detail. The excitation and emission spectra of NYB:Ce3+,Tb3+ and NYB:Ce3+,Dy3+ revealed that an efficient energy transfer process from Ce3+ to Zb3+ or Dy3+ occurred upon excitation Ce3+ into 5d level. The dependence of the decay times of Ce3+ 5d level on Tb3+ or Dy3+ concentration indicated that the energy transfer efficiency increased with increasing Tb3+ or Dy3+ content. So the UV excitation light could be converted into green or near-white emission. However, there was no obvious evidence of the existence of energy transfer from Ce3+ to Eu3+ in NYB.
曾洪伟由芳田彭洪尚黄世华
小粒径同质/异质壳层结构NaGdF4:3%Nd3+纳米颗粒的近红外发光特性被引量:1
2017年
采用共沉淀法制备了粒径小于5 nm的六方相NaGdF_4:3%Nd^(3+)纳米颗粒.纳米颗粒表面缺陷会使发光中心产生严重的淬灭,对其表面包覆适当厚度的壳层可以有效地减少发光淬灭,提高发光性能.对NaGdF_4:3%Nd^(3+)核心纳米颗粒分别进行同质和异质包覆并且通过调节核壳比制备了不同壳层厚度的NaGdF_4:3%Nd^(3+)@NaGdF_4和NaGdF_4:3%Nd^(3+)@Na YF4纳米颗粒,研究了不同的壳层厚度对核心纳米颗粒发光的影响,并对两种不同核壳结构纳米颗粒的发光性能进行了对比.在808 nm近红外光激发下,NaGdF_4:3%Nd^(3+)纳米颗粒发射出位于约866,893,1060 nm的近红外发射.与核心纳米颗粒相比,核壳结构的纳米颗粒的荧光强度增强,荧光寿命增长,并且随着壳厚的增加,荧光强度出现先增强后减弱、荧光寿命逐步增长的趋势.与相同条件下同质包覆的NaGdF_4:3%Nd^(3+)@NaGdF_4纳米颗粒相比,异质包覆的NaGdF_4:3%Nd^(3+)@NaYF_4纳米颗粒光谱荧光强度增强,寿命增长.
马文君由芳田彭洪尚黄世华
关键词:近红外发光
基于杂化纳米载体的单线态氧高效产生与荧光检测
光动力治疗(Photodynamic therapy,PDT)是一种以光、氧、光敏剂的相互作用为基础对肿瘤等疾病进行治疗的新兴技术。光敏剂在特定波长光的诱导下,发生光动力反应而产生大量的活性氧,主要以单线态氧(Singl...
平建涛
关键词:光动力治疗单线态氧纳米探针
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Investigation on energy transfer from Tb3+4f~7 5d to Gd3+ in GdPO4: Tb3+
<正>From the point of view of the application and theory, much work has been carried out on the spectroscopic p...
Qiufeng ShiFangtian YouYan HuangYe TaoShihua Huang
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Energy transfer and luminescent properties of Pr^(3+) and/or Dy^(3+) doped NaYF_4 and NaGdF_4被引量:1
2013年
The phosphors that are able to convert vacuum ultraviolet(VUV) light into visible light are demanded for the development of novel displaying and lighting devices.NaYF4:Pr3+,Dy3+,NaGdF4:Pr3+,NaGdF4:Dy3+and NaGdF4:Pr3+,Dy3+were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature.For NaYF4:Pr3+,Dy3+,no energy transfer process from Pr3+to Dy3+was observed.However,the introduction of Gd3+into the fluoride lattice led to intense Dy3+emissions upon Pr3+4f5d state excitation.Gd3+acted as an intermediate,resulting in efficient energy transfer from Pr3+to Dy3+in NaGdF4.Pr3+transferred most of its energy to Gd3+,and then the energy was transferred from Gd3+to Dy3+.So NaGdF4:Pr3+,Dy3+not only took full advantage of the intense Pr3+4f5d absorption,but converted the VUV excitation light into the near-white emission of Dy3+.
由芳田张新国彭洪尚黄世华黄艳陶冶
掺杂香豆素6的杂化纳米颗粒的制备及荧光性能研究(英文)被引量:1
2013年
采用一种再沉淀-封装法制备了掺杂香豆素6(C6)的杂化荧光纳米颗粒,并通过SEM和DLS对其进行了形貌和粒径大小表征。在450 nm光激发下,制备的C6掺杂纳米颗粒表现出绿色荧光。通过比较光致发光光谱随掺杂浓度的变化,得出C6掺杂纳米颗粒的浓度猝灭是因为分子间能量转移而非C6分子聚集所致。另外,由于所选聚合物基质材料PS和PMMA分子结构的区别,导致PS-基质和PMMA-基质的纳米颗粒的光谱形状不同。C 6分子在PS-基质的纳米颗粒中处于两种不同的微环境,所以发射峰较宽;PMMA是线性分子,PMMA-基质的纳米颗粒中只存在一种局域环境,所以发射峰较窄。高的掺杂浓度会超过纳米颗粒对C6分子的负载能力,从而导致C6分子在水溶液中聚集。
张玉巾彭洪尚黄世华由芳田
关键词:荧光浓度猝灭
Ultraviolet to near-infrared energy transfer in NaYF_4:Nd^(3+),Yb^(3+) crystals
2016年
To convert ultraviolet (UV) light into near-infrared (NIR) light in phosphors is demanded for the development of solar cells. A series of NaYF4:Nd3+,Yb3+ white powder samples were prepared via the hydrothermal method. The crystal structure and photolu-minescence properties of the samples were carefully studied using X-ray diffractometry (XRD) and photoluminescence spectra. The excitation and emission spectra of NaYF4:Nd3+,Yb3+ samples and the luminescence decay curves of Nd3+ and Yb3+ revealed an effi-cient energy transfer process from Nd3+ to Yb3+. This process resulted in the Yb3+ NIR fluorescent emission at 980 nm. Moreover, the lifetime of the Nd3+4F3/2 level decreased with the increase of Yb3+ doping concentration. The build-up time of the decay curves of the Yb3+2F5/2 level further verified the energy transfer process. Meanwhile, energy transfer efficiency based on different Yb3+ doping concentrations was achieved.
董晓斌由芳田彭洪尚黄世华
关键词:NIRNAYF4
GdBO_3∶Pr^(3+),Yb^(3+)中Pr^(3+)到Yb^(3+)的能量传递及发光性质被引量:5
2015年
采用高温固相法制备了一系列单掺或双掺Pr3+和Yb3+的GdBO3材料,分别测试分析了材料的物相结构和发光性质。在446 nm蓝光(Pr3+:3H4→3P2)激发下,检测到Yb3+的近红外特征发射,表明样品中存在Pr3+到Yb3+的能量传递。Pr3+的掺杂浓度一定时,样品的发光会随着Yb3+掺杂浓度的改变而发生变化。通过对比不同掺杂情况下Pr3+:3P0能级的衰减曲线,发现随着Yb3+的掺杂浓度的增加,该能级的荧光寿命不断缩短;同时利用不同条件下的衰减特性计算得出不同Yb3+掺杂浓度样品的能量传递效率。用InokutiHirayama模型分析表明Pr3+-Yb3+能量传递类型为偶极子-偶极子相互作用。
朱凡由芳田时秋峰彭洪尚黄世华
关键词:近红外发光稀土离子
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